100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS Page 451 InterviewSolution

22501.	The maximum angle to the horizontal at which a stone can be thrown so that it always moves away from the thrower will be :A. `sin^(-1)((sqrt(2))/(3))`B. `sin^(-1)((2sqrt(2))/(3))`C. `sin^(-1)((1)/(sqrt(3)))`D. `sin^(-1)(sqrt((2)/(3)))`
Answer» Correct Answer - B If stone always moves away from thrower then `rArr(d\|vecr\|)/(dt)gt0` `rArr(d\|vecr\|)/(dt)gt0` `rArrvecr.vecv gt 0 vecr=u costhetatveci+(u sinthetat-(1)/(2)g t^(2))hatj` `vecv=ucosthetahati+(usintheta-g t)hatj` `vecr.vecv=u^(2)t-(3)/(2)ug sin theta t^(2)+(g^(2))/(2)t^(3)gt0` `rArr (g^(2))/(2) t^(2)-(3)/(2) ug sintheta t+u^(2)gt0` `sin^(2)thetalt(8)/(9)rArrthetaltsin^(-1)((2sqrt(2))/(3))`

Discussion

22502.	How many ova will be produced by one full-grown primary oocyte?
Answer» The ova will be produced by one full-grown primary oocyte One ovum.

22502.

How many ova will be produced by one full-grown primary oocyte?

Answer»

The ova will be produced by one full-grown primary oocyte

One ovum.

Discussion

22503.	Answer the questions Observe the food web and answer the questions given below1. The mussel can be described as a) Producer b) Primary consumer c) Secondary consumer d) decomposer 2. Which trophic level is incorrectly defined? a) Carnivores – secondary or tertiary consumers b) Decomposers – microbial heterotrophs c) Herbivores – primary consumers d) Omnivores – molds, yeast and mushrooms 3. The given figure best represents :a) Grassland food chain b) Parasitic food chain c) Forest food chain d) Aquatic food chain4. Why do all food chains start with plants? a) Because plants are easily grown b) Because plants are nutritious c) Because plants can produce its own energyd) Because plants do not require energy5. In the food web, what two organisms are competing for food ?a) A and B b) D and Fc) A and C d) B and D
Answer» 1. c) Secondary consumer 2. d) Omnivores - molds, yeast and mushrooms 3. a) Grassland food chain 4. c) Because plants can produce its own energy 5. d) B and D 1. c) 2. d) 3. a) 4. c) 5. d)

22503.

Answer the questions Observe the food web and answer the questions given below1. The mussel can be described as a) Producer b) Primary consumer c) Secondary consumer d) decomposer 2. Which trophic level is incorrectly defined? a) Carnivores – secondary or tertiary consumers b) Decomposers – microbial heterotrophs c) Herbivores – primary consumers d) Omnivores – molds, yeast and mushrooms 3. The given figure best represents :a) Grassland food chain b) Parasitic food chain c) Forest food chain d) Aquatic food chain4. Why do all food chains start with plants? a) Because plants are easily grown b) Because plants are nutritious c) Because plants can produce its own energyd) Because plants do not require energy5. In the food web, what two organisms are competing for food ?a) A and B b) D and Fc) A and C d) B and D

Answer»

1. c) Secondary consumer

2. d) Omnivores - molds, yeast and mushrooms

3. a) Grassland food chain

4. c) Because plants can produce its own energy

5. d) B and D

1. c)

2. d)

3. a)

4. c)

5. d)

Discussion

22504.	Definition of environment science
Answer» Environmental studies deals with every issue that affects an organism. It is essentially a multidisciplinary approach that brings about an appreciation of our natural world and human impacts on its integrity. It is an applied science as its seeks practical answers to making human civilization sustainable on the earth’s finite resources. Its components include biology, geology, chemistry, physics, engineering, sociology, health, anthropology, economics, statistics, computers and philosophy

Discussion

22505.	Name the male and female reproductive part of a flower.
Answer» Male part – Androecium (Stamen) Female part- Gynoecium (Carpel or Pistil)

22505.

Name the male and female reproductive part of a flower.

Answer»

Male part – Androecium (Stamen)

Female part- Gynoecium (Carpel or Pistil)

Discussion

22506.	Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to (a) reduce its viscosity to permit easier processing (b) protect rubber goods from attack by oxygen & ozone present in the atmosphere (c) reduce the time of vulcanisation and quantity of vulcanising agent (d) increase its viscosity
Answer» (a) reduce its viscosity to permit easier processing

Discussion

22507.	Answer the questions Food chains are very important for the survival of most species. When only one element is removed from the food chain it can result in extinction of a species in some cases. The foundation of the food chain consists of primary producers. Primary producers, or autotrophs, can use either solar energy or chemical energy to create complex organic compounds, whereas species at higher trophic levels cannot and so must consume producers or other life that itself consumes producers. Because the sun's light is necessary for photosynthesis, most life could not exist if the sun disappeared. Even so, it has recently been discovered that there are some forms of life, chemotrophs, that appear to gain all their metabolic energy from chemosythesis driven by hydrothermal vents, thus showing that some life may not require solar energy to thrive.1. If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy? a) 10,000 J b) 100 J c) 1000 J d) It will depend on the type of the terrestrial plant.2. If Ravi is consuming curd/yogurt for lunch , which trophic level in a food chain he should be considered as occupying ? a) First trophic level b) Second trophic level c) Third trophic level d) Fourth trophic level3. The decomposers are not included in the food chain. The correct reason for the same is because decomposers: a) Act at every trophic level of the food chain b) Do not breakdown organic compounds c) Convert organic material to inorganic forms d) Release enzymes outside their body to convert organic material to inorganic forms4. Matter and energy are two fundamental inputs of an ecosystem. Movement of a) Energy is bidirectional and matter is repeatedly circulating. b) Energy is repeatedly circulation and matter is unidirectional. c) Energy is unidirectional and matter is repeatedly circulating. d) Energy is multidirectional and matter is bidirectional.5. Which of the following limits the number of trophic levels in a food chain? a) Decrease in energy at higher trophic levels b) Less availability of food c) Polluted air d) Water
Answer» 1. b) 100 J 2. c) Third Trophic level 3 a) Act at every trophic level of the food chain 4. c) Energy is unidirectional and matter is repeatedly circulating 5. a) Decrease in energy at higher trophic level

22507.

Answer the questions Food chains are very important for the survival of most species. When only one element is removed from the food chain it can result in extinction of a species in some cases. The foundation of the food chain consists of primary producers. Primary producers, or autotrophs, can use either solar energy or chemical energy to create complex organic compounds, whereas species at higher trophic levels cannot and so must consume producers or other life that itself consumes producers. Because the sun's light is necessary for photosynthesis, most life could not exist if the sun disappeared. Even so, it has recently been discovered that there are some forms of life, chemotrophs, that appear to gain all their metabolic energy from chemosythesis driven by hydrothermal vents, thus showing that some life may not require solar energy to thrive.1. If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy? a) 10,000 J b) 100 J c) 1000 J d) It will depend on the type of the terrestrial plant.2. If Ravi is consuming curd/yogurt for lunch , which trophic level in a food chain he should be considered as occupying ? a) First trophic level b) Second trophic level c) Third trophic level d) Fourth trophic level3. The decomposers are not included in the food chain. The correct reason for the same is because decomposers: a) Act at every trophic level of the food chain b) Do not breakdown organic compounds c) Convert organic material to inorganic forms d) Release enzymes outside their body to convert organic material to inorganic forms4. Matter and energy are two fundamental inputs of an ecosystem. Movement of a) Energy is bidirectional and matter is repeatedly circulating. b) Energy is repeatedly circulation and matter is unidirectional. c) Energy is unidirectional and matter is repeatedly circulating. d) Energy is multidirectional and matter is bidirectional.5. Which of the following limits the number of trophic levels in a food chain? a) Decrease in energy at higher trophic levels b) Less availability of food c) Polluted air d) Water

Answer»

1. b) 100 J

2. c) Third Trophic level

3 a) Act at every trophic level of the food chain

4. c) Energy is unidirectional and matter is repeatedly circulating

5. a) Decrease in energy at higher trophic level

Discussion

22508.	Structure of bainite is (a) Needle like (b) Feathery (c) Globular (d) Spherical
Answer» (b) Feathery

Discussion

22509.	Nose of a C-curve represents A. Shortest time required for specified fraction of transformation B. Longest time required for specified fraction of transformation C. Average time required for specified fraction of transformation D. No information regarding time required for specified fraction of transformation
Answer» A. Shortest time required for specified fraction of transformation

Discussion

22510.	Read the following and answer the questions from 1 to 5 that follow on the basis of information provided and studied concepts.A biogas plant is where biogas is produced by fermenting biomass.1. In which of the parts would you find anaerobic bacteria a) A b) B c) C d) D2. Which one of the following is NOT correct for biogas a) its carbon neutral b) its non-renewable c) it depends on micro-organisms d) yields rich manure3. Which of the following best indicates the steps of anaerobic digestion?a) Waste water feed → biogas storage → generator → biogas b) Waste water feed → digester → biogas → biogas storage → generator c) Generator → waste water feed → digester → biogas → biogas storage d) Waste water feed → biogas → digester → biogas storage → generator 4. Biogas is a better fuel than animal dung cake because a) Biogas is a renewable source of energy b) Animal dung cake has higher calorific value c) Biogas has high heating capacity d) Biogas burns without smoke. i. (a) onlyii. (b) only iii. (c) and (d) iv. (a) and (b) 5. Biogas is formed in the a) presence of air only b) presence of water only c) presence of air and absence of water d) presence of water and absence of air.
Answer» 1. b) B 2. b) its non-renewable 3. (b) Waste water feed → digester → biogas → biogas storage → generator 4. (c) (iii) and (iv) 5. (d) presence of water and absence of air

22510.

Read the following and answer the questions from 1 to 5 that follow on the basis of information provided and studied concepts.A biogas plant is where biogas is produced by fermenting biomass.1. In which of the parts would you find anaerobic bacteria a) A b) B c) C d) D2. Which one of the following is NOT correct for biogas a) its carbon neutral b) its non-renewable c) it depends on micro-organisms d) yields rich manure3. Which of the following best indicates the steps of anaerobic digestion?a) Waste water feed → biogas storage → generator → biogas b) Waste water feed → digester → biogas → biogas storage → generator c) Generator → waste water feed → digester → biogas → biogas storage d) Waste water feed → biogas → digester → biogas storage → generator 4. Biogas is a better fuel than animal dung cake because a) Biogas is a renewable source of energy b) Animal dung cake has higher calorific value c) Biogas has high heating capacity d) Biogas burns without smoke. i. (a) onlyii. (b) only iii. (c) and (d) iv. (a) and (b) 5. Biogas is formed in the a) presence of air only b) presence of water only c) presence of air and absence of water d) presence of water and absence of air.

Answer»

1. b) B

2. b) its non-renewable

3. (b) Waste water feed → digester → biogas → biogas storage → generator

4. (c) (iii) and (iv)

5. (d) presence of water and absence of air

Discussion

22511.	Phase formed of diffusion-less reaction: A. Pearlite B. Lower Bainite C. Upper bainite D. Martensite
Answer» D. Martensite

Discussion

22512.	In which of the following phases of steel cementite is in lamellar form? A. Ferrite B.Bainite C. Martensite D. Pearlite
Answer» In Pearlite phases of steel cementite is in lamellar form.

Discussion

22513.	Glucocorticoid hormones alter bone mineral homeostasis: a) By antagonizing vitamin D-stimulated intestinal calcium transport b) By stimulating renal calcium excretion c) By increasing parathyroid hormone stimulated bone resorption d) By all of the above
Answer» d) By all of the above

Discussion

22514.	Self-incompatibility is found in flowers of plants…..
Answer» Self-incompatibility is a widespread mechanism in flowering plants that prevents inbreeding and promotes outcrossing. The self-incompatibility response is genetically controlled by one or more multi-allelic loci, and relies on a series of complex cellular interactions between the self-incompatible pollen and pistil.

Discussion

22515.	In which of the following phases of steel cementite is in particle form?A. Martensite B. Ferrite C. Pearlite D.Bainite
Answer» In Bainite phases of steel cementite is in particle form.

Discussion

22516.	Indications for calcitonin administration are the following, EXCEPT: a) Hypercalcemia b) Paget's disease c) Hypophosphatemia d) Osteoporosis
Answer» c) Hypophosphatemia

Discussion

22517.	Mechanism of action of calcitonin is: a) Inhibits hydroxyapatite crystal formation, aggregation, and dissolution b) Raises intracellular cAMP in osteoclasts c) Activates bone resorption d) Inhibits macrophages
Answer» b) Raises intracellular cAMP in osteoclasts

Discussion

22518.	Which of the following statements about calcitonin is true: a) Calcitonin secreted by parafollicular cells of the mammalian thyroid is a single-chain peptide hormone with 32 amino acids b) Effects of calcitonin are to lower serum calcium and phosphate by acting on bones and kidneys. c) Calcitonin inhibits osteoclastic bone resorption. d) All of the above
Answer» d) All of the above

Discussion

22519.	Side effect of calcitonin is: a) Pruritus b) Hypotension c) Fractures d) Hypocalcemia
Answer» Side effect of calcitonin is Hypotension.

Discussion

22520.	‘‘Equality before law did not necessarily stand for universal suffrage in Europe.’’ Discuss.
Answer» The new middle class in Europe advocated the concept of liberalism emphasising the concept of freedom and equality for all. But at the same time, this was not visible in the political experiment around Europe. The right to vote was exclusively with the propertied class, that too only men. Women even with property rights were excluded from right to vote. The Jacobins who stood for revolution for equality were also biased on this issue. They too granted right to vote to all adult male population only. Napoleon who stood to end privileges too reduced women to the margin of the society with no political rights. For long did these women and non-propertied male struggled to win political rights for themselves.

22520.

‘‘Equality before law did not necessarily stand for universal suffrage in Europe.’’ Discuss.

Answer»

The new middle class in Europe advocated the concept of liberalism emphasising the concept of freedom and equality for all.

But at the same time, this was not visible in the political experiment around Europe. The right to vote was exclusively with the propertied class, that too only men. Women even with property rights were excluded from right to vote.

The Jacobins who stood for revolution for equality were also biased on this issue. They too granted right to vote to all adult male population only.

Napoleon who stood to end privileges too reduced women to the margin of the society with no political rights. For long did these women and non-propertied male struggled to win political rights for themselves.

Discussion

22521.	Define sport management
Answer» Sport management is the field of business that focuses directly on sports and recreation. Many different subjects are incorporated into sport management such as administration, finance, law and ethics. A degree in sport management can lead to career opportunities in the world of sports and recreation. Depending on what kind of sport management career interests you, possibilities include working directly with athletes, coaches and organizations or working behind the scenes as a promoter, marketing manager or sports economist. There are many different aspects of sport management. Sports finance is a billion dollar industry. Individuals who are interested in the financial and economic aspects of the world of sports might consider focusing their studies on finance and related subjects. Similarly, sport managers who want to work for international sports organizations should take courses like international marketing.

22521.

Define sport management

Answer»

Sport management is the field of business that focuses directly on sports and recreation. Many different subjects are incorporated into sport management such as administration, finance, law and ethics.

A degree in sport management can lead to career opportunities in the world of sports and recreation. Depending on what kind of sport management career interests you, possibilities include working directly with athletes, coaches and organizations or working behind the scenes as a promoter, marketing manager or sports economist.

There are many different aspects of sport management. Sports finance is a billion dollar industry. Individuals who are interested in the financial and economic aspects of the world of sports might consider focusing their studies on finance and related subjects. Similarly, sport managers who want to work for international sports organizations should take courses like international marketing.

Discussion

22522.	“There were two broad opinions on the new education policy introduced by the French in Vietnam”. Examine.
Answer» The following were the two broad opinions on the new education policy introduced by the French in Vietnam. (a) The French wanted to civilise the people of Vietnam. They also needed an educated labour force. So, they decided to introduce modern education. (b) At the same time, the question—How much?—haunted the French, as they feared that the educated Vietnamese would take away their jobs and may question or oppose colonial domination.

22522.

“There were two broad opinions on the new education policy introduced by the French in Vietnam”. Examine.

Answer»

The following were the two broad opinions on the new education policy introduced by the French in Vietnam.

(a) The French wanted to civilise the people of Vietnam. They also needed an educated labour force. So, they decided to introduce modern education.

(b) At the same time, the question—How much?—haunted the French, as they feared that the educated Vietnamese would take away their jobs and may question or oppose colonial domination.

Discussion

22523.	'Novelists like Charles Dickens, wrote about the terrible effects of industrialization on people's lives and characters'. Do you find something worth learning from the novel Hard Times by Charles Dickens.
Answer» (a) In the novel words like 'hands' for workers and 'Coketown' for fictitious industrial area kindled fire of protest in the workers. They could finally demand fixed working hours and higher wages for them. (b) The novel draws a grim picture of the workers. The readers could sympathise with them and help them organise themselves in a group and put forward their demands.

22523.

'Novelists like Charles Dickens, wrote about the terrible effects of industrialization on people's lives and characters'. Do you find something worth learning from the novel Hard Times by Charles Dickens.

Answer»

(a) In the novel words like 'hands' for workers and 'Coketown' for fictitious industrial area kindled fire of protest in the workers. They could finally demand fixed working hours and higher wages for them.

(b) The novel draws a grim picture of the workers. The readers could sympathise with them and help them organise themselves in a group and put forward their demands.

Discussion

22524.	An adverse drug reaction is different from a medication side effect in thata)An adverse effect has a greater possibility of causing harm.b)An adverse effect always happens,a side effect only happens every once a while.c) Adverse effects only occurs with injection,not with oral medication.d) there is no difference between an adverse effect and side effect.
Answer» The answer is b)An adverse effect always happens,a side effect only happens every once a while

Discussion

22525.	State Dobereiner law of triads giving examples.
Answer» It states that those triads in which the atomic weight of middle element was average of the atomic weight of first and third, such elements resemble the pysical and chemical properties, e.g. `{:(Li,Na,K),(7,(7+39)/2=23,39):}`

Discussion

22526.	What is meant by Newlands law of octaves?
Answer» It states if elements are arranged in increasing order of their atomic weights , properties of every `8th` element resemble the first element.

Discussion

22527.	Which of the following statements is true for lignocaine:A. It is an ester-linked local anaestheticB. It is not likely to exhibit cross-sensitivity with procaineC. It has a shorter duration of action than procaineD. It is not a surface anaesthetic
Answer» Answer: B. It is not likely to exhibit cross-sensitivity with procaine

Discussion

22528.	Diazepam is indicated in the following conditions except:A. Generalized tonic-clonic (grand mal) epilepsyB. TetanusC. Febrile convulsionsD. Cardiac catheterization
Answer» Answer: A. Generalized tonic-clonic (grand mal) epilepsy

Discussion

22529.	A mixture of two white substances was dissolved in water.On passing `Cl_2` gas through the solution a deep brown colour is developed. Addition of `BaCl_2` solution to the original solution gives a white precipitate.Addition of a large amount of NaOH solution to the original solution gives a white precipitate, whose suspension in water is used as an antacid.The mixture gives golden yellow colour flame. The mixture contains :A. `Na^(+), Mg^(2+) Br^(-) and SO_4^(2-)`B. `Na^(+), Ca^(2+) , Br^(-) and SO_4^(2-)`C. `Na^+ , Al^(3+) , Br^(-) and SO_4^(2-)`D. `Na^(+),Zm^(2+) , Br^(-) and SO_4^(2-)`
Answer» Correct Answer - A `2Br^(-)+Cl_2toBr_2uarr`(reddish brown) + `2Cl^(-) , SO_4^(2-)+BaCl_2toBaSO_4 darr`(white)+`2Cl^-` `Mg^(2+)+2NaOH to Mg(OH)_2darr` (white) + `2Na^+` Suspension of `Mg(OH)_2` in water is used as antacid & sodium salt give golden yellow colour flame.

Discussion

22530.	`K_4[Fe(CN)_6]` can be used to detect one or more out of `Fe^(2+),Fe^(3+),Zn^(2+),Ca^(2+)`:A. `Fe^(2+),Fe^(3+)` onlyB. `Fe^(3+), Zn^(2+), Cu^(2+)` onlyC. All but not `Ca^(2+)`D. All
Answer» Correct Answer - D `Fe^(2+)+2K^(+)[Fe(CN)_6]darr` (white) (in absence of air) `Fe^(3+)+[Fe(CN)_6]^(4-)toFe_4[Fe(CN)_6]_3`(prussian blue precipitate or solution) `Zn^(2+)+2K^(+)[Fe(CN)_6]^(4-)`(excess)`toK_2Zn_3[Fe(CN)_6]_2darr`(bluish -white/white) `Ca^(2+)+2K^(+)[Fe(CN)_6]^(4-)toK_2Ca[Fe(CN)_6]darr`(white) `Cu^(+)+2K^(+)+[Fe(CN)_6]^(4-)toCu_2[Fe(CN)_6]darr` [chocolate brown]

Discussion

22531.	What is the `EMF` of a cell?
Answer» The difference between the electrode potential of two half cells is called the `EMF` of a cell.

Discussion

22532.	Why a cell stops working after some time ?
Answer» With time, the concentration of the electrolyte solution change. Hence, their electrode potentials change. When the electrode potentials of the two half `-` cells become equal, the cell stops working.

Discussion

22533.	Why Sulphur is paramagnetic in vapour state?
Answer» In vapour state, Sulphur partly exists as S₂molecule, which has two unpaired electrons in antibinding pie orbitals, just like the O₂ molecule. Hence, it exhibits paramagnetism.

Discussion

22534.	What is electrochemical equivalent of a substance ?
Answer» Amount of a subtance deposited by 1 coulomb is called electrochemical equivalent of the substance. One coulomb deposits `=(Ew)/(96500)g`

Discussion

22535.	An aqueous solution of `CuSO_(4)` is electrolyszed using `Pt` electrodes in one case and `Cu` electrodes in another case. What are the products of electrolysis in both the cases ?
Answer» `a.` When `Pt` electrodes are used `:` At anode `:H_(2)O rarr 2H^(o+)+(1)/(2)O_(2)+2e^(-)` [Since oxidation potential of `H_(2)O gt` oxidation potential of `SO_(4)^(2-) "ion"]` At cathode `:Cu^(2+)+2e^(-) rarr Cu` ( Since reduction potential of `Cu gt` reduction potential of `H_(2)O)`. `b.` When `Cu` electrode are used `:` At anode `:Cu` dissolves into solution to form `Cu^(2+)` ions. At cathode `:Cu` is depostited as cathdoe. Since both the reduction and oxidation potential of `Cu^(2+)` and `Cu` is greater than that of `H_(2)O`.

Discussion

22536.	What are the products of the electrolysis of aqueous solution of `KF` ?
Answer» `O_(2)` and `H_(2)` at anode and cathode, respectively. Since the oxidation potential of `H_(2)Ogt ` oxidation potential of `F^(c-)`, Similarly, the reduction potential of `H_(2)Ogt` reduction potential of `K^(o+)`.

Discussion

22537.	Why `Zn` reacts with dilute `H_(2)SO_(4)` to give `H_(2)` gas but `Cu` does not ?
Answer» `Zn` has higher oxidation potential than hydrogen whereas `Cu` has lower oxidation potential than hydrogen.

Discussion

22538.	Silver is conducting as such while `AgNO_(3)` is conducting in molten state or in aqueous solution. Explain ?
Answer» `Ag` is conducting as such because it contains free electrons while `AgNO_(3)` is conducting in molten or in aqueous solution because ions are produced in molten or in aqueous solution.

Discussion

22539.	The most reactive of the following towards electrophilic substitution reaction is A. IB. IIC. IIID. IV
Answer» Correct Answer - B `-CF_3` is deactivating group while `-CH_3` are activating groups. Methoxy group is stronger activating group than `-CH_3` because `-OCH_3` group is stornger electron releasing group due to resonance while `-CH_3` has weaker `+I` effect.

Discussion

22540.	Phentole reacts with HI to giveA. iodobezene and ethanolB. phenol ethyl iodideC. ethyl iodide and benzeneD. all of these
Answer» Correct Answer - B `(CH_3)_3C-CH_2Br` (Neophentyl bromide) is most sterically hindered alkyl halide and hence least reacitve.

Discussion

22541.	Which of the following alkyl halides is least reactive in the Willamson synthesis of ether ?A. `CH_3CH_2CH_2Br`B. `CH_3CH_2CH_2CI`C. `(CH_(3))_(3)CCH_2Br`D. `CH_2=CH-CH_2CI`
Answer» Correct Answer - C Diethyl ehter is almost insoluble in water.

Discussion

22542.	Strongest base is :A. B. C. D.
Answer» Correct Answer - A

Discussion

22543.	The order of reactivity of the following alcohols towards conc. HCl is(a) I > II > III > IV (b) I > III > II > IV(c) IV > III > II > I (d) IV > III > I > II
Answer» (c) IV > III > II > I

Discussion

22544.	The order of reactivity of following alcohols, towards conc. HCl is : A. `IgtIIgtIIIgtIV`B. `IgtIIIgtIIgtIV`C. `IVgtIIIgtIIgtI`D. `IVgtIIIgtIgtII`
Answer» Correct Answer - C

Discussion

22545.	On icreasing temperature from `200 K` to `220 K` rate of reaction A increases by `3` times and rate of reaction B increases by `9` times then correct relationship between activation energy of A and B isA. `E_(A) = 3 E_(B)`B. `3 E_(A) = E_(B)`C. `E_(B) = 2E_(A)`D. `E_(A) = 2E_(B)`
Answer» Correct Answer - C For a reaction `A rarr P` `In (k_(2))/(k_(1)) = (E_(A))/(R ) [1/200 - 1/220] = In 3` `In (k_(2))/(k_(1)) = (E_(B))/(R ) [1/200 -1/220] = In 9` `(In3)/(In3^(2)) = (E_(A))/(E_(B)) rArr 2E_(A) = E_(B)`

Discussion

22546.	Calculate the degree og ionisation of `0.04 M HOCl` solution having ionisation constant `1.25 xx 10^(-4)` ?A. `0.025`B. `0.5`C. `0.25`D. `0.055`
Answer» Correct Answer - D `{:(HOCl,hArr,OH^(+),+,Cl^(+),),(C,,,,,),(C (a - alpha),,C alpha,,C alpha,):}` `K_(a) = (c alpha^(2))/(1 - alpha) = (0.04 xx alpha^(2))/(1 - alpha) " " [{:("As",,alpha lt lt lt 1),(because,,1-alpha=1):}]` `1.25 xx 10^(-4) = 0.04 alpha^(2)` `alpha^(2) = (1.25 xx 10^(-4))/(0.04) = (125 xx 10^(-4))/(4)` `alpha = (11)/(2) xx 10^(-2) = (0.11)/(2) = 0.055`

Discussion

22547.	In a crystalline solid, X atoms occupy hcp and `1//4` th of tetrahedral coids are occupied by Y atoms. Then empirical formula of crystalline solid isA. `X_(2)Y`B. `XY_(2)`C. `X_(4)Y`D. `XY`
Answer» Correct Answer - A `X rarr 12 xx (1)/(6) + 3 + 2 xx (1)/(2) = 6` `Y = 12 xx (1)/(4) = 3 X_(6)Y_(3) rArr X_(2) Y`

Discussion

22548.	(I) Lithium forms monoxide with oxygen whereas sodium forms peroxide with oxygen. Why? (II) Write about the uses of strontium?
Answer» (I) 1. The fact that a small cation can stabilize a small anion and a large cation can stabilize a large anion explains the formation and stability of the oxides. 2. The size of Li⁺ ion is very small and it has a strong positive field around it. It can combine . with only small anion, O^2- ion, resulting in the formation of monoxide Li₂O. 3. The Na⁺ ion is a larger cation and has a weak positive field around it and can stabilize a bigger peroxide ion, \(O^{2-}_2\) or [-O-O-]^2- resulting in the formation of peroxide Na₂O₂. (II) 1. 90Sr is used in cancer therapy. 2. ⁸⁷Sr/⁸⁶Sr ratio is used in marine investigators as well as in teeth, tracking animal migrations or in criminal forensics. 3. Dating of rocks. 4. Strontium is used as a radioactive tracer in determining the ‘source of archaeological materials ’ such as timbers and coins.

22548.

(I) Lithium forms monoxide with oxygen whereas sodium forms peroxide with oxygen. Why? (II) Write about the uses of strontium?

Answer»

(I)

1. The fact that a small cation can stabilize a small anion and a large cation can stabilize a large anion explains the formation and stability of the oxides.

2. The size of Li⁺ ion is very small and it has a strong positive field around it. It can combine . with only small anion, O^2- ion, resulting in the formation of monoxide Li₂O.

3. The Na⁺ ion is a larger cation and has a weak positive field around it and can stabilize a bigger peroxide ion,

\(O^{2-}_2\) or [-O-O-]^2- resulting in the formation of peroxide Na₂O₂.

(II)

1. 90Sr is used in cancer therapy.

2. ⁸⁷Sr/⁸⁶Sr ratio is used in marine investigators as well as in teeth, tracking animal migrations or in criminal forensics.

3. Dating of rocks.

4. Strontium is used as a radioactive tracer in determining the ‘source of archaeological materials ’ such as timbers and coins.

Discussion

22549.	(I) Discuss the three types of Covalent hydrides? (II) Write the chemical reactions to show the amphoteric nature of water?
Answer» (I) 1. They are the compounds in which hydrogen is attached to another element by sharing of electrons. 2. The most common examples of covalent hydrides are methane, ammonia, waterand hydrogen chloride. 3. Molecular hydrides of hydrogen are further classified into three categories as, Electron precise (CH₄, C₂H₆, SiH₄, GeH₄ ) Electron-deficient (B₂H₆) and Electron-rich hydrides (NH₃, H₂O) 4. Since most of the covalent hydrides consist of discrete, small molecules that have relatively weak intermolecular forces, they are generally gases or volatile liquids. (II) Water is amphotenc in nature and it behaves both as an acid as well as base. With acids stronger than itself (e.g., H₂S) it behaves as a base and with bases stronger than itself (e.g., NH₃) it acts as an acid. 1. As a base: H₂O_(l) + H₂S_(aq) → H₃O_(aq) – HS^-_(aq) 2. As a acid: H₂O(l) + NH_3(aq) → OH^-_(aq) + NH⁺

22549.

(I) Discuss the three types of Covalent hydrides? (II) Write the chemical reactions to show the amphoteric nature of water?

Answer»

(I)

1. They are the compounds in which hydrogen is attached to another element by sharing of electrons.

2. The most common examples of covalent hydrides are methane, ammonia, waterand hydrogen chloride.

3. Molecular hydrides of hydrogen are further classified into three categories as,

Electron precise (CH₄, C₂H₆, SiH₄, GeH₄ )
Electron-deficient (B₂H₆) and
Electron-rich hydrides (NH₃, H₂O)

4. Since most of the covalent hydrides consist of discrete, small molecules that have relatively weak intermolecular forces, they are generally gases or volatile liquids.

(II) Water is amphotenc in nature and it behaves both as an acid as well as base. With acids stronger than itself (e.g., H₂S) it behaves as a base and with bases stronger than itself (e.g., NH₃) it acts as an acid.

1. As a base:

H₂O_(l) + H₂S_(aq) → H₃O_(aq) – HS^-_(aq)

2. As a acid:

H₂O(l) + NH_3(aq) → OH^-_(aq) + NH⁺

Discussion

22550.	(I) What is the difference between molecular mass and molar mass? Calculate the molecular mass and molar mass for carbon monoxide. (II) What are competitive electron transfer reaction? Give example
Answer» (I) Molecular mass: 1. Relative molecular mass is defined as the ratio of the mass of the molecule to the unified atomic mass unit. 2. It can be calculated by adding the relative atomic masses of its constituent atoms. 3. For carbon monoxide (CO) Molecular mass = Atomic mass of carbon + Atomic mass of oxygen 12 + 16 = 28 u. Molar mass: 1. It is defined as the mass of one mole of a substance. 2. The molar mass of a compound is equal to the sum of the relative atomic masses of its constituent expressed in g mol . 3. For carbon monoxide (CO) 12 + 16 = 28 g mol^-1. Both molecular mass and molar mass are numerically same but the units are different. (II) These are the reactions in which redox reactions take place in different vessels and it is an indirect redox reaction. There is a competition for the release of electrons among different metals. Example: Zn releases electrons to Cu and Cu releases electrons to Silver and so on. Zn_(s) + Cu²⁺ → Zn²⁺ + Cu_(s) (Here Zn – oxidised; Cu²⁺ – reduced) Cu_(s)+ 2Ag⁺ → Cu²⁺_(aq) + 2Ag_(s) (Here Cu – oxidised; Ag⁺ – reduced)

22550.

(I) What is the difference between molecular mass and molar mass? Calculate the molecular mass and molar mass for carbon monoxide. (II) What are competitive electron transfer reaction? Give example

Answer»

(I) Molecular mass:

1. Relative molecular mass is defined as the ratio of the mass of the molecule to the unified atomic mass unit.

2. It can be calculated by adding the relative atomic masses of its constituent atoms.

3. For carbon monoxide (CO)

Molecular mass = Atomic mass of carbon + Atomic mass of oxygen 12 + 16 = 28 u.

Molar mass:

1. It is defined as the mass of one mole of a substance.

2. The molar mass of a compound is equal to the sum of the relative atomic masses of its constituent expressed in g mol .

3. For carbon monoxide (CO)

12 + 16 = 28 g mol^-1.

Both molecular mass and molar mass are numerically same but the units are different.

(II) These are the reactions in which redox reactions take place in different vessels and it is an indirect redox reaction. There is a competition for the release of electrons among different metals.

Example:

Zn releases electrons to Cu and Cu releases electrons to Silver and so on.

Zn_(s) + Cu²⁺ → Zn²⁺ + Cu_(s) (Here Zn – oxidised; Cu²⁺ – reduced)

Cu_(s)+ 2Ag⁺ → Cu²⁺_(aq) + 2Ag_(s) (Here Cu – oxidised; Ag⁺ – reduced)

Discussion

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