Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Can you give some more examples where energy or fuel resources are misused in our daily life?

Answer»

of Energy or Fuel ResourcesMisuse of energy or fuel resources is quite PREVALENT in our country. PEOPLE are not at all frugal in USING energy and fuel resources. The most glaring misuse of fuel and energy resources is done by people having vehicles. For even most insignificant errands, they use either bike or car, thus leading to wastage. Young lads and girls also waste fuel by purposelessly GOING from one place to another on their vehicles.  Energy is also misused in watching TV and gadgets unnecessarily by younger generation. People don’t have the habit of switching off LIGHTS and gadgets running for no purpose. Lots and lots of energy is wasted on celebrations of festivals, weddings, partying etc.  We should be very wise and frugal in using energy and fuel. They not only cause pollution, but also drain our national income as much of fuel is imported from other countries.    Mark me as brainliest if you like plzzzzz..

2.

Convert Methyl alcohol to Methyl iodide.

Answer»

ear,● Methyl alcohol to methyl iodide -Methyl alcohol is treated with excess of hydroiodic acid to methyl iodide.CH3-OH + HI --> CH3-I + H2OThe reaction is nucleophilic substitution reaction with SN2 mechanism. If limited amt of HI is used, some of CH3-I is reverted back to CH3-OH.Hope this helped to SOLVE your QUERY.

3.

Symbol of first 60 element

Answer»

rogen 1, 0, -12 He Helium 03 Li Lithium 1, -14 Be Beryllium 25 B Boron 3, 2, 16 C Carbon 4, 3, 2, 1, -1, -2, -47 N Nitrogen 5, 4, 3, 2, 1, 0, -1, -2, -38 O Oxygen 2, 1, 0, -1, -29 F Fluorine 0, -110 NE Neon 011 Na Sodium 1, -112 Mg MAGNESIUM 213 Al Aluminum 3, 114 Si Silicon 4, 3, 2, 1, -1, -2, -415 P Phosphorus 5, 4, 3, 2, 1, 0, -1, -2, -316 S Sulfur 6, 5, 4, 3, 2, 1, 0, -1, -217 Cl Chlorine 6, 5, 4, 3, 2, 1, 0, -1, -218 Ar Argon 019 K Potassium 1, -120 Ca Calcium 221 SC Scandium 3, 2, 122 Ti Titanium 4, 3, 2, 0, -1, -223 V Vanadium 5, 4, 3, 2, 1, 0, -1, -224 Cr Chromium 6, 5, 4, 3, 2, 1, 0, -1, -2, -3, -425 Mn Manganese 7, 6, 5, 4, 3, 2, 1, 0, -1, -2, -326 Fe Iron 6, 5, 4, 3, 2, 1, 0, -1, -227 Co Cobalt 5, 4, 3, 2, 1, 0, -128 Ni Nickel 6, 4, 3, 2, 1, 0, -129 Cu Copper 4, 3, 2, 1, 030 Zn Zinc 2, 1, 031 Ga Gallium 3, 2, 132 Ge Germanium 4, 3, 2, 133 As Arsenic 5, 3, 2, -334 Se Selenium 6, 4, 2, 1, -235 Br Bromine 7, 5, 4, 3, 1, 0, -136 Kr Krypton 2, 037 Rb Rubidium 1, -138 Sr Strontium 239 Y Yttrium 3, 240 Zr Zirconium 4, 3, 2, 1, 0, -241 Nb Niobium 5, 4, 3, 2, 1, 0, -1, -342 Mo Molybdenum 6, 5, 4, 3, 2, 1, 0, -1, -243 Tc Technetium 7, 6, 5, 4, 3, 2, 1, 0, -1, -344 Ru Ruthenium 8, 7, 6, 5, 4, 3, 2, 1, 0, -245 Rh Rhodium 6, 5, 4, 3, 2, 1, 0, -146 Pd Palladium 4, 2, 047 Ag Silver 3, 2, 1, 048 Cd Cadmium 2, 149 In Indium 3, 2, 150 Sn Tin 4, 2, -451 Sb Antimony 5, 3, -352 Te Tellurium 6, 5, 4, 2, 1, -253 I Iodine 7, 5, 3, 1, 0, -154 Xe Xenon 8, 6, 4, 3, 2, 055 Cs Cesium 1, -156 Ba Barium 257 La Lanthanum 3, 258 CE Cerium 4, 3, 259 Pr Praseodymium 4, 3, 260 Nd Neodymium 4, 3, 2

4.

Methods to convert temporary hard water into soft water

Answer» OILING 2. by CLARK's METHOD
5.

How is borax prepare write two uses of borax

Answer»

r HealthThis can include uses for a borax powder to improve the health of plants and animals.Used as a solution to promote fruit and seed development for fruit TREES. Just sprinkle the borax powder into, SAY, a full-grown apple tree every 3 to 4 years. The borax solution will add boron to the soil.With the help of borax, freshly-cut flowers can be preserved for an extended period of time.Sprinkle sodium borate powder on the floor to get rid of mice.Borax can be used to combat bugs including ants, FLEAS, COCKROACHES, and other pests. Just sprinkle equal parts of borax and sugar to the area where you think these ants and fleas are present.

6.

Define with example chemical equation and chemical formula

Answer»

l equation -A CHEMICAL equation is a short-hand way to represent the components of a chemical reaction.ex: C +O_{2} =CO_{2}chemical formula-  A chemical formula tells US the number of atoms of each element in a compoundex: NaHCo_{3}hope this will HELP u:-)plzz MARK me as brainliest

7.

Note the colour of the gas evolved on heating ferrous sulphate

Answer» ING the COLOUR changes from light green to white.On further heating the white substance changes to DARK brown solid
8.

Which colour is observed in the solution when groundnut oil is mixed with potassium permanganate

Answer»

(Arachis hypogaea L.) oil from seeds of six varieties; boro red, boro light, mokwa, ela, campala and guta as well as oil from three geographical zones in Nigeria; northern, eastern and western were investigated. Gas chromatography analysis showed high concentrations of oleic and linoleic acids in the oil samples. CAPRIC (0.0%) and LAURIC (8.1%) acids were absent and highest, RESPECTIVELY in the mokwa variety and hence diagnostic. More so, the COMPARATIVE chemical analysis of peanut oil from the three zones and some selected refined vegetable oil; sunola, grand, olive and corn oil, indicated that western and grand oil had high iodine value 1.74±0.1 and 2.63±0.1, respectively, compared to others. The northern oil had high acid and fat value than the others (4.49 and 133%, respectively). Furthermore, the saponification value of the local vegetable oil was found to be significantly higher than the refined vegetable oil (P < 0.05), the eastern oil having the highest (140.25mgKOH/g). However, the PEROXIDE values for both the local and refined oil were less than the standard peroxide value (10mEqKg-1) for vegetable oil deterioration. Minerals were present and no rancidity was observed in all the samples. In conclusion, the groundnut oil from Nigeria may have a higher shelf life, and serve as a useful substitute in nutrition and industrial applications.

9.

friends. i,'m in11. calculate. the. ph. of. a. 0.01M. acetic. acid. solution. with. the. degree. of. ionization0.045

Answer» FORMULAE: PKA = -㏒[KA]                                  GIVEN,pka = -㏒[0.045]                                                 ka=0.045        =1.347
10.

Physical properties of carbon compounds

Answer»

l properties of CARBON compounds or ORGANIC compounds: Carbon compounds have low melting and boiling POINTS because force of attraction between their molecules are not very STRONG. Carbon compounds are non- conductors of electricity because they do not CONTAINS ionsi hope it helps uh ✌️✌️

11.

How are bases different from alkalis ? are all bases alkalis

Answer» HAT are soluble in water are called ALKALIS. All BASES are not soluble in waterAll Alkalis are BASE but not all bases are not alkalis
12.

explain why carbon forms compounds mainly by covalent bond explain in brief two main reasons for Carbon forming a large number of compounds.why does carbon form strong bonds with most other elements

Answer» FORMS Covalent Bond because of its TETRA VALANCY.Tetra valancy : An element having 4 valancy.And there are large number of carbon compound because of TWO reasons -1. Tetra Valancy2. Catination - Ability to FORM long carbon chains. HOPE U UNDERSTAND IT
13.

How will you obtain clear water from muddy water

Answer»

the water you would need to place the muddy water in a SEALED container with a spout at the top. ATTACH ONE END of a hose to the spout and put the other end in a glass. When you put a heat source below the container with the mud, the water will begin to boil and evaporate.OrClear water can be obtained from a sample of muddy water by the method of filtration. In this method, the sample of muddy water is POURED through a cloth ( Tissue Paper).

14.

Explain the trends of alkali metal

Answer»

you're answer ⤵⤵⤵Describe and explain the trend in reactivity down the ALKALI metalsgroup. This is because the OUTER electron in each atom is further away from the NUCLEUS as you go down the group and so the electrostatic forces between the nucleus and the outer electron are weaker.hope its help # be brainly LOVE you

15.

Blood and heamoglobin are positive or negative nature?

Answer»

obin is POSITIVE

16.

73g of conc.HCL was diluted by adding 144g of water.How many gram atom of hydrogen are present in the dilute acid?Please solve it fast

Answer»

udent,◆ Answer -Moles of hydrogen = 18 gram-atoms● Explaination -Moles of HCl are -n(HCl) = W(HCl) / M(HCl)n(HCl) = 73/36.5n(HCl) = 2 molMoles of H-atoms in HCl is -n1 = 1 × 2n1 = 2 molMoles of H2O are -n(H2O) = W(H2O) / M(H2O)n(H2O) = 144/18n(H2O) = 8 molMoles of H-atoms in H2O is -n1 = 2 × 8n1 = 16 molTotal moles of H-atoms is -n = n1 + n2n = 2 + 16n = 18 molTherefore, 18 gram atoms hydrogen are PRESENT in dilute acid.Thanks dear. Hope this helps you...

17.

What could be the nature of A – B bond, if the electronegativities of A, B are 3.5 and 2.5 respectively?

Answer»

The “electro negativities” of “A” and “B” are GIVEN as 3.5 and 2.5 The “nature of the BOND” formed between A-B is to be found The difference in electro NEGATIVE VALUES of A and B = 3.5 - 2.5 = 1 The BONDS with the electro negative values less than 1.6 are considered to be polar. Since, the difference value is 1, the nature of A-B Bond is polar.

18.

What do you mean by the term ‘Formality’ ? To what type of compounds it is applied?

Answer»

ty definition Formality is the “number of gram” formula “weight” per “volume of solute” in “one LITER” of SOLUTION. The “solution” is said to be formal solution by below formula with its formality is EQUAL to one. The TERM formality is mainly applicable to the “ionic COMPOUNDS” or “weak electrolytes”.

19.

What are the harmful effects of pollution?

Answer»

s an irritant gas, which combines with air to FORM NO which is not considered as hazards to human HEALTH. The NO gas reacts with smog to create acid rains. The main source of is the reaction between Nitrogen and oxygen at higher temperature and in urban areas from the vehicles smoke such as cars and bikes. ii) It causes some respiratory problems to human beings. iii) long term exposure of NO gas decreases lung functions, creates respiratory problems and certain allergies. IV) In vegetation, the NO gas damages the leaf growth v) It also reacts with ATMOSPHERE POLLUTANTS in presence of sunlight to form ozone which creates major problems in vegetation and humans.

20.

Calculate the wavelength of an electron moving with a velocity of .

Answer»

ng to de Broglie, every microscopic particle has both wave nature and particle nature (DUAL nature of matter). In order to calculate the WAVELENGTH of the ELECTRON which is moving with a certain velocity, we NEED to calculate the de Broglie wavelength of the electron. The mass of the electron is , we should use the FOLLOWING equation, λ =λ = λ =0.355A°

21.

What are the basic units of layer structure of orthoboric acid? How are they bonded to one another?

Answer»

cid has a LAYER STRUCTURE as follows:i) The BASIC unit of which is linked through HYDROGEN bonds.ii) has layer structure with PLANAR trigonal hydrogen atoms to form a covalent bond with one unit and hydrogen bond with another unit.

22.

Calculate the vapour density of a gas, 12.8g of which occupies 10L at a pressure of 750 mm at 27°C.

Answer»

r to calculate the vapour density of any gas, we need its MOLAR MASS. According to the question, the weight of the gases, pressure and temperature is also given, we need to calculate the number of moles of the given gas USING the ideal gas EQUATION,                                                     PV = nRT The number of moles is calculated and the weight of the given gas is used therefore, we can calculate the MOLECULAR mass.   molecular mass                                                       PV=nRT 0.4 moles = 12.8g 1mole = 32g 2(VD) = molar mass Vapour density, VD=

23.

What are smogs ? How classical and photochemical smogs different ?

Answer»

og” is a “mixture” of “smoke” and “FOG”. There are “two types” of smog i) “CLASSICAL smog” and ii) “photochemical smog”Classical smog:i)        It is formed by the reaction of humidity and PRESENT in the airii)        It is formed during winter days in the morning while the temperature is very lowiii)        It is reducing in character and produces lung cancerPhotochemical smog:i)        It is formed as a “result” of photochemical reaction. When air contains and hydrocarbonii)        It is formed during summer days in the bright sunlight when temperature is highiii)        It is oxidizing in character and IRRITATE EYES

24.

Why is stored in carbon dioxide atmosphere ?

Answer»

stored in carbon dioxide atmosphere because under normal atmospheric condition the beryllium CARBONATE readily decomposes into TWO PRODUCTS namely Beryllium oxide and Carbon di oxide. When the is placed in the atmosphere which is rich in carbon dioxide, the released carbon dioxide INTERACTS with the atmospheric carbon dioxide and EQUILIBRIUM is attained and stability is maintained. Hence, it can be inferred that in order to “prevent decomposition”, is stored in carbon dioxide atmosphere.

25.

Calculate the volume occupied by 8.8 g of CO2 at 31.1°C and 1 bar pressure. R = 0.083 bar L .

Answer» E given question, in order to calculate the volume occupied by CARBON dioxide, we need to use the ideal gas equation. In the ideal gas equation, we need to substitute the number of moles of carbon dioxide which could be calculated from the given weight of carbon dioxide which is 8.8 g, the given pressure is 1 bar and the gas is at a TEMPERATURE 0˚C which again needs to be CONVERTED into Kelvin(k). The volume of carbon dioxide at a given conditions can be calculated as follows ,                                                    PV=nRT        V = 5.048 bar
26.

Why in case of hydrogen and helium the compressibility factor is always greater than 1?

Answer»

he MATTER of fact that due to pV = nRT, the compressibility factor of all ideal gases are equal to 1 as they have strong dipole due to large surface area. But in case of hydrogen and helium, this is false because they are CONSIDERED as nearly ideal gases. The attractive forces EXISTING among them is vanderwalls FORCE which is ALSO weak due to less surface area as the size of these atoms are very small. Hence, it can be inferred that case of hydrogen and helium the compressibility factor is always greater than 1.

27.

Why does elemental hydrogen react with other substances slowly at room temperature?

Answer»

t help you:-) hydrogen react with other substances slowly in temperature because the number of shell having OUTER most electron in hydrogen is L so gap between the NUCLEUS in the atom is very SMALL then so nucleus exert more POWER to Valence ELECTRONS and not allow to loose it easily but to react with other substances it must looses.Please mark as brainiest

28.

Why does hydrazine not give test for Lassaigne’s extract?

Answer» ORGANIC compound to SHOW positive result for LASSAIGNE's TEST it must be composed of carbon. If carbon is absent in an organic compound it does not show positive result for Lassaigne's test. Hydrazine is an organic compound composed of elements nitrogen and hydrogen. When this compound is treated with Lassaigne's reagent due to ABSENCE of carbon it does not leads to the formation of NaCN, the primary driver of the test.
29.

Why gas is not found in earth's atmosphere?

Answer»

en” is the most copious element situated in the universe. It comprises about 70% of the “total mass” of the universe and is the most notable element in solar atmosphere. It is ALSO PRESENT in higher CONCENTRATION in planets such as “Jupiter” and “Saturn”. The most unfortunate fate of hydrogen is that due to its “light WEIGHT” and nature, it is present in the earth atmosphere in trace quantity. It is present in atmosphere about “0.15%” by mass.

30.

Which p- block elements exist as liquid at room temperature?

Answer»

y liquid elements at standard temperature and pressure are BROMINE (BR) and mercury (HG). Although, elements caesium (Cs), rubidium (Rb), FRANCIUM (Fr) and Gallium (Ga) BECOME liquid at or just above room temperature.

31.

Which gaseous species are present in the mesosphere and thermosphere?

Answer»

sosphere” is one of the layers of Earth's atmosphere. The mesosphere is over the layer called “stratosphere”. The layer over the mesosphere is TERMED as the thermosphere. The REGION of mesosphere commences at “50 km” (“31 MILES”) over Earth's surface and ends up to “85 km” (“53 miles”) high. Gaseous species such as atomic oxygen and NITROGEN, MOLECULAR oxygen and nitrogen, helium and hydrogen are present in the mesosphere and thermosphere.

32.

Which element is used as a standard for comparing atomic and molecular masses?

Answer»

is used as a standard for comparing atomic and molecular masses. At first, researchers acquired the nuclear masses of the considerable number of COMPONENTS by comparing it with the mass of hydrogen which is taken as 1. In all the CASES, the ISSUE was that the nuclear masses of the majority of the components turned out to be fractions. When the same procedure was repeated with carbon standard values were obtained.  In this manner, “carbon” is considered as the reference for standard for comparing atomic and molecular masses.

33.

When moving with the same velocity which one of the following particles has the largest de Broglie wavelength and why? (a) Electron (b) Proton (c) α-particle.

Answer»

ving with the “same velocity” electron has the largest de Broglie wavelength. It is because, de-Broglie equation STATES that wavelength of the particle is “inversely PROPORTIONAL” to its MASS. The mass of electron, proton, and neutron are 0.00054, 1.00727, and 1.00867 respectively. When the mass of all the three particles is compared, the particle with less mass is electron. THUS, less mass means more wavelengths. Hence, it can be inferred that electron has the “largest” “de Broglie wavelength”.

34.

Plzz fast it's urgenttoday I have exam

Answer» UPAC NAME of these REACTIONANSWER the QUESTION
35.

What type of radiations are absorbed by in the atmosphere?

Answer»

dioxide is CONSIDERED as “one of the most” notable CAUSATIVE agent of greenhouse effect.  Once, it REACHES the atmosphere, it is very difficult to reduce its level as it has strong affinity to the atmosphere layer of the earth. In the earth's atmosphere, the carbon dioxide GAS has the ability to absorb the radiation with wavelength of 15 μm (micrometers). Due to this affinity of the carbon dioxide as the infra RED rays fall under the prescribed wavelength for carbon dioxide affinity, IR radiations are absorbed by it.

36.

What type of aromatic compounds are present as particulates in the air?

Answer»

ments are present as minute particles in air. Polycyclic aromatic HYDROCARBONS (PAH) are released by the inadequate burning of oil, petroleum, coal, wood, TOBACCO, charbroiled meats, rubbish, or other natural materials. The “vast majority” of them have no known use. A couple is utilized in DRUGS, and to MAKE colors, plastics, and pesticides. Naphthalene, otherwise called mothballs, is utilized in making colors, explosives, plastics, greases, and moth repellent. Anthracene is utilized in colors, bug sprays and wood additives.

37.

Calculate the volume at STP occupied by: (a) 14 g of nitrogen. (b) 1.5 moles of carbon dioxide. (c) molecules of oxygen.

Answer»

e given question, in order to calculate the volume at STP, first need to identify the CONDITIONS of pressure and temperature at STP. Note that standard temperature pressure conditions which HOLDS temperature at 27°C and pressure at 1 ATM. Therefore, for the given subdivisions we need to calculate the volume using the IDEAL gas equation,                                                PV = nRT where, the number of moles is given the calculations are as followsa)   V = 11.2Lb)   V= 33.62Lc) MOLECULES of oxygen,1 mole = Therefore, molecules will have V=   V=0.037L

38.

What type of spectrum is obtained when light emitted from discharge tube containing hydrogen gas is analysed with a spectroscope?

Answer»

e EMISSION spectrum is obtained when light is emitted from “discharge tube” containing “hydrogen gas” is analyzed with a spectroscope. At the point, when an electric release is gone through vaporous hydrogen, the hydrogen PARTICLES separate and the vigorously ENERGIZED hydrogen ions delivered releases “electromagnetic radiation” of seperate range of frequencies. The hydrogen range comprises of a few arrangement of LINES named after their PIONEERS.

39.

What should be the tolerable limit of fluoride ions in drinking water? What happens if it is higher than10 ppm?

Answer»

e is an ionic compound obtained from fluorine, and it is normally found in numerous stones. Around 95 percent of the fluoride added to open water supplies is delivered from phosphorus rock.  Fluoride is added to open water supplies at a normal grouping of around 1 section for each million (1 ppm) or 1 milligram for every liter, or marginally beneath. Normally HAPPENING fluoride fixations in surface waters RELY upon area, however, are commonly low and more often than not do not exceeds 0.3 ppm.  When this level increases it causes fluorosis which influences the teeth and bones. Moderate sums lead to dental impacts; however long haul ingestion of SUBSTANTIAL sums can prompt conceivably EXTREME SKELETAL issues.

40.

What type of organic compounds cannot be Kjeldahlised?

Answer»

l strategy is not PERTINENT to the organic compound CONTAINING nitrogen in nitro and azo gatherings and nitrogen PRESENT in the ring as nitrogen of these mixes does not change to AMMONIUM sulfate when they are treated with concentrated sulphuric ACID. When such compound is acidified with concentrated sulphuric acid instead of forming ammonium sulfate, it leads to the formation of corresponding salts.

41.

What is understood by ‘water gas shift reaction’? Discuss its uses for the preparation of hydrogen.

Answer»

ture of carbon monoxide and water is called as synthesis gas or syngas. This mixture is so called because it is used in the synthesis of methanol and HYDROCARBON. When the carbon monoxide present in the syngas is reacted with high STEAM in presence of iron chromate as CATALYST, it leads to the production of high quantity of dihydrogen and carbon dioxide as bi product. The bi-product is removed by scrubbing the product with sodium arsenite SOLUTION. Chemically, the PROCESS is called as water gas reaction and can be depicted as:

42.

What is the role of red phosphorus in the reduction of alkyl halide using hydroiodic acid?

Answer»

e of red PHOSPHORUS in the “reduction” of “alkyl halide” using hydroiodic acid is as an active REACTANTS. The red phosphorus utilizes the BROMINE or iodine as catalyst and leads to the TRANSFORMATION of “alcohols” to “alkyl halides”. In this conversion process, Phosphorus trihalide is formed as a key moderate. At the end of the process, the phosphoric acid is recovered as the byproduct.

43.

What is the role of dil. in Lassaigne's extract.

Answer»

sence of elements such as NITROGEN, Sulphur, and phosphorus in an “organic compound” is detected by Lassaigne's test. In the Lassaigne's test for detection of halogens in a given SAMPLE the “sodium fusion” EXTRACT is treated with dilute . The MAIN role of dilute in the Lassaigne's extract is to decompose the ions of cyanide as well as sulphide ions of sodium formed during the test. These ions MUST be decomposed because they will get involved in the reaction and will interfere in the final result derivation.

44.

Calculate the temperature of 4.0 mole of a gas occupying 5 at 3.32 bar. (R = 0.083 bar ).

Answer»

e given QUESTION, in order to calculate the TEMPERATURE of 4 moles of a gas which is occupying 5 decimetre cube, we need to use the ideal gas equation.The equation is expressed as,                                                   PV = nRT. In this equation we need to take the UNIVERSAL gas constant R as points 3 bar, the temperature should be taken in kelvin as it is the STANDARD unit for temperature. The calculations are as follows : We know,PV = nRTRearranging the equation,

45.

What is the role of in Kjeldahl solution during digestion.

Answer»

ldhal digestion process comprises of warming a substance with sulphuric acid, which decays the natural substance by oxidation to free the decreased nitrogen as ammonium sulfate.    The obtained product is then refined with a little amount of SODIUM HYDROXIDE, which changes over the ammonium salt to alkali. In the Kjeldhal technique, sodium or potassium sulfate is utilized to lift the boiling point of sulfuric acid from 180°C to 400°C.    Such high temperatures are fundamental to ACCOMPLISHING the DISPOSAL of natural issue and maintenance of the nitrogen in a STEADY mineral frame (ammonium sulfate).

46.

What is the origin of anode rays in the discharge tube? Name the particles which form anode rays.

Answer»

in used a gas-discharge tubewhich had a perforated cathode. .These rays are beams of particlesmoving in a DIRECTION OPPOSITE to the "cathode rays," which are streams of electrons which MOVE TOWARD theanode.

47.

Calculate the value of R in S.I. units for one mole gas at STP.

Answer»

ng to the gas law, it denotes the ideal gas constant of the gas involved and it can be DERIVED from the ideal gas equation.The equation is expressed as,                                                      PV = nRT  where, pressure (P) should be taken as PA.  Volume (V) in metre cube.  The temperature (T) in KELVIN and N stands for NUMBER of moles.  The ideal gas equation becomes,                                                     PV = nRT

48.

At 1127 K and 1 atm pressure, a gaseous mixture of CO and CO₂ in equilibrium with solid carbon has 90.55% CO by mass, , Calculate Kc for this reaction at the above temperature.

Answer»

consider the weight of mixture is 100 g,In that, 90.55% CO by mass MEANS 90.55 g of CO and 9.45 g of CO2 present in the mixture. [ molar mass of CO = 28 g/mol ]   [ molar mass of ]  PARTIAL pressure of CO = MOLE fraction of CO  total pressure  = 0.938   1 atm  Partial pressure of CO = 0.938 atmSimilarly, partial pressure of = 0.062 × 1 atmPartial pressure of = 0.062 atm  Then, ∆ng = NUMBER of mole of gaseous PRODUCTS - number of mole of gaseous reactants  = 2 - 1 = 1

49.

An evacuated glass vessel weighs 50 g when empty, 148 g when filled with a liquid of density 0.98 g/ml and 50.5 g when filled with an ideal gas at 760 mm Hg at 300K. Determine the molecular weight of the gas.

Answer»

Weight of the evacuated glass vessel = 50 g Weight of LIQUID = 148 g; Liquid of density = 0.98 g/ML When filled with ideal gas its weight is 50.5 g with gas at 760 mm Hg at 300 K Actual weight of the liquid = 148 - 50 = 98 g Liquid volume = 100 ml  The vessel volume = vessel of 100 ml contain “ideal gas” at pressure and temperature of 760 mm Hg and 300 K RESPECTIVELY. Weight of ideal gas = 50.5 - 50 = 0.5 g Using, PV = nRT  We Know that, So, (We know that pressure of ideal gas is 760mm Hg. Given pressure is also 760 mm Hg. So 760/760 = P = 1)  Therefore, the “molecular weight” of gas (m) = 123 g/mol

50.

An alkane is obtained as the only product on subjecting a primary alkyl halide to Wurtz reaction. On monobromination this alkane yields a single isomer of a tertiary bromide. Write the structure of alkane and the tertiary bromide.

Answer»

ane should contain TERTIARY hydrogen so that the alkane yields a SINGLE isomer of tertiary bromide on monobromination. This can be possible only if we TAKE the primary alkyl halide has a tertiary hydrogen in the beginning of the WURTZ reaction.