52639 + Interview Questions in Secondary School in Chemistry

1.	C3H8 + O2 g CO2 + H2Osolve this equation
Answer» There will be 10 oxygens on the products SIDE and 2 on the REACTANTS so to balance these out, we multiply the 02 on the reactants side by 5. The FINAL equation will be C3H8 + 502 ----> 3CO2 + 4H20.Explanation:please MARK as branlist

Discussion

2.	2 What material should be added to a soil which is too basic ? How does this material help in reducing the basic nature of the soil ?
Answer» The simplest and the organic way to turn the plain soil into fertile one is by ADDING eco-friendly components LIKE ANIMAL MANURE, compost and green manure. Bio-degradable waste just like vegetable waste is an organic componentExplanation:Hope you UNDERSTAND mate

Discussion

3.	How is the electronic configuration of hydrogen suitable for its chamical reaction
Answer» As hydrogen is the most SIMPLEST from all element Thus it is also EASY to UNDERSTAND and carry out CHEMICAL reactionHope this will help you

Discussion

4.	1 g of magnesium is burnt with o.56 g O2 in a closed vessel . which reactant left in excess and how much
Answer» f all write a BALANCE Rxn2Mg +O2 →→2 MgoNow 2 moles of mg react with 1 mole of oxygen32 gm oxygen react with 48 gm of mgApply unitary method32 gm o2 …….reacts with 48 gm mg1gm of o2 will react ……..48／32So,0.56 gm o2 will react ……..48×0.56/32=0.84 gm MAGNESIUM .This is the amount of mg that have been consume or react with oxygen …..so ,left amount1–0.84=0.16 gmI HOPE this will HELP u ...

Discussion

5.	Differentiate between catalyst promoter and catalyst paison with suitable example of each
Answer» A catalyst is a substance that increases the rate of a CHEMICAL reaction without itself being changed at the END of the chemical reaction. ... On the other hand, PROMOTER is a material that enhances the ACTION of a catalyst without actually having any CATALYTIC value itselfExplanation:hope you understand mate

Discussion

6.	Spatial orientation of orbital
Answer» tion:Spatial orientation: Spatial orientation of orbitals MEANS the 3-dimensional (x,y and Z AXIS) orientation of ORBITAL in space. ... So, among all quantum numbers, magnetic quantum NUMBER DESCRIBES the specific orientation of orbital. For example if we are talking about p orbital

Discussion

7.	1 g of magnesium is burnt with o.56 g O2 in a closed vessel . which reagent left in excess and how much
Answer» MG is burnt with 0.56g O2 in a closed vessel. Which reagent is LEFT in excess and how much?First of all write a balance Rxn2Mg +o2 →→2 MgoNow 2 moles of mg REACT with 1 mole of oxygen32 gm oxygen react with 48 gm of mgApply UNITARY method32 gm o2 …….reacts with 48 gm mg1gm of o2 will react ……..48／32So,0.56 gm o2 will react ……..48×0.56/32=0.84 gm magnesium .This is the amount of mg that have been consume or react with oxygen …..so ,left amount1–0.84=0.16Hope it Helps For Quick Help in 5 Hours Follow Me

Discussion

8.	What do you mean by mandelleves periodic law
Answer» According to the mandelleve PERIODIC LAW the properties of elements are the periodic function of their ATOMIC messes.Explanation: MAY it will be HELPFUL for you. Mark as brainlist.

Discussion

9.	Which of the following is the correct relation for tl/2 of a first order reaction
Answer» you will be ABLE to GET the PRESENT INVENTION the present invention the present invention the present invention of WINGS

Discussion

10.	Why is respiration considered as exothermic process?
Answer» tion:Carbolydrates present in FOOD are broken down to form glucose. This glucose combines with oxygen in the CELLS of our body and provides energy. This reaction is KNOWN as respiration. hence,respiration is considered as an EXOTHERMIC reaction.

Discussion

11.	. Give an example of photochemical reaction.
Answer» Examples of photochemical reactionsPhotosynthesis: plants use solar energy to convert CARBON dioxide and WATER into glucose and oxygen. Human formation of VITAMIN D by exposure to sunlight. Bioluminescence: e.g. In FIREFLIES, an enzyme in the abdomen catalyzes a reaction that produced light.Hope it helps you!Please mark me as Brainliest

Discussion

12.	. What is an oxidation reaction? Is it exothermic or endothermic? Give one example of oxidation Reaction.
Answer» on is the loss of electrons during a reaction by a MOLECULE, atom or ion. Oxidation occurs when the oxidation state of a molecule, atom or ion is increased. The opposite process is CALLED reduction, which occurs when there is a gain of electrons or the oxidation state of an atom, molecule, or ion decreases.Oxidation reactions are EXOTHERMIC. For example, when copper (Cu) is heated in the presence of air, it gets oxidised to form copper oxide (CuO)....plzz mark it as the brainliest ANSWER!!!

Discussion

13.	For an isothermal free expansion of an ideal gas into vacuum, which of the following represents the correct set of values ?(1) AU=0,q>0, w0,q>0, w=0(3) AU-0,2-0,w=0(4) AU
Answer» OPTION C is CORRECT from my POINT of VIEW...

Discussion

14.	Octane number of gasoline is a measure of its : (1) Knocking tendency(2) Ignition delay(3) Ignition temperature,(4) Smoke point
Answer» Hᴇʏᴀ..!◆━━━━━━━▣✦▣━━━━━━━━◆Oᴄᴛᴀɴᴇ ɴᴜᴍʙᴇʀ ᴏғ ɢᴀsᴏʟɪɴᴇ ɪs ᴍᴇᴀsᴜʀᴇᴅ ᴏғ ɪᴛs its RESISTANCE to KNOCK. ◆━━━━━━━▣✦▣━━━━━━━━◆Thx ❤️

Discussion

15.	9. Benzene reacts with propene in the presence of H,so, catalyst to give :(1) n-Propylbenzene(2) Benzophenone(3) Cumene(4) Acetophenone
Answer» Benzene REACTS with PROPENE in the PRESENCE of H,so, catalyst to give : (1) n-PropylbenzeneExplanation:here's the answer please FOLLOW me

Discussion

16.	When aniline is heated with glycerol in the presence of sulfuric acid and nitrobenzene, it gives quinoline. This reaction is called :(1) Fischer Synthesis(2) Corey-House Synthesis(3) Diazotization(4) Skraup Synthesis
Answer» The Skraup synthesis is a chemical reaction used to synthesize quinolines. It is named after the CZECH chemist Zdenko Hans Skraup (1850-1910). In the ARCHETYPAL Skraup reaction, aniline is heated with sulfuric acid, GLYCEROL, and an oxidizing agent such as nitrobenzene to yield quinoline.Explanation:here's the ANSWER please follow me

Discussion

17.	. Which of the following compounds is most acidic ? (1) Ethanol(2) Phenol(3) Acetic acid(4) Formic acid
Answer» ACETIC ACID is the most ACIDIC COMPOUNDS

Discussion

18.	. Phenylmagnesium bromide reacts with co, followed by acid hydrolysis to form:(1) Phenol(2) Benzoic acid(3) Bromobenzene(4) Acetophenone
Answer» TION:the ANSWER is 3 BRO BROMOBENZENE

Discussion

19.	. Ethyl acetoacetate reacts with phenylhydrazine to give : (1) Antipyrine2) 4-Methyl uracil(3) Barbituric acid(4) Hydantoin
Answer» 2)4-Methayl URALIC acetocates REACTS with PHENYLHYDRAZINE

Discussion

20.	Benzamide reacts with Br2 and KOH to give : (1) Benzene(2) Berzylamine(3) Benzonitrite(4) Aniline
Answer» Berzylamine EXPLANATION:MARK me as BRAINLIEST.

Discussion

21.	Ethyl acetoacetate reacts with phenylhydrazine to give : (1) Antipyrine12) 4. Methyl uracil(3) Barbituric acid(4) Hydantoin
Answer» METHYL uracilExplanation:PLEASE MARK me as BRAINLIEST

Discussion

22.	Calcium acetate on strong heating gives : (1) Methane + Caco,(2) Ethane + Caco(3) Acetone + Caco,(4) Ethane + CaO
Answer» OPTION 2) is correct✅✅✅

Discussion

23.	. Ozonolysis of 2-butyne gives: (1) Formic acid(2) Própanoic acid(3) Acetic acid(4) Butanoic acid
Answer» OZONOLYSIS of 2-butyne GIVES ACETIC acid❤

Discussion

24.	This is my last question GuyzzHOW MANY COUNTRIES USE THE SI SYSTEM?
Answer» 10Explanation:because they USE the same THINGS as the TEN COUNTRIES

Discussion

25.	Explain the formation of the following ionic compounds using electron dot structure. a) Sodium oxide b) Magnesium chloride. Pls answer it fast
Answer» re BUDDY!The IMAGE CONTAINS your ans.Have a GREAT DAY!

Discussion

26.	Compare wind power and the power of flowing water for generating electricity. What are the hindrances in developing them?
Answer» Developing WIND power REQUIRES large open area and proper wind flow in that area , while in case of developing power with water , rivers with water availability all year long and land NEAR it are rare to find , it has environmental issues also .Explanation:here's the answer PLEASE follow me

Discussion

27.	How do I insert 10^ (-3) = x/2 on the calculator?
Answer» why should you?bhayi AMERICAN nahi HAIN ham khud ka dimag USE KARO

Discussion

28.	Briefly explain mordern periodic table . state difference s ?
Answer» Mendleeves periodic table ELEMENTS are arranged in order of increasing MASS NUMBER where as in modern periodic table elements are arranged in order of increasing atomic number

Discussion

29.	What are the main Characteristics of SI unit?
Answer» uld have INTERNATIONAL acceptance.●It should be of a convenient size.●It should be accepted by general CONFERENCE of the MEASUREMENT and units.●The S.I system is a decimal system with each COMPONENT a MULTIPLE of 10.

Discussion

30.	when converting a number from scientific notation to standard notation ,if the power of 10 is , move the decimal point to the left
Answer» ehhhhhhhhhhhhhhhhhhhhhhhhh

Discussion

31.	WRITE COHERENT DERIVED UNITS EXPRESSED IN TERMS OF BASE UNITS.
Answer» ...!! YE le coding.... xD likh dena OK...!! Tc ❤ Or Hn isse chrome se copy kr liyo I'd chrome PE LOG in kr then tere que pe ja n easily tko coding MIL JAYEGI.... ❤☺

Discussion

32.	The number of water molecules present in a drop of water weighing 0.018 g is (A) 6.021026 (B) 6.021023 (C) 6.021020 (D) 6.021019
Answer» (C) 6.02 × 10^20Explanation:PLS FIND the ATTACHMENT

Discussion

33.	if the temperature of a liquid increases, the density of the liquid decreases because the particals move farther apart. what are the variables in her hypothesis
Answer» tion:If we take WATER then ACCORDING to the relation , If TEMPERATURE increases density decreases but while what is going from 0 degrees to 4 degrees , then instead of decreasing the density it increases density this is because of the hydrogen BONDING in that .be brainly:)

Discussion

34.	Pls explain. A) 0.93 mol B) 1.87 mol C) 2.80 mol D) 3.74 mol
Answer» OPTION B) 1.87 molExplanation:Kindly LOOK at the ATTACHMENT for the requested solution.Thanks!HOPE it helps you.

Discussion

35.	I need some one to help me cuuumm now
Answer» hould we COME now to HELP you

Discussion

36.	Give the equation for Heat on sulphur with conc. sulphuric acid.
Answer» Hot sulfur trioxide PASSES through the heat exchanger and is dissolved in concentrated H2SO4 in the absorption tower to form oleum :H2SO4(l)+SO3(G)⇒H2S2O7(l)H2SO4(l)+SO3(g)⇒H2S2O7(l)Oleum is reacted with water to form concentrated H2SO4H2SO4.H2S2O7(l)+H2O(l)⇒2H2SO4(l)

Discussion

37.	Example of natural changes
Answer» EXAMPLES of NATURAL CHANGES are GROWTH in man and seasonal changes and examples of man-made changes are burning of FUELS and chemical reactions.

Discussion

38.	Zero group elements are called noble gases
Answer» -YESS...... Zero group elements are called NOBLE or INERT GASES because all the elements BELONGING to that group have valency 0.☺☺

Discussion

39.	A cook makes a pudding as shown. The pudding is placed in a very hot oven until the top of the egg whites turns brown.it is then removed from the oven. Why does the ice –cream stay cold?
Answer» TION:because it was PROTECTED from from the EGG SHELL

Discussion

40.	Explain all the factors on which rate of evaporatin depends ?
Answer» ≈ SYMBOLISES DIRECTLY PROPOTIONAL TO RATE OF EVAPORATION≠ SYMBOLISES INDIRECTLY PROPOTIONAL TO RATE OF EVAPORATIONExplanation:1. WIND SPEED ≈ DIRECTLY PROPOTIONAL TO RATE OF EVAPORATION2. TEMPRATURE ≈ DIRECTLY PROPOTIONAL TO RATE OF EVAPORATION3. HUMIDITY ≠ INDIRECTLY PROPOTIONAL TO RATE OF EVAPORATION4.WIND SPEED ≈INDIRECTLY PROPOTIONAL TO RATE OF EVAPORATIONPLEASE PLEASE MARK ME THE BRAINLIEST AS IT ALL HAND TYPED AND THE EFFORTS SHOULD BE APPRECIATED.

Discussion

41.	Give a chemical reaction for burning of sugar ?
Answer» arey MEM ANS ichina meeru BRAINLIEST cheyaru chirakochindi NENU ans telisina cheyya

Discussion

42.	Find the concentration of glucose solution that is equivalent to 6 gram per liter of urea solution
Answer» TION:GIVEN______The concentration of urea = 6 gm/LM.wt of glucose = 180 gmM.wt of urea = 60 gmTO FIND_____The concentration of glucose equivalent to the given concentration of urea.CALCULATION____- The Molarity of urea, M1 = (6 × 1000) / (60 × 1000)⇒ M1 = 1 / 10 = 0.1 M- Now applying this CONDITION to glucose, we get:M1 = (w × 1000) / (180 × 1000)⇒ 0.1 = w / 180⇒ w = 18 gm⇒ 1 litre of glucose solution contains 18 gm glucose.- So, the concentration of glucose that is equivalent to the given concentration of urea is 18 gm/LThanks!HOPE it helps you.

Discussion

43.	Sarah and Jim investigated the effect of temperature on the solubility of copper sulfate. They dissolved copper sulfate crystals in the same volume of water until no more would dissolve. This means the solution was saturated. They measured the mass of copper sulfate needed to make a saturated solution using water at different temperatures. They plotted their results on a grid. (a) One of the mass readings appears to be wrong (anomalous). Name the anomalous result from the graph. (b) Suggest one mistake Sarah and Jim might have made to produce this anomalous result.
Answer» They dissolved copper sulfate CRYSTALS in the same volume of WATER until no more would DISSOLVE. This means the solution was saturated..They measured the mass of copper sulfate needed to make a saturated solution using water at DIFFERENT temperatures.Explanation:HOPE you understand mate

Discussion

44.	For which elementary reaction, the order of reaction and molecularity are same
Answer» ET TEXT BOOK U can FIND it

Discussion

45.	What is the phenemnon in which the water is balanced on the earth describe
Answer» The hdroginic cycle is the continuous MOVEMENT of water in air,on the surface of below the earth. The cycle is the EXCHANGE of ENERGY which influence climate. when water condenses, it releases energy and WARM the environment.Hope It HELP You .Follow me plz .

Discussion

46.	20% salt solution has 30 gram of salt dissolved in it find the amount of solvent
Answer» 80%MATE Explanation:HOPE it HELPS mark me as BRAINLIEST

Discussion

47.	While preparing dilute acids or bases to a large volume of water only concentrated solution should be added. Why is it so? Justify. LSN : ACIDS,BASES AND SALTS.
Answer» If you add water to acid it forms an EXTREMELY CONCENTRATED solution of acid initially. So much heat is released that the solution may boil very violently, splashing concentrated acid out of the CONTAINER and all this because the reaction is exothermic.hope it helpsplz MARK my ANSWER as the brainliestthanksExplanation:

Discussion

48.	The conductivity of a saturated solution of CsI3 is 3.06 x 10-2 ohm m-1 and its molar conductance is 1.53 ohm-1 m2 mol-1. The Ksp of Csl3 will be:
Answer» PLEASE GIVE ME A BRANLIAST ANSWERThe conductivity of a saturated solution of CsI3 is 3.06 X 10-2 ohm m-1 and its MOLAR conductance is 1.53 ohm-1 m2 mol-1. The Ksp of CSL3 will be:

Discussion

49.	Difference between ethylamine and aniline
Answer» Ethylamine is an organic compound with the formula CH₃CH₂NH₂. This colourless gas has a strong ammonia-like odor. It is miscible with virtually all solvents. It is a nucleophilic base, as is typical for amines. Ethylamine is widely used in chemical industry and organic synthesis.Aniline is an organic compound with the formula C₆H₅NH₂. Consisting of a phenyl GROUP attached to an amino group, aniline is the simplest aromatic amine. Its main USE is in the MANUFACTURE of precursors to polyurethane and other industrial chemicals. Like most VOLATILE amines, it has the odor of rotten fish.

Discussion

50.	Electronic configurations of the five neutral atoms are given below: A. 1s2 2s2 2p6 3s2. B. 1s2 2s2 2p6 3s1. C. 1s2 2s2 2p1. D. 1s2 2s2 2p3. E. 1s2 2s2 2p6. Write the empirical formula for the substances containing (i) A and D (ii) B and D (iii) D and D (iv) E and E using proper symbols of the elements.
Answer» A)CALCIUMB)POTASSIUMC)BOROND)NITROGENE)NEONHope it HELPS and PLEASE MARK me as BRAINLIEST

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

C3H8 + O2 g CO2 + H2Osolve this equation​

2 What material should be added to a soil which is too basic ? How does this material help in reducing the basic nature of the soil ? ​

How is the electronic configuration of hydrogen suitable for its chamical reaction

1 g of magnesium is burnt with o.56 g O2 in a closed vessel . which reactant left in excess and how much

Differentiate between catalyst promoter and catalyst paison with suitable example of each​

Spatial orientation of orbital

1 g of magnesium is burnt with o.56 g O2 in a closed vessel . which reagent left in excess and how much

What do you mean by mandelleves periodic law

Which of the following is the correct relation for tl/2 of a first order reaction

Why is respiration considered as exothermic process?

. Give an example of photochemical reaction.

. What is an oxidation reaction? Is it exothermic or endothermic? Give one example of oxidation Reaction.

For an isothermal free expansion of an ideal gas into vacuum, which of the following represents the correct set of values ?(1) AU=0,q>0, w0,q>0, w=0(3) AU-0,2-0,w=0(4) AU

Octane number of gasoline is a measure of its : (1) Knocking tendency(2) Ignition delay(3) Ignition temperature,(4) Smoke point​

9. Benzene reacts with propene in the presence of H,so, catalyst to give :(1) n-Propylbenzene(2) Benzophenone(3) Cumene(4) Acetophenone​

When aniline is heated with glycerol in the presence of sulfuric acid and nitrobenzene, it gives quinoline. This reaction is called :(1) Fischer Synthesis(2) Corey-House Synthesis(3) Diazotization(4) Skraup Synthesis​

. Which of the following compounds is most acidic ? (1) Ethanol(2) Phenol(3) Acetic acid(4) Formic acid​

. Phenylmagnesium bromide reacts with co, followed by acid hydrolysis to form:(1) Phenol(2) Benzoic acid(3) Bromobenzene(4) Acetophenone​

. Ethyl acetoacetate reacts with phenylhydrazine to give : (1) Antipyrine2) 4-Methyl uracil(3) Barbituric acid(4) Hydantoin​

Benzamide reacts with Br2 and KOH to give : (1) Benzene(2) Berzylamine(3) Benzonitrite(4) Aniline​

Ethyl acetoacetate reacts with phenylhydrazine to give : (1) Antipyrine12) 4. Methyl uracil(3) Barbituric acid(4) Hydantoin​

Calcium acetate on strong heating gives : (1) Methane + Caco,(2) Ethane + Caco(3) Acetone + Caco,(4) Ethane + CaO​

. Ozonolysis of 2-butyne gives: (1) Formic acid(2) Própanoic acid(3) Acetic acid(4) Butanoic acid​

This is my last question GuyzzHOW MANY COUNTRIES USE THE SI SYSTEM? ​

Explain the formation of the following ionic compounds using electron dot structure. a) Sodium oxide b) Magnesium chloride. Pls answer it fast

Compare wind power and the power of flowing water for generating electricity. What are the hindrances in developing them?

How do I insert 10^ (-3) = x/2 on the calculator?

Briefly explain mordern periodic table . state difference s ?​

What are the main Characteristics of SI unit?​

when converting a number from scientific notation to standard notation ,if the power of 10 is , move the decimal point to the left

WRITE COHERENT DERIVED UNITS EXPRESSED IN TERMS OF BASE UNITS.​

The number of water molecules present in a drop of water weighing 0.018 g is (A) 6.021026 (B) 6.021023 (C) 6.021020 (D) 6.021019

if the temperature of a liquid increases, the density of the liquid decreases because the particals move farther apart. what are the variables in her hypothesis

Pls explain. A) 0.93 mol B) 1.87 mol C) 2.80 mol D) 3.74 mol

I need some one to help me cuuumm now

Give the equation for Heat on sulphur with conc. sulphuric acid.​

Example of natural changes

Zero group elements are called noble gases

A cook makes a pudding as shown. The pudding is placed in a very hot oven until the top of the egg whites turns brown.it is then removed from the oven. Why does the ice –cream stay cold?

Explain all the factors on which rate of evaporatin depends ?

Give a chemical reaction for burning of sugar ?

Find the concentration of glucose solution that is equivalent to 6 gram per liter of urea solution

For which elementary reaction, the order of reaction and molecularity are same

What is the phenemnon in which the water is balanced on the earth describe

20% salt solution has 30 gram of salt dissolved in it find the amount of solvent

While preparing dilute acids or bases to a large volume of water only concentrated solution should be added. Why is it so? Justify. LSN : ACIDS,BASES AND SALTS. ​

The conductivity of a saturated solution of CsI3 is 3.06 x 10-2 ohm m-1 and its molar conductance is 1.53 ohm-1 m2 mol-1. The Ksp of Csl3 will be:

Difference between ethylamine and aniline

C3H8 + O2 g CO2 + H2Osolve this equation

2 What material should be added to a soil which is too basic ? How does this material help in reducing the basic nature of the soil ?

Differentiate between catalyst promoter and catalyst paison with suitable example of each

Octane number of gasoline is a measure of its : (1) Knocking tendency(2) Ignition delay(3) Ignition temperature,(4) Smoke point

9. Benzene reacts with propene in the presence of H,so, catalyst to give :(1) n-Propylbenzene(2) Benzophenone(3) Cumene(4) Acetophenone

When aniline is heated with glycerol in the presence of sulfuric acid and nitrobenzene, it gives quinoline. This reaction is called :(1) Fischer Synthesis(2) Corey-House Synthesis(3) Diazotization(4) Skraup Synthesis

. Which of the following compounds is most acidic ? (1) Ethanol(2) Phenol(3) Acetic acid(4) Formic acid

. Phenylmagnesium bromide reacts with co, followed by acid hydrolysis to form:(1) Phenol(2) Benzoic acid(3) Bromobenzene(4) Acetophenone

. Ethyl acetoacetate reacts with phenylhydrazine to give : (1) Antipyrine2) 4-Methyl uracil(3) Barbituric acid(4) Hydantoin

Benzamide reacts with Br2 and KOH to give : (1) Benzene(2) Berzylamine(3) Benzonitrite(4) Aniline

Ethyl acetoacetate reacts with phenylhydrazine to give : (1) Antipyrine12) 4. Methyl uracil(3) Barbituric acid(4) Hydantoin

Calcium acetate on strong heating gives : (1) Methane + Caco,(2) Ethane + Caco(3) Acetone + Caco,(4) Ethane + CaO

. Ozonolysis of 2-butyne gives: (1) Formic acid(2) Própanoic acid(3) Acetic acid(4) Butanoic acid

This is my last question GuyzzHOW MANY COUNTRIES USE THE SI SYSTEM?

Briefly explain mordern periodic table . state difference s ?

What are the main Characteristics of SI unit?

WRITE COHERENT DERIVED UNITS EXPRESSED IN TERMS OF BASE UNITS.

Give the equation for Heat on sulphur with conc. sulphuric acid.

While preparing dilute acids or bases to a large volume of water only concentrated solution should be added. Why is it so? Justify. LSN : ACIDS,BASES AND SALTS.