15280 + Interview Questions in Chemistry Page 124 InterviewSolution

6151.	Why do covalent compounds have low melting and boiling points?
Answer» Why do covalent compounds have low melting and boiling points?

Discussion

6152.	Consider the following chemical reactions :I.ASO4(aq)+B(s)→A(s)+BSO4(aq)II. BSO4(aq)+C(s)→B(s)+CSO4(aq)III. CSO4(aq)+D(s)→C(s)+DSO4(aq)IV. DSO4(aq)+B(s)→No reactionNow, choose the correct order of reactivity of metal A, B, C and D.
Answer» Consider the following chemical reactions : I. $A S O_{4} (a q) + B (s) \to A (s) + B S O_{4} (a q)$ II. $B S O_{4} (a q) + C (s) \to B (s) + C S O_{4} (a q)$ III. $C S O 4 (a q) + D (s) \to C (s) + D S O_{4} (a q)$ IV. $D S O_{4} (a q) + B (s) \to N o r e a c t i o n$ Now, choose the correct order of reactivity of metal A, B, C and D.

Discussion

6153.	How is an acid prepared from a non-metal and a base from a metal? Give equation.
Answer» How is an acid prepared from a non-metal and a base from a metal? Give equation.

Discussion

6154.	7. Define the following terms:- 1. Chemical reaction 2. Chemical equation 3. Rancidity 4. Corrosion
Answer» 7. Define the following terms:- 1. Chemical reaction 2. Chemical equation 3. Rancidity 4. Corrosion

Discussion

6155.	Which molecule will act as both bronsted acid and base?
Answer» Which molecule will act as both bronsted acid and base?

Discussion

6156.	Find the electric field of infinite length sheet
Answer» Find the electric field of infinite length sheet

Discussion

6157.	The correct general outer electronic configuration of group 13 elements is:
Answer» The correct general outer electronic configuration of group 13 elements is:

Discussion

6158.	In the silver nitrate test, we confirm the compound given to be HCl due to the formation of a white precipitate. This white precipitate is .
Answer» In the silver nitrate test, we confirm the compound given to be $H C l$ due to the formation of a white precipitate. This white precipitate is .

Discussion

6159.	How does Galvanic cell work?
Answer» How does Galvanic cell work?

Discussion

6160.	How many geometrical isomers are possible of the following? CH3-CH=CH-CH=CH-CH3
Answer» How many geometrical isomers are possible of the following? CH3-CH=CH-CH=CH-CH3

Discussion

6161.	In which molecule the back bonding is stronger and why-BF_{3 }and CF_{4.}
Answer» In which molecule the back bonding is stronger and why-BF_{3 }and CF_{4.}

Discussion

6162.	Mg on reaction with CO2, gives A and gas B.Identify A, B and the reducing and the oxidizing agents in the given reaction.
Answer» Mg on reaction with $C O_{2}$ , gives A and gas B. Identify A, B and the reducing and the oxidizing agents in the given reaction.

Discussion

6163.	A strip of absolutely clear cloth is sprayed with onion juice. The strip is then rubbed with few drops of hydrochloric acid. Will the strip smell like onion? Give a reason for your answer.
Answer» A strip of absolutely clear cloth is sprayed with onion juice. The strip is then rubbed with few drops of hydrochloric acid. Will the strip smell like onion? Give a reason for your answer.

6163.

A strip of absolutely clear cloth is sprayed with onion juice. The strip is then rubbed with few drops of hydrochloric acid. Will the strip smell like onion? Give a reason for your answer.

Answer»

A strip of absolutely clear cloth is sprayed with onion juice. The strip is then rubbed with

few drops of hydrochloric acid. Will the strip smell like onion? Give a reason for your answer.

Discussion

6164.	7. how to prevent salt from clumping by using compounds ?
Answer» 7. how to prevent salt from clumping by using compounds ?

Discussion

6165.	one among the following compounds will not give effervescence with sodium carbonate. (1) C6H5CO2H (2) benzenesulphonic acid (3) C6H5OH (4) picric acid
Answer» one among the following compounds will not give effervescence with sodium carbonate. (1) C6H5CO2H (2) benzenesulphonic acid (3) C6H5OH (4) picric acid

Discussion

6166.	Ionic compounds have high melting and boiling points. This is because of:
Answer» Ionic compounds have high melting and boiling points. This is because of:

Discussion

6167.	Which one of the following solutions having same concentration will have lowest pH value?(1) hydrochloric acid(2) lemon juice(3) water(4) sodium hydroxide
Answer» Which one of the following solutions having same concentration will have lowest pH value? (1) hydrochloric acid (2) lemon juice (3) water (4) sodium hydroxide

Discussion

6168.	In terms of electron transfer, define(a) Oxidation(b) Reduction
Answer» In terms of electron transfer, define (a) Oxidation (b) Reduction

Discussion

6169.	What is techoic acid and what are it's functions?
Answer» What is techoic acid and what are it's functions?

Discussion

6170.	Give three uses of hydrogen.
Answer» Give three uses of hydrogen.

Discussion

6171.	Statement 1: Metal oxides are basic in nature.Statement 2: Metal oxides neutralize the effect of acids and release water, similar to the reaction of a base with an acid.
Answer» Statement 1: Metal oxides are basic in nature. Statement 2: Metal oxides neutralize the effect of acids and release water, similar to the reaction of a base with an acid.

6171.

Statement 1: Metal oxides are basic in nature.Statement 2: Metal oxides neutralize the effect of acids and release water, similar to the reaction of a base with an acid.

Answer»

Statement 1: Metal oxides are basic in nature.

Statement 2: Metal oxides neutralize the effect of acids and release water, similar to the reaction of a base with an acid.

Discussion

6172.	Which one of the following pairs of isomers is an example of metamerism?
Answer» Which one of the following pairs of isomers is an example of metamerism?

Discussion

6173.	Which one of the following set has two non-metals having shiny and lustrous surface?
Answer» Which one of the following set has two non-metals having shiny and lustrous surface?

Discussion

6174.	Lassaigne extract having Na2S when acidified with acetic acid and on addition of lead acetate produces a black precipitate of :
Answer» Lassaigne extract having $N a_{2} S$ when acidified with acetic acid and on addition of lead acetate produces a black precipitate of :

Discussion

6175.	The atomic number has been chosen as the basis for classifying elements. Why?
Answer» The atomic number has been chosen as the basis for classifying elements. Why?

Discussion

6176.	If a double bond is stronger than single bond then why does Ethene break to form Ethane?
Answer» If a double bond is stronger than single bond then why does Ethene break to form Ethane?

Discussion

6177.	Describe all what you will observe and write chemical equations, when limited amount of ammonia gas is passed through the following aqueous solution:(i) ZnCl2(ii) FeSO4(iii) FeCl3(iv) Pb(NO3)2(v) CuSO4(vi) CrCl3.
Answer» Describe all what you will observe and write chemical equations, when limited amount of ammonia gas is passed through the following aqueous solution: (i) ZnCl₂ (ii) FeSO₄ (iii) FeCl₃ (iv) Pb(NO₃)₂ (v) CuSO₄ (vi) CrCl₃.

Discussion

6178.	What do you mean by olfactory indicators?
Answer» What do you mean by olfactory indicators?

Discussion

6179.	Differentiate between burning and rusting?
Answer» Differentiate between burning and rusting?

Discussion

6180.	If A B C are three sets such that AuB=AuC and AnB=AnC then a.A=Bb.B=Cc.A=Cd.A=B=C
Answer» If A B C are three sets such that AuB=AuC and AnB=AnC then a.A=B b.B=C c.A=C d.A=B=C

Discussion

6181.	11. Which of the following ions will exhibit colour in aqueous solution 1.Sc+3 2.La+3 3.Ti+3 4.Lu+3
Answer» 11. Which of the following ions will exhibit colour in aqueous solution 1.Sc+3 2.La+3 3.Ti+3 4.Lu+3

Discussion

6182.	The hardness of water is due the presence of:
Answer» The hardness of water is due the presence of:

Discussion

6183.	Why we cannot calculate the concentration of weak electrolyte at infinite dilution by the help of graph
Answer» Why we cannot calculate the concentration of weak electrolyte at infinite dilution by the help of graph

Discussion

6184.	Question 30We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?
Answer» Question 30 We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?

Discussion

6185.	Complete the given equation: ___________ + HCl→NH4Cl
Answer» Complete the given equation: ___________ + $H C l \to N H_{4} C l$

Discussion

6186.	what are the bases which are not alkalis?
Answer» what are the bases which are not alkalis?

Discussion

6187.	Write a short note on the reaction of non-metals with oxygen, water and acids.
Answer» Write a short note on the reaction of non-metals with oxygen, water and acids.

Discussion

6188.	The minimum volume of water required todissolve 0.1 g lead (II) chloride to get a saturatedsolution (Ksp of PbCl2 3.2 x 10-8, atomic massof Pb = 207 u) is(1) 1.798L(3) 17.95 L(2) 0.36 L(4) 0.18 L
Answer» The minimum volume of water required todissolve 0.1 g lead (II) chloride to get a saturatedsolution (Ksp of PbCl2 3.2 x 10-8, atomic massof Pb = 207 u) is(1) 1.798L(3) 17.95 L(2) 0.36 L(4) 0.18 L

Discussion

6189.	If a carbon compound has 4 carbon atoms in its skeletal and the 2nd carbon atom has a doubly bonded oxygen attached to it, what is it called?
Answer» If a carbon compound has 4 carbon atoms in its skeletal and the $2^{n d}$ carbon atom has a doubly bonded oxygen attached to it, what is it called?

Discussion

6190.	Since electron affinity of third period is more than that of second period then why does electron affinity of lithium is more than sodium?
Answer» Since electron affinity of third period is more than that of second period then why does electron affinity of lithium is more than sodium?

Discussion

6191.	What is going to be the equivalent mass of acids when they react with substances other than bases?
Answer» What is going to be the equivalent mass of acids when they react with substances other than bases?

Discussion

6192.	Question 35Balance the following chemical equations and identify the type of chemical reaction.(a) Mg(s)+Cl2(g)→MgCl2(s)(b) HgO(s)Heat−−→Hg(l)+O2(g)(c) Na(s)+S(s)Fuse−−→Na2S(s)(d) TiCl4(l)+Mg(s)→Ti(s)+MgCl2(s)(e) CaO(s)+SiO2(s)→CaSiO3(s)(f) H2O2(l)UV−−→H2O(l)+O2(g)
Answer» Question 35 Balance the following chemical equations and identify the type of chemical reaction. (a) Mg(s)+Cl2(g)→MgCl2(s) (b) HgO(s)Heat−−→Hg(l)+O2(g) (c) Na(s)+S(s)Fuse−−→Na2S(s) (d) TiCl4(l)+Mg(s)→Ti(s)+MgCl2(s) (e) CaO(s)+SiO2(s)→CaSiO3(s) (f) H2O2(l)UV−−→H2O(l)+O2(g)

Discussion

6193.	The hydrocarbon which decolourises KMnO_4 /OH^- solution and does not give any precipitate with amm.AgNO_{3 } a)benzene b)acetylene c)propyne d)1-butyn
Answer» The hydrocarbon which decolourises KMnO_4 /OH^- solution and does not give any precipitate with amm.AgNO_{3 } a)benzene b)acetylene c)propyne d)1-butyn

Discussion

6194.	In case of non-polar covalent bond, the covalent bond is formed in the ___ of atoms and shared electrons are ___ distributed.
Answer» In case of non-polar covalent bond, the covalent bond is formed in the ___ of atoms and shared electrons are ___ distributed.

Discussion

6195.	Give two examples of amphoteric hydroxides.
Answer» Give two examples of amphoteric hydroxides.

Discussion

6196.	(i) With the help of equations, give an outline for the manufacture of sulphuric acid by the contact process.(ii) What property of sulphuric acid is shown by the reaction of concentrated sulphuric acid when heated with(a) potassium nitrate(b) carbon?
Answer» (i) With the help of equations, give an outline for the manufacture of sulphuric acid by the contact process. (ii) What property of sulphuric acid is shown by the reaction of concentrated sulphuric acid when heated with (a) potassium nitrate (b) carbon?

Discussion

6197.	How to identify whether a given salt is acidic , basic or neutral?
Answer» How to identify whether a given salt is acidic , basic or neutral?

Discussion

6198.	Which soft metal combines with chlorine to make table salt?
Answer» Which soft metal combines with chlorine to make table salt?

Discussion

6199.	Give the name and formula of a substance which on treatment with chlorine yields bleaching powder.
Answer» Give the name and formula of a substance which on treatment with chlorine yields bleaching powder.

Discussion

6200.	What happens when an acid reacts with a base? Explain by taking the example of hydrochloric acid and sodium hydroxide. Give an equation of the chemical reaction which takes place. What is the special name of such a reaction?
Answer» What happens when an acid reacts with a base? Explain by taking the example of hydrochloric acid and sodium hydroxide. Give an equation of the chemical reaction which takes place. What is the special name of such a reaction?

Discussion

Explore topic-wise InterviewSolutions in .

Why do covalent compounds have low melting and boiling points?

Consider the following chemical reactions :I.ASO4(aq)+B(s)→A(s)+BSO4(aq)II. BSO4(aq)+C(s)→B(s)+CSO4(aq)III. CSO4(aq)+D(s)→C(s)+DSO4(aq)IV. DSO4(aq)+B(s)→No reactionNow, choose the correct order of reactivity of metal A, B, C and D.

How is an acid prepared from a non-metal and a base from a metal? Give equation.

7. Define the following terms:- 1. Chemical reaction 2. Chemical equation 3. Rancidity 4. Corrosion

Which molecule will act as both bronsted acid and base?

Find the electric field of infinite length sheet

The correct general outer electronic configuration of group 13 elements is:

In the silver nitrate test, we confirm the compound given to be HCl due to the formation of a white precipitate. This white precipitate is .

How does Galvanic cell work?

How many geometrical isomers are possible of the following? CH3-CH=CH-CH=CH-CH3

In which molecule the back bonding is stronger and why-BF_{3 }and CF_{4.}

Mg on reaction with CO2, gives A and gas B.Identify A, B and the reducing and the oxidizing agents in the given reaction.

A strip of absolutely clear cloth is sprayed with onion juice. The strip is then rubbed with few drops of hydrochloric acid. Will the strip smell like onion? Give a reason for your answer.

7. how to prevent salt from clumping by using compounds ?

one among the following compounds will not give effervescence with sodium carbonate. (1) C6H5CO2H (2) benzenesulphonic acid (3) C6H5OH (4) picric acid

Ionic compounds have high melting and boiling points. This is because of:

Which one of the following solutions having same concentration will have lowest pH value?(1) hydrochloric acid(2) lemon juice(3) water(4) sodium hydroxide

In terms of electron transfer, define(a) Oxidation(b) Reduction

What is techoic acid and what are it's functions?

Give three uses of hydrogen.

Statement 1: Metal oxides are basic in nature.Statement 2: Metal oxides neutralize the effect of acids and release water, similar to the reaction of a base with an acid.

Which one of the following pairs of isomers is an example of metamerism?

Which one of the following set has two non-metals having shiny and lustrous surface?

Lassaigne extract having Na2S when acidified with acetic acid and on addition of lead acetate produces a black precipitate of :

The atomic number has been chosen as the basis for classifying elements. Why?

If a double bond is stronger than single bond then why does Ethene break to form Ethane?

Describe all what you will observe and write chemical equations, when limited amount of ammonia gas is passed through the following aqueous solution:(i) ZnCl2(ii) FeSO4(iii) FeCl3(iv) Pb(NO3)2(v) CuSO4(vi) CrCl3.

What do you mean by olfactory indicators?

Differentiate between burning and rusting?

If A B C are three sets such that AuB=AuC and AnB=AnC then a.A=Bb.B=Cc.A=Cd.A=B=C

11. Which of the following ions will exhibit colour in aqueous solution 1.Sc+3 2.La+3 3.Ti+3 4.Lu+3

The hardness of water is due the presence of:

Why we cannot calculate the concentration of weak electrolyte at infinite dilution by the help of graph

Question 30We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?

Complete the given equation: ___________ + HCl→NH4Cl

what are the bases which are not alkalis?

Write a short note on the reaction of non-metals with oxygen, water and acids.

The minimum volume of water required todissolve 0.1 g lead (II) chloride to get a saturatedsolution (Ksp of PbCl2 3.2 x 10-8, atomic massof Pb = 207 u) is(1) 1.798L(3) 17.95 L(2) 0.36 L(4) 0.18 L

If a carbon compound has 4 carbon atoms in its skeletal and the 2nd carbon atom has a doubly bonded oxygen attached to it, what is it called?

Since electron affinity of third period is more than that of second period then why does electron affinity of lithium is more than sodium?

What is going to be the equivalent mass of acids when they react with substances other than bases?

Question 35Balance the following chemical equations and identify the type of chemical reaction.(a) Mg(s)+Cl2(g)→MgCl2(s)(b) HgO(s)Heat−−→Hg(l)+O2(g)(c) Na(s)+S(s)Fuse−−→Na2S(s)(d) TiCl4(l)+Mg(s)→Ti(s)+MgCl2(s)(e) CaO(s)+SiO2(s)→CaSiO3(s)(f) H2O2(l)UV−−→H2O(l)+O2(g)

The hydrocarbon which decolourises KMnO_4 /OH^- solution and does not give any precipitate with amm.AgNO_{3 } a)benzene b)acetylene c)propyne d)1-butyn

In case of non-polar covalent bond, the covalent bond is formed in the ___ of atoms and shared electrons are ___ distributed.

Give two examples of amphoteric hydroxides.

(i) With the help of equations, give an outline for the manufacture of sulphuric acid by the contact process.(ii) What property of sulphuric acid is shown by the reaction of concentrated sulphuric acid when heated with(a) potassium nitrate(b) carbon?

How to identify whether a given salt is acidic , basic or neutral?

Which soft metal combines with chlorine to make table salt?

Give the name and formula of a substance which on treatment with chlorine yields bleaching powder.

What happens when an acid reacts with a base? Explain by taking the example of hydrochloric acid and sodium hydroxide. Give an equation of the chemical reaction which takes place. What is the special name of such a reaction?

In case of non-polar covalent bond, the covalent bond is formed in the _ of atoms and shared electrons are _ distributed.