15280 + Interview Questions in Chemistry Page 165 InterviewSolution

8201.	A compound X on heating gives a colourless gas. The residue is dissolved in water to give Y. To the aqueous solution of Y, CO2 is passed and it produces Z, which on gentle heating gives back X. Compound X is:
Answer» A compound $X$ on heating gives a colourless gas. The residue is dissolved in water to give $Y$ . To the aqueous solution of $Y$ , $C O_{2}$ is passed and it produces $Z$ , which on gentle heating gives back $X$ . Compound $X$ is:

Discussion

8202.	How many years it would take to spend Avogadro's number of rupees at the rate of 1 million rupees in one second?
Answer» How many years it would take to spend Avogadro's number of rupees at the rate of 1 million rupees in one second?

Discussion

8203.	What is the result when Copper(\|\|)oxide is heated?
Answer» What is the result when Copper(\|\|)oxide is heated?

Discussion

8204.	Statement:Should all the unauthorized structures in the city be demolished? Argument: I. No, where will the people residing in such houses live? II. Yes, this will give a clear message to the general public and they will refrain from constructing unauthorized buildings.
Answer» Statement:Should all the unauthorized structures in the city be demolished? Argument: I. No, where will the people residing in such houses live? II. Yes, this will give a clear message to the general public and they will refrain from constructing unauthorized buildings.

8204.

Statement:Should all the unauthorized structures in the city be demolished? Argument: I. No, where will the people residing in such houses live? II. Yes, this will give a clear message to the general public and they will refrain from constructing unauthorized buildings.

Answer»

Statement:Should all the unauthorized structures in the city be demolished?

Argument:

I. No, where will the people residing in such houses live?

II. Yes, this will give a clear message to the general public and they will refrain from constructing unauthorized buildings.

Discussion

8205.	In the following sequence of reactions identify product ‘X’
Answer» In the following sequence of reactions identify product ‘X’

Discussion

8206.	2. The correct order increasing of lattice energies of the following ionic compounds is Al2O3,CaO,MgCl2,NaCl
Answer» 2. The correct order increasing of lattice energies of the following ionic compounds is Al2O3,CaO,MgCl2,NaCl

Discussion

8207.	A compound contains 69.5% oxygen and 30.5% nitrogen and its molecular mass is 92g/mol. The formula of that compound is:
Answer» A compound contains 69.5% oxygen and 30.5% nitrogen and its molecular mass is 92g/mol. The formula of that compound is:

Discussion

8208.	Which of the following is not a property of aluminium?
Answer» Which of the following is not a property of aluminium?

Discussion

8209.	Write the equation for the following laboratory preparations:(i) Ethane from sodium propionate.(ii) Ethene from iodoethane.(iii) Ethyne from calcium carbide.
Answer» Write the equation for the following laboratory preparations: (i) Ethane from sodium propionate. (ii) Ethene from iodoethane. (iii) Ethyne from calcium carbide.

Discussion

8210.	The process in which the surface of the metals is cleaned by a chemical is called
Answer» The process in which the surface of the metals is cleaned by a chemical is called

Discussion

8211.	What is the ph of sodium hydrogencarbonate?
Answer» What is the ph of sodium hydrogencarbonate?

Discussion

8212.	Are the reversible reactions are complete or incomplete?
Answer» Are the reversible reactions are complete or incomplete?

Discussion

8213.	Name : (a) the gas which is prepared by Haber's Process, (b) two gases which give dense white fumes with ammonia, (c) one salt of ammonia in each case which is used in : (i) dry cell (ii) explosives (iii) medicine, (d) an acidic gas which reacts with a basic gas liberating a neutral gas, (e) a metallic chloride soluble in ammonium hydroxide, (f) the gas obtained when ammoia burns in an atmosphere of oxygen without any catalyst, (g) a nitride of a divalent metal which reacts with warm water liberating ammonia, (h) an amphoteric oxide reduced by the basic gas, (i) a white salt produced by an acid gas and a basic gas.
Answer» Name : (a) the gas which is prepared by Haber's Process, (b) two gases which give dense white fumes with ammonia, (c) one salt of ammonia in each case which is used in : (i) dry cell (ii) explosives (iii) medicine, (d) an acidic gas which reacts with a basic gas liberating a neutral gas, (e) a metallic chloride soluble in ammonium hydroxide, (f) the gas obtained when ammoia burns in an atmosphere of oxygen without any catalyst, (g) a nitride of a divalent metal which reacts with warm water liberating ammonia, (h) an amphoteric oxide reduced by the basic gas, (i) a white salt produced by an acid gas and a basic gas.

8213.

Name : (a) the gas which is prepared by Haber's Process, (b) two gases which give dense white fumes with ammonia, (c) one salt of ammonia in each case which is used in : (i) dry cell (ii) explosives (iii) medicine, (d) an acidic gas which reacts with a basic gas liberating a neutral gas, (e) a metallic chloride soluble in ammonium hydroxide, (f) the gas obtained when ammoia burns in an atmosphere of oxygen without any catalyst, (g) a nitride of a divalent metal which reacts with warm water liberating ammonia, (h) an amphoteric oxide reduced by the basic gas, (i) a white salt produced by an acid gas and a basic gas.

Answer»

Name :

(a) the gas which is prepared by Haber's Process,

(b) two gases which give dense white fumes with ammonia,

(c) one salt of ammonia in each case which is used in :

(i) dry cell (ii) explosives (iii) medicine,

(d) an acidic gas which reacts with a basic gas liberating a neutral gas,

(e) a metallic chloride soluble in ammonium hydroxide,

(f) the gas obtained when ammoia burns in an atmosphere of oxygen without any catalyst,

(g) a nitride of a divalent metal which reacts with warm water liberating ammonia,

(h) an amphoteric oxide reduced by the basic gas,

(i) a white salt produced by an acid gas and a basic gas.

Discussion

8214.	38. The correct order of (C-O)bond length among CO, carbonate ion , carbon dioxide
Answer» 38. The correct order of (C-O)bond length among CO, carbonate ion , carbon dioxide

Discussion

8215.	Three test tubes contain calcium nitrate solution, zinc nitrate solution and lead nitrate solution respectively. Each solution is divided into two portions (i) and (ii). Describe the effect of(i) adding sodium hydroxide solution to each portion in turn till it is in excess.(ii) adding ammonium hydroxide to each portion in turn till it is in excess.
Answer» Three test tubes contain calcium nitrate solution, zinc nitrate solution and lead nitrate solution respectively. Each solution is divided into two portions (i) and (ii). Describe the effect of (i) adding sodium hydroxide solution to each portion in turn till it is in excess. (ii) adding ammonium hydroxide to each portion in turn till it is in excess.

Discussion

8216.	What do you mean by water of crystallisation of a substance?
Answer» What do you mean by water of crystallisation of a substance?

Discussion

8217.	Explain the example of the heating effect of electric current
Answer» Explain the example of the heating effect of electric current

Discussion

8218.	Differentiate between electrical conductivity of copper sulphate solution and copper metal.
Answer» Differentiate between electrical conductivity of copper sulphate solution and copper metal.

Discussion

8219.	Identify X in the given reaction.
Answer» Identify X in the given reaction.

8219.

Identify X in the given reaction.

Answer»

Identify X in the given reaction.

Discussion

8220.	what is the VSPR theory for bond angle ?
Answer» what is the VSPR theory for bond angle ?

Discussion

8221.	among the following compounds of nitrogen ,choose the richest source of nitrogen a)NH2CONH2 b)NH2-NH2 c)NH4NO3 d)HNC(NH_2)2
Answer» among the following compounds of nitrogen ,choose the richest source of nitrogen a)NH2CONH2 b)NH2-NH2 c)NH4NO3 d)HNC(NH_2)2

Discussion

8222.	Vapour density of a gas is 8. Its molecular mass willbe
Answer» Vapour density of a gas is 8. Its molecular mass willbe

Discussion

8223.	State two properties of carbon due to which it forms millions of compounds.
Answer» State two properties of carbon due to which it forms millions of compounds.

Discussion

8224.	Which one of the following salts on dissolution in water will give a solution of pH less than 7 at 298 K?
Answer» Which one of the following salts on dissolution in water will give a solution of pH less than 7 at 298 K?

Discussion

8225.	(a) Calculate the number of moles and the number of molecules present in 1.4 g of ethylene gas. What is the volume occupied by the same amount of ethylene? (b) What is the vapour density of ethylene?
Answer» (a) Calculate the number of moles and the number of molecules present in 1.4 g of ethylene gas. What is the volume occupied by the same amount of ethylene? (b) What is the vapour density of ethylene?

Discussion

8226.	17. Choose the correct regarding indicator Titration Indicator (1) NaOH vs. CH3COOH Phenolphthalein (2) KMnO4 vs. FeCZO4 KMnO4 (3) l2 vs. Na28203 Starch (4) K2Cr207 vs. FeSO4 K3[Fe(CN)6] as external
Answer» 17. Choose the correct regarding indicator Titration Indicator (1) NaOH vs. CH3COOH Phenolphthalein (2) KMnO4 vs. FeCZO4 KMnO4 (3) l2 vs. Na28203 Starch (4) K2Cr207 vs. FeSO4 K3[Fe(CN)6] as external

Discussion

8227.	The preparation of water from hydrogen and oxygen gas is accompanied by:
Answer» The preparation of water from hydrogen and oxygen gas is accompanied by:

Discussion

8228.	A milkman adds a very small amount of baking soda to fresh milk. 1)why does he shift the ph of the fresh milk from 6 to slightly alkaline? 2)why does thisilk take long time to set as curd
Answer» A milkman adds a very small amount of baking soda to fresh milk. 1)why does he shift the ph of the fresh milk from 6 to slightly alkaline? 2)why does thisilk take long time to set as curd

8228.

A milkman adds a very small amount of baking soda to fresh milk. 1)why does he shift the ph of the fresh milk from 6 to slightly alkaline? 2)why does thisilk take long time to set as curd

Answer»

A milkman adds a very small amount of baking soda to fresh milk.

1)why does he shift the ph of the fresh milk from 6 to slightly alkaline?

2)why does thisilk take long time to set as curd

Discussion

8229.	In a CO molecule, the distance between C (mass = 12 a.m.u.) and O (mass = 16 a.m.u.), where 1 a.m.u. =53×1027 kg, is close to
Answer» In a CO molecule, the distance between C (mass = 12 a.m.u.) and O (mass = 16 a.m.u.), where 1 a.m.u. $= \frac{5}{3} \times 10^{27} k g$ , is close to

Discussion

8230.	Why Zn is not called transitional element?
Answer» Why Zn is not called transitional element?

Discussion

8231.	The following concentration were obtained for the formation of NH3 form N2 and H2 at equilibrium for the reaction N2(g)+3H2(g)⇌2NH3(g)[N2]=1.5×10−2M[H2]=3.0×10−2M[NH3]=1.2×10−2MCalculate equilibrium constant.
Answer» The following concentration were obtained for the formation of $N H_{3}$ form $N_{2}$ and $H_{2}$ at equilibrium for the reaction $N_{2} (g) + 3 H_{2} (g) ⇌ 2 N H_{3} (g)$ $[N_{2}] = 1.5 \times 10^{- 2} M$ $[H_{2}] = 3.0 \times 10^{- 2} M$ $[N H_{3}] = 1.2 \times 10^{- 2} M$ Calculate equilibrium constant.

Discussion

8232.	What is the number of elements in the 1st and 3rd period of the modern periodic table ?
Answer» What is the number of elements in the 1st and 3rd period of the modern periodic table ?

Discussion

8233.	Application of heating effect of current.
Answer» Application of heating effect of current.

Discussion

8234.	Ammonia cannot be collected over water. Give reasons.
Answer» Ammonia cannot be collected over water. Give reasons.

Discussion

8235.	Is diamond, which shines, a metal?
Answer» Is diamond, which shines, a metal?

Discussion

8236.	H.V.Z reaction involves the use of P and Cl2CH3CH2COOHP,Cl2−−−→CH3CHClCOOH The function of phosphorus is
Answer» H.V.Z reaction involves the use of P and $C l_{2}$ $C H_{3} C H_{2} C O O H P, C l_{2} - -- \to C H_{3} C H C l C O O H$ The function of phosphorus is

Discussion

8237.	Which of the following atoms will have the smallest size?
Answer» Which of the following atoms will have the smallest size?

Discussion

8238.	612C,614C,616C differ in number of __________.
Answer» $_{12}^{6} C,_{14}^{6} C,_{16}^{6} C$ differ in number of __________.

Discussion

8239.	(a) What are the main applications of Avogadro's law?(b) How does Avogadro's law explain Gay-Lussac's law of combining volumes?
Answer» (a) What are the main applications of Avogadro's law? (b) How does Avogadro's law explain Gay-Lussac's law of combining volumes?

Discussion

8240.	(a) What happens chemically when quicklime is added to water? Write chemical equation of the reaction involved.(b) What is 'Baking Powder'? How does it make the cake soft and spongy?
Answer» (a) What happens chemically when quicklime is added to water? Write chemical equation of the reaction involved. (b) What is 'Baking Powder'? How does it make the cake soft and spongy?

Discussion

8241.	What is decomposition reaction. Give three examples.
Answer» What is decomposition reaction. Give three examples.

Discussion

8242.	Why zn ions lie in 50% of the tetrahedral voids why not 100%?
Answer» Why zn ions lie in 50% of the tetrahedral voids why not 100%?

Discussion

8243.	(i) Draw a labelled diagram and explain the laboratory preparation of hydrogen chloride gas. Give the balanced equations.(ii) How will you prove that the gas prepared is HCl?(iii) Name the drying agent used to dry HCl gas.(iv) How is the gas collected and why?(v) What are the important precautions?
Answer» (i) Draw a labelled diagram and explain the laboratory preparation of hydrogen chloride gas. Give the balanced equations. (ii) How will you prove that the gas prepared is HCl? (iii) Name the drying agent used to dry HCl gas. (iv) How is the gas collected and why? (v) What are the important precautions?

Discussion

8244.	What happens to the temperature of beaker in which reaction is happeneing in exothermic and endothermic reactions respectively ? In which one it rises and.in which one it dips?
Answer» What happens to the temperature of beaker in which reaction is happeneing in exothermic and endothermic reactions respectively ? In which one it rises and.in which one it dips?

Discussion

8245.	A hydrocarbon contains 10.5 g of carbon per 1 g of H. One litre vapours of hydrocarbon with molar mass 92 at 127∘C and 1 atm pressure weighs 2.8 g. Find molecular formula of hydrocarbon.
Answer» A hydrocarbon contains 10.5 g of carbon per 1 g of H. One litre vapours of hydrocarbon with molar mass 92 at $127^{\circ}$ C and 1 atm pressure weighs 2.8 g. Find molecular formula of hydrocarbon.

Discussion

8246.	21. Why phosphorus doesn't form p2 explain
Answer» 21. Why phosphorus doesn't form p2 explain

Discussion

8247.	What do you mean by balanced chemical equation?
Answer» What do you mean by balanced chemical equation?

Discussion

8248.	(a) Why is sodium kept immersed in kerosene oil? (b) Why is white phosphorus kept immersed under water? (c) Can we keep sodium immersed under water? Why?
Answer» (a) Why is sodium kept immersed in kerosene oil? (b) Why is white phosphorus kept immersed under water? (c) Can we keep sodium immersed under water? Why?

Discussion

8249.	What is the enthalpy of neutralisation of HFagainst a strong base ?H (aq) + OH (aq.) → H2O(l);; Δ r H = −56 kJ/molΔ f H(HF,aq) = −329 kJ/mol;Δ f H(H2O(l)) = −285 kJ/mol;Δ f H(F ,aq.) = −320 kJ/mol(1) –17 kJ/mol (2) –38 kJ/mol(3) –47 kJ/mol (4) –43 kJ/mol
Answer» What is the enthalpy of neutralisation of HF against a strong base ? H (aq) + OH (aq.) → H2O(l);; Δ r H = −56 kJ/mol Δ f H(HF,aq) = −329 kJ/mol; Δ f H(H2O(l)) = −285 kJ/mol; Δ f H(F ,aq.) = −320 kJ/mol (1) –17 kJ/mol (2) –38 kJ/mol (3) –47 kJ/mol (4) –43 kJ/mol

Discussion

8250.	(a) Name two gases which combine chemically to form a solid.(b) Name a chloride which is soluble in excess of ammonium hydroxide.(c) How will you show that hydrochloric acid contains both hydrogen and chlorine (other than by electrolysis)?(d) Complete and balance the following equations:KMnO4 + HCl → _______ + _______ + ________ + 8H 2O
Answer» (a) Name two gases which combine chemically to form a solid. (b) Name a chloride which is soluble in excess of ammonium hydroxide. (c) How will you show that hydrochloric acid contains both hydrogen and chlorine (other than by electrolysis)? (d) Complete and balance the following equations: KMnO₄ + HCl $\overset{}{\to}$ _______ + _______ + ________ + 8H ₂O

Discussion

Explore topic-wise InterviewSolutions in .

A compound X on heating gives a colourless gas. The residue is dissolved in water to give Y. To the aqueous solution of Y, CO2 is passed and it produces Z, which on gentle heating gives back X. Compound X is:

How many years it would take to spend Avogadro's number of rupees at the rate of 1 million rupees in one second?

What is the result when Copper(||)oxide is heated?

Statement:Should all the unauthorized structures in the city be demolished? Argument: I. No, where will the people residing in such houses live? II. Yes, this will give a clear message to the general public and they will refrain from constructing unauthorized buildings.

In the following sequence of reactions identify product ‘X’

2. The correct order increasing of lattice energies of the following ionic compounds is Al2O3,CaO,MgCl2,NaCl

A compound contains 69.5% oxygen and 30.5% nitrogen and its molecular mass is 92g/mol. The formula of that compound is:

Which of the following is not a property of aluminium?

Write the equation for the following laboratory preparations:(i) Ethane from sodium propionate.(ii) Ethene from iodoethane.(iii) Ethyne from calcium carbide.

The process in which the surface of the metals is cleaned by a chemical is called

What is the ph of sodium hydrogencarbonate?

Are the reversible reactions are complete or incomplete?

38. The correct order of (C-O)bond length among CO, carbonate ion , carbon dioxide

What do you mean by water of crystallisation of a substance?

Explain the example of the heating effect of electric current

Differentiate between electrical conductivity of copper sulphate solution and copper metal.

Identify X in the given reaction.

what is the VSPR theory for bond angle ?

among the following compounds of nitrogen ,choose the richest source of nitrogen a)NH2CONH2 b)NH2-NH2 c)NH4NO3 d)HNC(NH_2)2

Vapour density of a gas is 8. Its molecular mass willbe

State two properties of carbon due to which it forms millions of compounds.

Which one of the following salts on dissolution in water will give a solution of pH less than 7 at 298 K?

(a) Calculate the number of moles and the number of molecules present in 1.4 g of ethylene gas. What is the volume occupied by the same amount of ethylene? (b) What is the vapour density of ethylene?

17. Choose the correct regarding indicator Titration Indicator (1) NaOH vs. CH3COOH Phenolphthalein (2) KMnO4 vs. FeCZO4 KMnO4 (3) l2 vs. Na28203 Starch (4) K2Cr207 vs. FeSO4 K3[Fe(CN)6] as external

The preparation of water from hydrogen and oxygen gas is accompanied by:

A milkman adds a very small amount of baking soda to fresh milk. 1)why does he shift the ph of the fresh milk from 6 to slightly alkaline? 2)why does thisilk take long time to set as curd

In a CO molecule, the distance between C (mass = 12 a.m.u.) and O (mass = 16 a.m.u.), where 1 a.m.u. =53×1027 kg, is close to

Why Zn is not called transitional element?

The following concentration were obtained for the formation of NH3 form N2 and H2 at equilibrium for the reaction N2(g)+3H2(g)⇌2NH3(g)[N2]=1.5×10−2M[H2]=3.0×10−2M[NH3]=1.2×10−2MCalculate equilibrium constant.

What is the number of elements in the 1st and 3rd period of the modern periodic table ?

Application of heating effect of current.

Ammonia cannot be collected over water. Give reasons.

Is diamond, which shines, a metal?

H.V.Z reaction involves the use of P and Cl2CH3CH2COOHP,Cl2−−−→CH3CHClCOOH The function of phosphorus is

Which of the following atoms will have the smallest size?

612C,614C,616C differ in number of __________.

(a) What are the main applications of Avogadro's law?(b) How does Avogadro's law explain Gay-Lussac's law of combining volumes?

(a) What happens chemically when quicklime is added to water? Write chemical equation of the reaction involved.(b) What is 'Baking Powder'? How does it make the cake soft and spongy?

What is decomposition reaction. Give three examples.

Why zn ions lie in 50% of the tetrahedral voids why not 100%?

(i) Draw a labelled diagram and explain the laboratory preparation of hydrogen chloride gas. Give the balanced equations.(ii) How will you prove that the gas prepared is HCl?(iii) Name the drying agent used to dry HCl gas.(iv) How is the gas collected and why?(v) What are the important precautions?

What happens to the temperature of beaker in which reaction is happeneing in exothermic and endothermic reactions respectively ? In which one it rises and.in which one it dips?

A hydrocarbon contains 10.5 g of carbon per 1 g of H. One litre vapours of hydrocarbon with molar mass 92 at 127∘C and 1 atm pressure weighs 2.8 g. Find molecular formula of hydrocarbon.

21. Why phosphorus doesn't form p2 explain

What do you mean by balanced chemical equation?

(a) Why is sodium kept immersed in kerosene oil? (b) Why is white phosphorus kept immersed under water? (c) Can we keep sodium immersed under water? Why?

What is the enthalpy of neutralisation of HFagainst a strong base ?H (aq) + OH (aq.) → H2O(l);; Δ r H = −56 kJ/molΔ f H(HF,aq) = −329 kJ/mol;Δ f H(H2O(l)) = −285 kJ/mol;Δ f H(F ,aq.) = −320 kJ/mol(1) –17 kJ/mol (2) –38 kJ/mol(3) –47 kJ/mol (4) –43 kJ/mol