15280 + Interview Questions in Chemistry Page 299 InterviewSolution

14901.	Discolouration of 'Taj mahal' marbles is due to
Answer» Discolouration of 'Taj mahal' marbles is due to

Discussion

14902.	How is litmus paper formed?
Answer» How is litmus paper formed?

Discussion

14903.	Calculate the number of: (a) Particles in 0.1 moles of any substance, (b) Hydrogen atoms in 0.1 mole of H2SO4 (c) Molecules in one kg of calcium chloride.
Answer» Calculate the number of: (a) Particles in 0.1 moles of any substance, (b) Hydrogen atoms in 0.1 mole of $H_{2} S O_{4}$ (c) Molecules in one kg of calcium chloride.

Discussion

14904.	Name the gas in the air which tarnishes silver articles slowly.
Answer» Name the gas in the air which tarnishes silver articles slowly.

Discussion

14905.	1.Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCL) is added to test tube A , while acetic acid (CH3COOH) is added to test tube B.In which test tube will the fizzing occur more vigorously and why?
Answer» 1.Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCL) is added to test tube A , while acetic acid (CH₃COOH) is added to test tube B.In which test tube will the fizzing occur more vigorously and why?

Discussion

14906.	Why it has been suggested that we should plant eucalyptus trees all along sewage ponds? Now explain what are the alternate low cost arrangements that exists for sewage disposal? [5 MARKS]
Answer» Why it has been suggested that we should plant eucalyptus trees all along sewage ponds? Now explain what are the alternate low cost arrangements that exists for sewage disposal? [5 MARKS]

Discussion

14907.	What is the effect of temperature on: 1. Molarity 2. Mole fraction
Answer» What is the effect of temperature on: 1. Molarity 2. Mole fraction

14907.

What is the effect of temperature on: 1. Molarity 2. Mole fraction

Answer»

What is the effect of temperature on:

1. Molarity

2. Mole fraction

Discussion

14908.	The action of heat on the blue crystalline solid A, gives a reddish brown gas B, a gas which re-lights a glowing splint and leaves a black residue. When gas C, which has a rotten egg smell, is passed through a solution of A, a black ppt. is formed. (a) Identify A, B and C (b) Write an equation for the action of heat on A. (c) Write equation between solution of A and gas C. [5 MARKS]
Answer» The action of heat on the blue crystalline solid A, gives a reddish brown gas B, a gas which re-lights a glowing splint and leaves a black residue. When gas C, which has a rotten egg smell, is passed through a solution of A, a black ppt. is formed. (a) Identify A, B and C (b) Write an equation for the action of heat on A. (c) Write equation between solution of A and gas C. [5 MARKS]

Discussion

14909.	(a) State Mendeleev’s periodic law. (b) What were the chemical properties of elements used by Mendeleev in creating his periodic table? (c) State any three limitations of Mendeleev’s classification of elements. (d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table? (e) Which group of elements was missing from Mendeleev’s original periodic table?
Answer» (a) State Mendeleev’s periodic law. (b) What were the chemical properties of elements used by Mendeleev in creating his periodic table? (c) State any three limitations of Mendeleev’s classification of elements. (d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table? (e) Which group of elements was missing from Mendeleev’s original periodic table?

14909.

(a) State Mendeleev’s periodic law. (b) What were the chemical properties of elements used by Mendeleev in creating his periodic table? (c) State any three limitations of Mendeleev’s classification of elements. (d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table? (e) Which group of elements was missing from Mendeleev’s original periodic table?

Answer»

(a) State Mendeleev’s periodic law.

(b) What were the chemical properties of elements used by Mendeleev in creating his periodic table?

(c) State any three limitations of Mendeleev’s classification of elements.

(d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table?

(e) Which group of elements was missing from Mendeleev’s original periodic table?

Discussion

14910.	For one mole of a Van der Waals gas when b = 0 and T = 300 K, then pV vs. 1V plot is shown in figure. The value of the Van der Waals constant "a" (atm L2 mol−2)is___.
Answer» For one mole of a Van der Waals gas when b = 0 and T = 300 K, then pV vs. $\frac{1}{V}$ plot is shown in figure. The value of the Van der Waals constant "a" $(a t m L^{2} m o l^{- 2}$ )is___.

14910.

For one mole of a Van der Waals gas when b = 0 and T = 300 K, then pV vs. 1V plot is shown in figure. The value of the Van der Waals constant "a" (atm L2 mol−2)is___.

Answer»

For one mole of a Van der Waals gas when b = 0 and T = 300 K, then pV vs. $\frac{1}{V}$ plot is shown in figure. The value of the Van der Waals constant "a" $(a t m L^{2} m o l^{- 2}$ )is___.

Discussion

14911.	Use of mild base like baking soda on the honey bee stung area gives relief . why ??
Answer» Use of mild base like baking soda on the honey bee stung area gives relief . why ??

Discussion

14912.	Mr. A started business with a capital Rs. 5,00,000. At the end of the year his position was- ItemsAmt. (Rs.)Cash in hand15,000Cash at bank70,000Sundry debtors1,20,000Stock2,40,000Furniture75,000Machinery2,00,000 Sundry creditors on this date totalled Rs. 80,000. During the year, he introduced a further capital of Rs. 1,50,000 and withdrew for household expenses Rs. 90,000. You are required to calculate profit or loss during the year.
Answer» Mr. A started business with a capital Rs. 5,00,000. At the end of the year his position was- $\begin{matrix} Items & Amt. (Rs.) Cash in hand & 15, 000 Cash at bank & 70, 000 Sundry debtors & 1, 20, 000 Stock & 2, 40, 000 Furniture & 75, 000 Machinery & 2, 00, 000 \end{matrix}$ Sundry creditors on this date totalled Rs. 80,000. During the year, he introduced a further capital of Rs. 1,50,000 and withdrew for household expenses Rs. 90,000. You are required to calculate profit or loss during the year.

14912.

Mr. A started business with a capital Rs. 5,00,000. At the end of the year his position was- ItemsAmt. (Rs.)Cash in hand15,000Cash at bank70,000Sundry debtors1,20,000Stock2,40,000Furniture75,000Machinery2,00,000 Sundry creditors on this date totalled Rs. 80,000. During the year, he introduced a further capital of Rs. 1,50,000 and withdrew for household expenses Rs. 90,000. You are required to calculate profit or loss during the year.

Answer»

Mr. A started business with a capital Rs. 5,00,000. At the end of the year his position was-

$\begin{matrix} Items & Amt. (Rs.) Cash in hand & 15, 000 Cash at bank & 70, 000 Sundry debtors & 1, 20, 000 Stock & 2, 40, 000 Furniture & 75, 000 Machinery & 2, 00, 000 \end{matrix}$

Sundry creditors on this date totalled Rs. 80,000. During the year, he introduced a further capital of Rs. 1,50,000 and withdrew for household expenses Rs. 90,000.

You are required to calculate profit or loss during the year.

Discussion

14913.	On 15th April, 2012, B accepted three bills of exchange for Rs 2,400: first bill for Rs 700 for one month; second bill for Rs 800 for two months; and third bill for Rs 900 for three months duly written by A. On 20th April, 2012, A endorsed the first bill to his creditor C to clear his account of Rs 710 and discounted the second bill on 22nd April with his bankers for Rs 792. The third bill was retained by A till maturity. The first bill was met on maturity but the second bill was dishonoured on due date. Bank paid Rs 10 for noting charges. A charges B Rs 15 for interest and drew on him a fourth bill for Rs 825 for three months and B accepted it and returned. Bill No.3 and 4 were met on maturity. Pass necessary Journal entries in the books of 'A'.
Answer» On 15th April, 2012, B accepted three bills of exchange for Rs 2,400: first bill for Rs 700 for one month; second bill for Rs 800 for two months; and third bill for Rs 900 for three months duly written by A. On 20th April, 2012, A endorsed the first bill to his creditor C to clear his account of Rs 710 and discounted the second bill on 22nd April with his bankers for Rs 792. The third bill was retained by A till maturity. The first bill was met on maturity but the second bill was dishonoured on due date. Bank paid Rs 10 for noting charges. A charges B Rs 15 for interest and drew on him a fourth bill for Rs 825 for three months and B accepted it and returned. Bill No.3 and 4 were met on maturity. Pass necessary Journal entries in the books of 'A'.

14913.

On 15th April, 2012, B accepted three bills of exchange for Rs 2,400: first bill for Rs 700 for one month; second bill for Rs 800 for two months; and third bill for Rs 900 for three months duly written by A. On 20th April, 2012, A endorsed the first bill to his creditor C to clear his account of Rs 710 and discounted the second bill on 22nd April with his bankers for Rs 792. The third bill was retained by A till maturity. The first bill was met on maturity but the second bill was dishonoured on due date. Bank paid Rs 10 for noting charges. A charges B Rs 15 for interest and drew on him a fourth bill for Rs 825 for three months and B accepted it and returned. Bill No.3 and 4 were met on maturity. Pass necessary Journal entries in the books of 'A'.

Answer»

On 15th April, 2012, B accepted three bills of exchange for Rs 2,400: first bill for Rs 700 for one month; second bill for Rs 800 for two months; and third bill for Rs 900 for three months duly written by A.

On 20th April, 2012, A endorsed the first bill to his creditor C to clear his account of Rs 710 and discounted the second bill on 22nd April with his bankers for Rs 792. The third bill was retained by A till maturity.

The first bill was met on maturity but the second bill was dishonoured on due date. Bank paid Rs 10 for noting charges. A charges B Rs 15 for interest and drew on him a fourth bill for Rs 825 for three months and B accepted it and returned. Bill No.3 and 4 were met on maturity. Pass necessary Journal entries in the books of 'A'.

Discussion

14914.	Name two waste materials which can be recycled.
Answer» Name two waste materials which can be recycled.

Discussion

14915.	Write the molecular formula of (i) an alkane (ii) an alkene, and (iii) an alkyne, each having 20 carbon atoms.
Answer» Write the molecular formula of (i) an alkane (ii) an alkene, and (iii) an alkyne, each having 20 carbon atoms.

Discussion

14916.	give 2 egs from everyday life situations where redox reaction takes place
Answer» give 2 egs from everyday life situations where redox reaction takes place

Discussion

14917.	Functional group
Answer» Functional group

Discussion

14918.	How do you electrify an object by the method of friction?
Answer» How do you electrify an object by the method of friction?

Discussion

14919.	Why ionic compounds are soluble in water but insoluble in organic solvents?
Answer» Why ionic compounds are soluble in water but insoluble in organic solvents?

Discussion

14920.	Which of the following is not the characteristic feature of saturated organic compounds?
Answer» Which of the following is not the characteristic feature of saturated organic compounds?

Discussion

14921.	When a piece of Pb is kept in a blue coloured copper sulphate solution the colour of lead changes due to the depostion of copper. What type of reaction is this?
Answer» When a piece of Pb is kept in a blue coloured copper sulphate solution the colour of lead changes due to the depostion of copper. What type of reaction is this?

Discussion

14922.	Question 9 What does one mean by exothermic and endothermic reactions? Give examples.
Answer» Question 9 What does one mean by exothermic and endothermic reactions? Give examples.

Discussion

14923.	Question 3(i) Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows: MetalIron(II)sulphateCopper(II)sulphateZinc sulphateSilver nitrateA.No reactionDisplacementB.DisplacementNo reactionC.No reactionNo reactionNo reactionDisplacementD.No reactionNo reactionNo reactionNo reaction Use the table above to answer the following questions about metals A, B, C and D. (i) Which is the most reactive metal?
Answer» Question 3(i) Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows: $\begin{matrix} M e t a l & I r o n (I I) s u l p h a t e & C o p p e r (I I) s u l p h a t e & Z i n c s u l p h a t e & S i l v e r n i t r a t e A . & N o r e a c t i o n & D i s p l a c e m e n t B . & D i s p l a c e m e n t & N o r e a c t i o n C . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & D i s p l a c e m e n t D . & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n & N o r e a c t i o n \end{matrix}$ Use the table above to answer the following questions about metals A, B, C and D. (i) Which is the most reactive metal?

Discussion

14924.	Metal oxides which react with both acids as well as bases, to produce salt and water are known as ___.
Answer» Metal oxides which react with both acids as well as bases, to produce salt and water are known as ___.

Discussion

14925.	Name one chemical compound which can be used to distinguish between ethanol and ethanoic acid.
Answer» Name one chemical compound which can be used to distinguish between ethanol and ethanoic acid.

Discussion

14926.	What is X in this reaction ?CH3COONa+NaOH→X+Na2CO3
Answer» What is X in this reaction ? $C H_{3} C O O N a + N a O H \to X + N a_{2} C O_{3}$

Discussion

14927.	Among halogens, __has the smallest atomic radius.
Answer» Among halogens, __has the smallest atomic radius.

Discussion

14928.	Explain how harmful ultraviolet radiations of sunlight are prevented from reaching the earth's surface.
Answer» Explain how harmful ultraviolet radiations of sunlight are prevented from reaching the earth's surface.

Discussion

14929.	State the use of cast iron, wrought iron, mild steel, hard steel.
Answer» State the use of cast iron, wrought iron, mild steel, hard steel.

Discussion

14930.	Why is there a need to write the state of the compund in a chemical equation?
Answer» Why is there a need to write the state of the compund in a chemical equation?

Discussion

14931.	Why does carbon form compounds mainly by covalent bonding?
Answer» Why does carbon form compounds mainly by covalent bonding?

Discussion

14932.	An unknown substance A reacts with sodium hydrogen carbonate to produce sodium acetate, substance B and carbon dioxide. Predict both substance A and B. A + NaHCO3 → CH3COONa + B + CO2
Answer» An unknown substance A reacts with sodium hydrogen carbonate to produce sodium acetate, substance B and carbon dioxide. Predict both substance A and B. A + NaHCO₃ → CH₃COONa + B + CO₂

Discussion

14933.	What happens to the solubility in an exothermic process in regard to temperature?
Answer» What happens to the solubility in an exothermic process in regard to temperature?

Discussion

14934.	Corrosion is a ___ reaction.
Answer» Corrosion is a ___ reaction.

Discussion

14935.	Which of the following anion is orange in colour?
Answer» Which of the following anion is orange in colour?

Discussion

14936.	Select the salts out of the following elements: 1. HCl 2. NaCl 3. Cu(OH)2 4. CuSO4 5.CH3COOH 6. CH3COONa 7. Na2SO4 8. H2SO4 9.Ca(OH)2 10. CaCl2
Answer» Select the salts out of the following elements: 1. HCl 2. NaCl 3. ${C u (O H)}_{2}$ 4. ${C u S O}_{4}$ 5. ${C H}_{3} C O O H$ 6. ${C H}_{3} C O O N a$ 7. ${N a}_{2} {S O}_{4}$ 8. $H_{2} {S O}_{4}$ 9. ${C a (O H)}_{2}$ 10. ${C a C l}_{2}$

14936.

Select the salts out of the following elements: 1. HCl 2. NaCl 3. Cu(OH)2 4. CuSO4 5.CH3COOH 6. CH3COONa 7. Na2SO4 8. H2SO4 9.Ca(OH)2 10. CaCl2

Answer»

Select the salts out of the following elements:

1. HCl 2. NaCl 3. ${C u (O H)}_{2}$ 4. ${C u S O}_{4}$ 5. ${C H}_{3} C O O H$

6. ${C H}_{3} C O O N a$ 7. ${N a}_{2} {S O}_{4}$ 8. $H_{2} {S O}_{4}$ 9. ${C a (O H)}_{2}$ 10. ${C a C l}_{2}$

Discussion

14937.	Calculate the percentage composition of nitrogen in NH4NO3.
Answer» Calculate the percentage composition of nitrogen in $N H_{4} N O_{3} .$

Discussion

14938.	What is meant in the periodic table by : (a) a group, and (b) a period ?
Answer» What is meant in the periodic table by : (a) a group, and (b) a period ?

14938.

What is meant in the periodic table by : (a) a group, and (b) a period ?

Answer»

What is meant in the periodic table by :

(a) a group, and

(b) a period ?

Discussion

14939.	The oxides of which of the following metals can be reduced to metals by heating:
Answer» The oxides of which of the following metals can be reduced to metals by heating:

Discussion

14940.	What is the importance of decomposers in the forest?
Answer» What is the importance of decomposers in the forest?

Discussion

14941.	Distinguish between : (a) a mineral and an ore, (b) an ore and a metallic compound.
Answer» Distinguish between : (a) a mineral and an ore, (b) an ore and a metallic compound.

14941.

Distinguish between : (a) a mineral and an ore, (b) an ore and a metallic compound.

Answer»

Distinguish between :

(a) a mineral and an ore,

(b) an ore and a metallic compound.

Discussion

14942.	112 cm of H2S (g) is mixed with 120cm3 (g) at STP to produce HCl(g) and sulphur (s). Write a balanced Equation for this reaction and calculate (i) the volume of gaseous product formed (ii) composition of the resulting mixture.
Answer» 112 cm of $H_{2} S$ (g) is mixed with $120 c m^{3}$ (g) at STP to produce HCl(g) and sulphur (s). Write a balanced Equation for this reaction and calculate (i) the volume of gaseous product formed (ii) composition of the resulting mixture.

14942.

112 cm of H2S (g) is mixed with 120cm3 (g) at STP to produce HCl(g) and sulphur (s). Write a balanced Equation for this reaction and calculate (i) the volume of gaseous product formed (ii) composition of the resulting mixture.

Answer»

112 cm of $H_{2} S$ (g) is mixed with $120 c m^{3}$ (g) at STP to produce HCl(g) and sulphur (s).

Write a balanced Equation for this reaction and calculate (i) the volume of gaseous product formed (ii) composition of the resulting mixture.

Discussion

14943.	(a) Name the common refrigerent. How does it deplete ozone layer ? (b) What is the alternative of chlorofluoro carbon ? (c) State the advantages and disadvantages of using ammonia as refrigerent ?
Answer» (a) Name the common refrigerent. How does it deplete ozone layer ? (b) What is the alternative of chlorofluoro carbon ? (c) State the advantages and disadvantages of using ammonia as refrigerent ?

14943.

(a) Name the common refrigerent. How does it deplete ozone layer ? (b) What is the alternative of chlorofluoro carbon ? (c) State the advantages and disadvantages of using ammonia as refrigerent ?

Answer»

(a) Name the common refrigerent. How does it deplete ozone layer ?

(b) What is the alternative of chlorofluoro carbon ?

(c) State the advantages and disadvantages of using ammonia as refrigerent ?

Discussion

14944.	Which of the following biphenyl is optically active?
Answer» Which of the following biphenyl is optically active?

Discussion

14945.	What is the odd one out: Brass, Steel, Stainless steel, Iron
Answer» What is the odd one out: Brass, Steel, Stainless steel, Iron

Discussion

14946.	What are the two types of eco-system?
Answer» What are the two types of eco-system?

Discussion

14947.	Pent-4-yn-2-ol has the structure?
Answer» Pent-4-yn-2-ol has the structure?

Discussion

14948.	What is dynamic equilibrium??
Answer» What is dynamic equilibrium??

Discussion

14949.	What is the chemical formula of magnesium nitride?
Answer» What is the chemical formula of magnesium nitride?

Discussion

14950.	Name a metal that is not attacked by cold water, boiling water or steam.
Answer» Name a metal that is not attacked by cold water, boiling water or steam.

Discussion

Explore topic-wise InterviewSolutions in .

Discolouration of 'Taj mahal' marbles is due to

How is litmus paper formed?

Calculate the number of: (a) Particles in 0.1 moles of any substance, (b) Hydrogen atoms in 0.1 mole of H2SO4 (c) Molecules in one kg of calcium chloride.

Name the gas in the air which tarnishes silver articles slowly.

1.Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCL) is added to test tube A , while acetic acid (CH3COOH) is added to test tube B.In which test tube will the fizzing occur more vigorously and why?

Why it has been suggested that we should plant eucalyptus trees all along sewage ponds? Now explain what are the alternate low cost arrangements that exists for sewage disposal? [5 MARKS]

What is the effect of temperature on: 1. Molarity 2. Mole fraction

For one mole of a Van der Waals gas when b = 0 and T = 300 K, then pV vs. 1V plot is shown in figure. The value of the Van der Waals constant "a" (atm L2 mol−2)is___.

Use of mild base like baking soda on the honey bee stung area gives relief . why ??

Name two waste materials which can be recycled.

Write the molecular formula of (i) an alkane (ii) an alkene, and (iii) an alkyne, each having 20 carbon atoms.

give 2 egs from everyday life situations where redox reaction takes place

Functional group

How do you electrify an object by the method of friction?

Why ionic compounds are soluble in water but insoluble in organic solvents?

Which of the following is not the characteristic feature of saturated organic compounds?

When a piece of Pb is kept in a blue coloured copper sulphate solution the colour of lead changes due to the depostion of copper. What type of reaction is this?

Question 9 What does one mean by exothermic and endothermic reactions? Give examples.

Metal oxides which react with both acids as well as bases, to produce salt and water are known as ___.

Name one chemical compound which can be used to distinguish between ethanol and ethanoic acid.

What is X in this reaction ?CH3COONa+NaOH→X+Na2CO3

Among halogens, __has the smallest atomic radius.

Explain how harmful ultraviolet radiations of sunlight are prevented from reaching the earth's surface.

State the use of cast iron, wrought iron, mild steel, hard steel.

Why is there a need to write the state of the compund in a chemical equation?

Why does carbon form compounds mainly by covalent bonding?

An unknown substance A reacts with sodium hydrogen carbonate to produce sodium acetate, substance B and carbon dioxide. Predict both substance A and B. A + NaHCO3 → CH3COONa + B + CO2

What happens to the solubility in an exothermic process in regard to temperature?

Corrosion is a ___ reaction.

Which of the following anion is orange in colour?

Select the salts out of the following elements: 1. HCl 2. NaCl 3. Cu(OH)2 4. CuSO4 5.CH3COOH 6. CH3COONa 7. Na2SO4 8. H2SO4 9.Ca(OH)2 10. CaCl2

Calculate the percentage composition of nitrogen in NH4NO3.

What is meant in the periodic table by : (a) a group, and (b) a period ?

The oxides of which of the following metals can be reduced to metals by heating:

What is the importance of decomposers in the forest?

Distinguish between : (a) a mineral and an ore, (b) an ore and a metallic compound.

112 cm of H2S (g) is mixed with 120cm3 (g) at STP to produce HCl(g) and sulphur (s). Write a balanced Equation for this reaction and calculate (i) the volume of gaseous product formed (ii) composition of the resulting mixture.

(a) Name the common refrigerent. How does it deplete ozone layer ? (b) What is the alternative of chlorofluoro carbon ? (c) State the advantages and disadvantages of using ammonia as refrigerent ?

Which of the following biphenyl is optically active?

What is the odd one out: Brass, Steel, Stainless steel, Iron

What are the two types of eco-system?

Pent-4-yn-2-ol has the structure?

What is dynamic equilibrium??

What is the chemical formula of magnesium nitride?

Name a metal that is not attacked by cold water, boiling water or steam.