15280 + Interview Questions in Chemistry Page 176 InterviewSolution

8751.	Explain why, carbon cannot reduce oxides of sodium or magnesium.
Answer» Explain why, carbon cannot reduce oxides of sodium or magnesium.

Discussion

8752.	Out of the following pairs of compounds, the unsaturated compounds are : (a) C2H6 and C4H6 (b) C6H12 and C5H12 (c) C4H6 and C6H12 (d) C2H6 and C4H10
Answer» Out of the following pairs of compounds, the unsaturated compounds are : (a) $C_{2} H_{6} a n d C_{4} H_{6}$ (b) $C_{6} H_{12} a n d C_{5} H_{12}$ (c) $C_{4} H_{6} a n d C_{6} H_{12}$ (d) $C_{2} H_{6} a n d C_{4} H_{10}$

Discussion

8753.	Match the following fractions with their equivalent fractional forms.
Answer» Match the following fractions with their equivalent fractional forms.

Discussion

8754.	Identify the reducing agent in the following chemical equation. 4NH3 + 5O2 → 4NO + 6H2O[1 mark]
Answer» Identify the reducing agent in the following chemical equation. $4 N H_{3} + 5 O_{2} \to 4 N O + 6 H_{2} O$ [1 mark]

Discussion

8755.	Define the term neutralisation : (a) Give a reaction, mentioning clearly acid and base used in the reaction (b) If one mole of a strong acid reacts with one mole of a strong base, the heat produced is always the same. Why?
Answer» Define the term neutralisation : (a) Give a reaction, mentioning clearly acid and base used in the reaction (b) If one mole of a strong acid reacts with one mole of a strong base, the heat produced is always the same. Why?

8755.

Define the term neutralisation : (a) Give a reaction, mentioning clearly acid and base used in the reaction (b) If one mole of a strong acid reacts with one mole of a strong base, the heat produced is always the same. Why?

Answer»

Define the term neutralisation :

(a) Give a reaction, mentioning clearly acid and base used in the reaction

(b) If one mole of a strong acid reacts with one mole of a strong base, the heat produced is always the same. Why?

Discussion

8756.

Match the following: Column A Column B 1. Acid salt 2. Mixed salt 3. Complex salt 4. Double salt 5. Normal salt (a) Sodium potassium carbonate (b) Alum (c) Sodium carbonate (d) Sodium zincate (e) Sodium hydrogen carbonate

Answer» Match the following:

Column A	Column B
1. Acid salt 2. Mixed salt 3. Complex salt 4. Double salt 5. Normal salt	(a) Sodium potassium carbonate (b) Alum (c) Sodium carbonate (d) Sodium zincate (e) Sodium hydrogen carbonate

Discussion

8757.	Calculate the weight of CO having same number of oxygen atoms as are present in 88 grams of CO2.
Answer» Calculate the weight of CO having same number of oxygen atoms as are present in 88 grams of CO2.

Discussion

8758.	What happens when methane and chlorine are exposed to direct sunlight.
Answer» What happens when methane and chlorine are exposed to direct sunlight.

Discussion

8759.	pH of 0.01M HCOONH4 aqueous solution changes 1)on increasing dilution 2)on decreasing dilution 3)on adding NaCl in small amount 4)on increasing temperature explain with reason
Answer» pH of 0.01M HCOONH4 aqueous solution changes 1)on increasing dilution 2)on decreasing dilution 3)on adding NaCl in small amount 4)on increasing temperature explain with reason

Discussion

8760.	54 The number of be localised Pi electrons in the given compound is 1)4 2)6 3)8 4)2
Answer» 54 The number of be localised Pi electrons in the given compound is 1)4 2)6 3)8 4)2

Discussion

8761.	You are given an organic compound having the molecular formula C3H8. Give the name and formula of the compound formed : (a) when one H atom of C3H8 is replaced by a Cl atom. (b) when one H atom of C3H8 is replaced by OH group. (c) when one H atom of C3H8 is replaced by a CHO group. (d) when one H atom of C3H8 is replaced by a COOH group. (e) when two H atoms jointed to the middle carbon atom of C3H8 are replaced by one O atom.
Answer» You are given an organic compound having the molecular formula $C_{3} H_{8}$ . Give the name and formula of the compound formed : (a) when one H atom of $C_{3} H_{8}$ is replaced by a Cl atom. (b) when one H atom of $C_{3} H_{8}$ is replaced by OH group. (c) when one H atom of $C_{3} H_{8}$ is replaced by a CHO group. (d) when one H atom of $C_{3} H_{8}$ is replaced by a COOH group. (e) when two H atoms jointed to the middle carbon atom of $C_{3} H_{8}$ are replaced by one O atom.

Discussion

8762.	The excessive exposure of humans to ultraviolet rays results in : (i) damage to immune system (iii) skin cancer (ii) damage to lungs (iv) peptic ulcers (a) (i) and (ii) (b) (ii) and (iv) (c) (i) and (iv) (d) (iii) and (iv)
Answer» The excessive exposure of humans to ultraviolet rays results in : (i) damage to immune system (iii) skin cancer (ii) damage to lungs (iv) peptic ulcers (a) (i) and (ii) (b) (ii) and (iv) (c) (i) and (iv) (d) (iii) and (iv)

8762.

The excessive exposure of humans to ultraviolet rays results in : (i) damage to immune system (iii) skin cancer (ii) damage to lungs (iv) peptic ulcers (a) (i) and (ii) (b) (ii) and (iv) (c) (i) and (iv) (d) (iii) and (iv)

Answer»

The excessive exposure of humans to ultraviolet rays results in :

(i) damage to immune system (iii) skin cancer

(ii) damage to lungs (iv) peptic ulcers

(a) (i) and (ii) (b) (ii) and (iv) (c) (i) and (iv) (d) (iii) and (iv)

Discussion

8763.	With respect to large-scale method of obtaining nitric acid, explain the following: [5 MARKS] (a) Excess air is taken in the reaction. (b) The gases entering the catalytic chamber must be pure. (c) The gases must be cooled before entering the oxidation chamber. (d) In the catalytic chamber, once the reaction starts, the external source of heat is removed.
Answer» With respect to large-scale method of obtaining nitric acid, explain the following: [5 MARKS] (a) Excess air is taken in the reaction. (b) The gases entering the catalytic chamber must be pure. (c) The gases must be cooled before entering the oxidation chamber. (d) In the catalytic chamber, once the reaction starts, the external source of heat is removed.

Discussion

8764.	What is the chemical formula for plaster of Paris? How is it prepared? State the common and the chemical names of the compound formed when plaster of Paris is mixed with water.
Answer» What is the chemical formula for plaster of Paris? How is it prepared? State the common and the chemical names of the compound formed when plaster of Paris is mixed with water.

Discussion

8765.	Under the normal conditions, which of the given oxides when reacted with water turns red litmus blue?
Answer» Under the normal conditions, which of the given oxides when reacted with water turns red litmus blue?

Discussion

8766.	The solution A and B are 0.1 and 0.2 molarin a substance. If 100 mL of A are mixed with 25 mL of B and there is no changein Volume on mixing then the final molarity of the solution is:
Answer» The solution A and B are 0.1 and 0.2 molar in a substance. If 100 mL of A are mixed with 25 mL of B and there is no change in Volume on mixing then the final molarity of the solution is:

Discussion

8767.	Choose the correct answer:The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white precipitate with barium chloride solution is:A. Iron (III) sulphateB. Iron (II) sulphateC. Iron (II) chlorideD. Iron (III) chloride
Answer» Choose the correct answer: The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white precipitate with barium chloride solution is: A. Iron (III) sulphate B. Iron (II) sulphate C. Iron (II) chloride D. Iron (III) chloride

Discussion

8768.	10. Four 1-1 litre flasks are separately filled with the gases H2, He, O2 & O3 at the same temperature and pressure. The ratio of total number of atoms of these gases present in different flask would be what?
Answer» 10. Four 1-1 litre flasks are separately filled with the gases H2, He, O2 & O3 at the same temperature and pressure. The ratio of total number of atoms of these gases present in different flask would be what?

Discussion

8769.	What will happen if a piece of diamond is dropped in fire? Write chemical equation for the reaction. [2 MARKS]
Answer» What will happen if a piece of diamond is dropped in fire? Write chemical equation for the reaction. [2 MARKS]

Discussion

8770.	Which of the following elements has maximum first ionization potential?
Answer» Which of the following elements has maximum first ionization potential?

8770.

Which of the following elements has maximum first ionization potential?

Answer»

Which of the following elements has maximum first ionization potential?

Discussion

8771.	49. Is geometry of all alkanes tetrahedral or only methane's geometry is tetrahedral.
Answer» 49. Is geometry of all alkanes tetrahedral or only methane's geometry is tetrahedral.

Discussion

8772.	If the temperature of the Sun were to increase from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received per unit area per unit time on earth to what it was previously, will be-1)4, 2)16, 3)32, 4)64.
Answer» If the temperature of the Sun were to increase from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received per unit area per unit time on earth to what it was previously, will be-1)4, 2)16, 3)32, 4)64.

Discussion

8773.	Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?
Answer» Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?

Discussion

8774.	A 50L cylinder is filled with argon gas to a pressure of 0130.0kPa at 30oC. How many moles of argon gas are in the cylinder?
Answer» A 50L cylinder is filled with argon gas to a pressure of 0130.0kPa at 30^oC. How many moles of argon gas are in the cylinder?

Discussion

8775.	A student took a sodium salt and dissolved it in water. When this aqueous sodium salt solution was tested with universal indicator paper, its pH was found to be 9.(a) What does pH 9 tell us about the sodium salt solution?(b) Name one sodium salt which can produce such a solution.
Answer» A student took a sodium salt and dissolved it in water. When this aqueous sodium salt solution was tested with universal indicator paper, its pH was found to be 9. (a) What does pH 9 tell us about the sodium salt solution? (b) Name one sodium salt which can produce such a solution.

Discussion

8776.	How will you convert(i) ethyne to ethane(ii) ethyne to acetaldehyde?
Answer» How will you convert (i) ethyne to ethane (ii) ethyne to acetaldehyde?

Discussion

8777.	If one mole of monoatomic gas is mixed with one mole of diatomic gas then the value of y(gamma) for mixture is (y=adiabatic exponent)
Answer» If one mole of monoatomic gas is mixed with one mole of diatomic gas then the value of y(gamma) for mixture is (y=adiabatic exponent)

Discussion

8778.	The second step in the production of sulphuric acid(contact process) is given by the equation:\(2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)\) Ideally, which conditions would increase the yield of this reaction?
Answer» The second step in the production of sulphuric acid(contact process) is given by the equation: \(2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)\) Ideally, which conditions would increase the yield of this reaction?

8778.

The second step in the production of sulphuric acid(contact process) is given by the equation:$2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)$ Ideally, which conditions would increase the yield of this reaction?

Answer»

The second step in the production of sulphuric acid(contact process) is given by the equation:

$2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)$

Ideally, which conditions would increase the yield of this reaction?

Discussion

8779.	22. Benzene is aromatic or not
Answer» 22. Benzene is aromatic or not

Discussion

8780.	Give balanced equations when : (a) ethene is burnt in excess of oxygen. (b) ethene reacts with chlorine. (c) ethene combines with hydrogen chloride. (d) a mixture of ethene and hydrogen is passed over nickel at 200∘C.
Answer» Give balanced equations when : (a) ethene is burnt in excess of oxygen. (b) ethene reacts with chlorine. (c) ethene combines with hydrogen chloride. (d) a mixture of ethene and hydrogen is passed over nickel at $200^{\circ} C$ .

Discussion

8781.	Which of the following anion gives a colourless solution?
Answer» Which of the following anion gives a colourless solution?

Discussion

8782.	What is the trend in solubility of carbonates, bicarbonates, nitrates, hydroxides of alkali and alkaline earth metals
Answer» What is the trend in solubility of carbonates, bicarbonates, nitrates, hydroxides of alkali and alkaline earth metals

Discussion

8783.	Identify the functional groups in the following: [3 MARKS] (i) CH3OH (ii) HCHO (iii) CH3COOH.
Answer» Identify the functional groups in the following: [3 MARKS] (i) $C H_{3} O H$ (ii) $H C H O$ (iii) $C H_{3} C O O H$ .

Discussion

8784.	why potential difference remains same in conductor connected in parallel
Answer» why potential difference remains same in conductor connected in parallel

Discussion

8785.	The apparent weight of wood floating on water if it weighs 100g in air is
Answer» The apparent weight of wood floating on water if it weighs 100g in air is

Discussion

8786.	Give four differences between organic and inorganic compounds.
Answer» Give four differences between organic and inorganic compounds.

Discussion

8787.	An acidic solution of ‘X’ does not give precipitate on passing H2S gas. ‘X’ gives a white precipitate when NH4OH is added to it. The white precipitate dissolves in excess of NaOHsolution. Pure ‘X’ fumes in air and dense white fumes are obtained when a glass rod dipped in NH4OH is held in the fumes. The compound ‘X’ is:
Answer» An acidic solution of ‘X’ does not give precipitate on passing $H_{2} S$ gas. ‘X’ gives a white precipitate when $N H_{4} O H$ is added to it. The white precipitate dissolves in excess of $N a O H$ solution. Pure ‘X’ fumes in air and dense white fumes are obtained when a glass rod dipped in $N H_{4} O H$ is held in the fumes. The compound ‘X’ is:

Discussion

8788.	Why is the symbol S for sulphur, but Na for sodium and Si for silicon ?
Answer» Why is the symbol S for sulphur, but Na for sodium and Si for silicon ?

Discussion

8789.	is molar mass is always similar to atomic mass, molecular mass and formulla mass ?
Answer» is molar mass is always similar to atomic mass, molecular mass and formulla mass ?

Discussion

8790.	What is the molecular formula of alcohol derived from butane.
Answer» What is the molecular formula of alcohol derived from butane.

Discussion

8791.	A mixture of oxygen and ethyne is burnt for welding but not a mixture of ethyne and air. Explain with reason.
Answer» A mixture of oxygen and ethyne is burnt for welding but not a mixture of ethyne and air. Explain with reason.

Discussion

8792.	Which organisms belong to third and fourth trophic levels in the food chain comprising the following? Rats, Plants, Hawk, Snakes
Answer» Which organisms belong to third and fourth trophic levels in the food chain comprising the following? Rats, Plants, Hawk, Snakes

Discussion

8793.	The total number of neutrons in di positive zinc ions with mass number 70 is
Answer» The total number of neutrons in di positive zinc ions with mass number 70 is

Discussion

8794.	Question 5(a) Which of the following methods is not used in preventing iron from rusting?1. Applying a coating of zinc2. Applying a coating of lead3. Applying paint4. Applying grease(b) Planting more trees in and around the industrial regions ensures good quality air. True or False?
Answer» Question 5 (a) Which of the following methods is not used in preventing iron from rusting? 1. Applying a coating of zinc 2. Applying a coating of lead 3. Applying paint 4. Applying grease (b) Planting more trees in and around the industrial regions ensures good quality air. True or False?

8794.

Question 5(a) Which of the following methods is not used in preventing iron from rusting?1. Applying a coating of zinc2. Applying a coating of lead3. Applying paint4. Applying grease(b) Planting more trees in and around the industrial regions ensures good quality air. True or False?

Answer»

Question 5

(a) Which of the following methods is not used in preventing iron from rusting?

1. Applying a coating of zinc

2. Applying a coating of lead

3. Applying paint

4. Applying grease

(b) Planting more trees in and around the industrial regions ensures good quality air. True or False?

Discussion

8795.	Question 15.The pH of the gastric juices released during digestion is :(a) less than 7(b) more than 7(c) equal to 7(d) equal to 0
Answer» Question 15. The pH of the gastric juices released during digestion is : (a) less than 7 (b) more than 7 (c) equal to 7 (d) equal to 0

Discussion

8796.	h2 gas is diatomic whereas inert gases are monoatomic _explain based on molecular orbital theor
Answer» h2 gas is diatomic whereas inert gases are monoatomic _explain based on molecular orbital theor

Discussion

8797.	If the molecules of SO2 effuses with a speed of 150cm in certain period of time, the distance travelled by the molecules of CH4 effusing in the same time is
Answer» If the molecules of $S O_{2}$ effuses with a speed of 150cm in certain period of time, the distance travelled by the molecules of $C H_{4} $ effusing in the same time is

Discussion

8798.	Consider the section of the Periodic Table given below: Note: In this table: B does not represent boron. C does not represent carbon. F does not represent fluorine. H does not represent hydrogen. K does not represent potassium. You must see the position of the element in the Periodic Table. Some elements are given in their own symbol and position in the Periodic Table while others are shown with a letter. With reference to the table: In the compound between F and J, what type of bond will be formed?
Answer» Consider the section of the Periodic Table given below: Note: In this table: B does not represent boron. C does not represent carbon. F does not represent fluorine. H does not represent hydrogen. K does not represent potassium. You must see the position of the element in the Periodic Table. Some elements are given in their own symbol and position in the Periodic Table while others are shown with a letter. With reference to the table: In the compound between F and J, what type of bond will be formed?

8798.

Consider the section of the Periodic Table given below: Note: In this table: B does not represent boron. C does not represent carbon. F does not represent fluorine. H does not represent hydrogen. K does not represent potassium. You must see the position of the element in the Periodic Table. Some elements are given in their own symbol and position in the Periodic Table while others are shown with a letter. With reference to the table: In the compound between F and J, what type of bond will be formed?

Answer»

Consider the section of the Periodic Table given below:

Note: In this table:

B does not represent boron. C does not represent carbon. F does not represent fluorine. H does not represent hydrogen. K does not represent potassium.

You must see the position of the element in the Periodic Table.

Some elements are given in their own symbol and position in the Periodic Table while others are shown with a letter. With reference to the table:

In the compound between F and J, what type of bond will be formed?

Discussion

8799.	31g of metal oxide releases 5.6 litrebof oxygen at NTP find the equivalent mass of metal
Answer» 31g of metal oxide releases 5.6 litrebof oxygen at NTP find the equivalent mass of metal

Discussion

8800.	Write equation for:The reaction of chlorine with excess of ammonia.
Answer» Write equation for: The reaction of chlorine with excess of ammonia.

Discussion

Explore topic-wise InterviewSolutions in .

Explain why, carbon cannot reduce oxides of sodium or magnesium.

Out of the following pairs of compounds, the unsaturated compounds are : (a) C2H6 and C4H6 (b) C6H12 and C5H12 (c) C4H6 and C6H12 (d) C2H6 and C4H10

Match the following fractions with their equivalent fractional forms.

Identify the reducing agent in the following chemical equation. 4NH3 + 5O2 → 4NO + 6H2O[1 mark]

Define the term neutralisation : (a) Give a reaction, mentioning clearly acid and base used in the reaction (b) If one mole of a strong acid reacts with one mole of a strong base, the heat produced is always the same. Why?

Match the following: Column A Column B 1. Acid salt 2. Mixed salt 3. Complex salt 4. Double salt 5. Normal salt (a) Sodium potassium carbonate (b) Alum (c) Sodium carbonate (d) Sodium zincate (e) Sodium hydrogen carbonate

Calculate the weight of CO having same number of oxygen atoms as are present in 88 grams of CO2.

What happens when methane and chlorine are exposed to direct sunlight.

pH of 0.01M HCOONH4 aqueous solution changes 1)on increasing dilution 2)on decreasing dilution 3)on adding NaCl in small amount 4)on increasing temperature explain with reason

54 The number of be localised Pi electrons in the given compound is 1)4 2)6 3)8 4)2

The excessive exposure of humans to ultraviolet rays results in : (i) damage to immune system (iii) skin cancer (ii) damage to lungs (iv) peptic ulcers (a) (i) and (ii) (b) (ii) and (iv) (c) (i) and (iv) (d) (iii) and (iv)

What is the chemical formula for plaster of Paris? How is it prepared? State the common and the chemical names of the compound formed when plaster of Paris is mixed with water.

Under the normal conditions, which of the given oxides when reacted with water turns red litmus blue?

The solution A and B are 0.1 and 0.2 molarin a substance. If 100 mL of A are mixed with 25 mL of B and there is no changein Volume on mixing then the final molarity of the solution is:

Choose the correct answer:The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white precipitate with barium chloride solution is:A. Iron (III) sulphateB. Iron (II) sulphateC. Iron (II) chlorideD. Iron (III) chloride

10. Four 1-1 litre flasks are separately filled with the gases H2, He, O2 & O3 at the same temperature and pressure. The ratio of total number of atoms of these gases present in different flask would be what?

What will happen if a piece of diamond is dropped in fire? Write chemical equation for the reaction. [2 MARKS]

Which of the following elements has maximum first ionization potential?

49. Is geometry of all alkanes tetrahedral or only methane's geometry is tetrahedral.

If the temperature of the Sun were to increase from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received per unit area per unit time on earth to what it was previously, will be-1)4, 2)16, 3)32, 4)64.

Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?​

A 50L cylinder is filled with argon gas to a pressure of 0130.0kPa at 30oC. How many moles of argon gas are in the cylinder?

A student took a sodium salt and dissolved it in water. When this aqueous sodium salt solution was tested with universal indicator paper, its pH was found to be 9.(a) What does pH 9 tell us about the sodium salt solution?(b) Name one sodium salt which can produce such a solution.

How will you convert(i) ethyne to ethane(ii) ethyne to acetaldehyde?

If one mole of monoatomic gas is mixed with one mole of diatomic gas then the value of y(gamma) for mixture is (y=adiabatic exponent)

The second step in the production of sulphuric acid(contact process) is given by the equation:\(2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)\) Ideally, which conditions would increase the yield of this reaction?

22. Benzene is aromatic or not

Give balanced equations when : (a) ethene is burnt in excess of oxygen. (b) ethene reacts with chlorine. (c) ethene combines with hydrogen chloride. (d) a mixture of ethene and hydrogen is passed over nickel at 200∘C.

Which of the following anion gives a colourless solution?

What is the trend in solubility of carbonates, bicarbonates, nitrates, hydroxides of alkali and alkaline earth metals

Identify the functional groups in the following: [3 MARKS] (i) CH3OH (ii) HCHO (iii) CH3COOH.

why potential difference remains same in conductor connected in parallel

The apparent weight of wood floating on water if it weighs 100g in air is

Give four differences between organic and inorganic compounds.

Why is the symbol S for sulphur, but Na for sodium and Si for silicon ?

is molar mass is always similar to atomic mass, molecular mass and formulla mass ?

What is the molecular formula of alcohol derived from butane.

A mixture of oxygen and ethyne is burnt for welding but not a mixture of ethyne and air. Explain with reason.

Which organisms belong to third and fourth trophic levels in the food chain comprising the following? Rats, Plants, Hawk, Snakes

The total number of neutrons in di positive zinc ions with mass number 70 is

Question 5(a) Which of the following methods is not used in preventing iron from rusting?1. Applying a coating of zinc2. Applying a coating of lead3. Applying paint4. Applying grease(b) Planting more trees in and around the industrial regions ensures good quality air. True or False?

Question 15.The pH of the gastric juices released during digestion is :(a) less than 7(b) more than 7(c) equal to 7(d) equal to 0

h2 gas is diatomic whereas inert gases are monoatomic _explain based on molecular orbital theor

If the molecules of SO2 effuses with a speed of 150cm in certain period of time, the distance travelled by the molecules of CH4­ effusing in the same time is

31g of metal oxide releases 5.6 litrebof oxygen at NTP find the equivalent mass of metal

Write equation for:The reaction of chlorine with excess of ammonia.

Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?

If the molecules of SO2 effuses with a speed of 150cm in certain period of time, the distance travelled by the molecules of CH4 effusing in the same time is