7248 + Interview Questions in Chemistry Page 111 InterviewSolution

5501.	The total atoms of oxygen in MnO2 is:2
Answer» The total atoms of oxygen in ${MnO}_{2}$ is: 2

Discussion

5502.	In which of the following reaction hydrogen peroxide is a reducing agent?
Answer» In which of the following reaction hydrogen peroxide is a reducing agent?

5502.

In which of the following reaction hydrogen peroxide is a reducing agent?

Answer»

In which of the following reaction hydrogen peroxide is a reducing agent?

Discussion

5503.	What is the work done in moving a box to a distance of 10 m by applying a force of 65 N?
Answer» What is the work done in moving a box to a distance of 10 m by applying a force of 65 N?

Discussion

5504.	An electric bulb of rating 50 W is used for 8 hr in one day. Find the number of units of energy used by the electric bulb in a day.
Answer» An electric bulb of rating $50 W$ is used for $8 hr$ in one day. Find the number of units of energy used by the electric bulb in a day.

Discussion

5505.	In which of these following processes, change in the states of matter involves absorption of energy? A. Boiling B. Sublimation C. Condensation D. Melting
Answer» In which of these following processes, change in the states of matter involves absorption of energy? A. Boiling B. Sublimation C. Condensation D. Melting

Discussion

5506.	Identify the substance that is more effective in cooling.
Answer» Identify the substance that is more effective in cooling.

Discussion

5507.	The most non-metallic element in group 17 is:
Answer» The most non-metallic element in group 17 is:

Discussion

5508.	Why is Helium so unreactive ?
Answer» Why is Helium so unreactive ?

Discussion

5509.	Thermo setting plastics are the ones which cannot be softened on heating; Give an example.
Answer» Thermo setting plastics are the ones which cannot be softened on heating; Give an example.

Discussion

5510.	The size of particles in suspension, true solution and colloidal solution varies in the order:
Answer» The size of particles in suspension, true solution and colloidal solution varies in the order:

Discussion

5511.	Which of the following statements is/are true?
Answer» Which of the following statements is/are true?

Discussion

5512.	What is the main purpose of petroleum refining ?
Answer» What is the main purpose of petroleum refining ?

Discussion

5513.	Which one of the following is applied on wounds as an antiseptic?
Answer» Which one of the following is applied on wounds as an antiseptic?

Discussion

5514.	Name any four toxic metals whose compounds are present in industrial wastes.
Answer» Name any four toxic metals whose compounds are present in industrial wastes.

Discussion

5515.

Match the entries of column I with the column II Metals Uses or properties (a) Osmium (i) Used to make cymbals (b) Lead (ii) Highest melting point (c) Bronze (iii) Used in storage batteries of vehicles (d) Tungsten (iv) Densest metal

Answer»

Match the entries of column I with the column II

Metals	Uses or properties
(a) Osmium	(i) Used to make cymbals
(b) Lead	(ii) Highest melting point
(c) Bronze	(iii) Used in storage batteries of vehicles
(d) Tungsten	(iv) Densest metal

Discussion

5516.	Give the trends of atomic radius, ionic radius, ionisation enthalpy, electron gain enthalpy, electronegativity, of s, p, d, f block elements.
Answer» Give the trends of atomic radius, ionic radius, ionisation enthalpy, electron gain enthalpy, electronegativity, of s, p, d, f block elements.

Discussion

5517.	Question 10 Which of the following is not a constituent of petroleum? (a) Paraffin wax (b) Lubricating oil (c) Petrol (d) Coke
Answer» Question 10 Which of the following is not a constituent of petroleum? (a) Paraffin wax (b) Lubricating oil (c) Petrol (d) Coke

Discussion

5518.	What we are not able to burn a piece of wet paper?
Answer» What we are not able to burn a piece of wet paper?

Discussion

5519.	Composition of nuclei of three atoms A, B and C are given below: A has 90 protons and 146 neutrons. B has 92 protons and 146 neutrons. C has 90 protons and 148 neutrons. Based on the above data, which of these atoms are isotopes and which are isobars?
Answer» Composition of nuclei of three atoms A, B and C are given below: A has 90 protons and 146 neutrons. B has 92 protons and 146 neutrons. C has 90 protons and 148 neutrons. Based on the above data, which of these atoms are isotopes and which are isobars?

Discussion

5520.	Water pollution can be potentially harmful to aquatic life. What are the ways by which water gets contaminated?
Answer» Water pollution can be potentially harmful to aquatic life. What are the ways by which water gets contaminated?

Discussion

5521.	Name any four pollutants which cause water pollution. State any three ways of controlling water pollution.
Answer» Name any four pollutants which cause water pollution. State any three ways of controlling water pollution.

Discussion

5522.	The human body contains water up to ___ .
Answer» The human body contains water up to ___ .

Discussion

5523.	Why is carbon monoxide called the silent killer?
Answer» Why is carbon monoxide called the silent killer?

Discussion

5524.	Question 7 (b) Explain why the following are made of thermosetting plastics. Electric plugs/switches/plug boards.
Answer» Question 7 (b) Explain why the following are made of thermosetting plastics. Electric plugs/switches/plug boards.

5524.

Question 7 (b) Explain why the following are made of thermosetting plastics. Electric plugs/switches/plug boards.

Answer»

Question 7 (b)
Explain why the following are made of thermosetting plastics.

Electric plugs/switches/plug boards.

Discussion

5525.	Which of the following define the work done by a force most accurately? 1. Work is the product of force and distance moved in the direction of force 2. Work is the product of force and distance moved perpendicular to the direction of force 3. Work is the product of distance and force applied.
Answer» Which of the following define the work done by a force most accurately? 1. Work is the product of force and distance moved in the direction of force 2. Work is the product of force and distance moved perpendicular to the direction of force 3. Work is the product of distance and force applied.

Discussion

5526.	Multiply (w + 1) and 4w:
Answer» Multiply (w + 1) and 4w:

Discussion

5527.	Metals in their pure state, have shining surfaces. Which of the below-mentioned properties is responsible for this?
Answer» Metals in their pure state, have shining surfaces. Which of the below-mentioned properties is responsible for this?

Discussion

5528.	Why can a piece of chalk be broken easily while a coal piece can not be broken easily?
Answer» Why can a piece of chalk be broken easily while a coal piece can not be broken easily?

Discussion

5529.	Does metal react with bases or not? Why?
Answer» Does metal react with bases or not? Why?

Discussion

5530.	Which of the following fuels has the highest calorific value ? (a) natural gas (b) liquefied petroleum gas (c) coal gas (d) hydrogen gas
Answer» Which of the following fuels has the highest calorific value ? (a) natural gas (b) liquefied petroleum gas (c) coal gas (d) hydrogen gas

5530.

Which of the following fuels has the highest calorific value ? (a) natural gas (b) liquefied petroleum gas (c) coal gas (d) hydrogen gas

Answer»

Which of the following fuels has the highest calorific value ?

(a) natural gas

(b) liquefied petroleum gas

(c) coal gas

(d) hydrogen gas

Discussion

5531.	What will happen when a small crystal of solute is added to supersaturated solution?
Answer» What will happen when a small crystal of solute is added to supersaturated solution?

Discussion

5532.	Which of the following are combination reactions? i) 4K + O2 → 2K2O ii) CuSO4 + 2NH4OH → (NH4)2SO4 + Cu(OH)2 iii) 2ZnS + 3O2 → 2ZnO + 2SO2 iv) Na2O + H2O → 2NaOH
Answer» Which of the following are combination reactions? i) 4K + O₂ → 2K₂O ii) CuSO₄+ 2NH₄OH → (NH₄)₂SO₄+ Cu(OH)₂ iii) 2ZnS + 3O₂ → 2ZnO + 2SO₂ iv) Na₂O + H₂O → 2NaOH

5532.

Which of the following are combination reactions? i) 4K + O2 → 2K2O ii) CuSO4 + 2NH4OH → (NH4)2SO4 + Cu(OH)2 iii) 2ZnS + 3O2 → 2ZnO + 2SO2 iv) Na2O + H2O → 2NaOH

Answer»

Which of the following are combination reactions?

i) 4K + O₂ → 2K₂O

ii) CuSO₄+ 2NH₄OH → (NH₄)₂SO₄+ Cu(OH)₂

iii) 2ZnS + 3O₂ → 2ZnO + 2SO₂

iv) Na₂O + H₂O → 2NaOH

Discussion

5533.	State the sources and effects of the following gases : (i) Carbon dioxide (ii) Methane (iii) Water vapour
Answer» State the sources and effects of the following gases : (i) Carbon dioxide (ii) Methane (iii) Water vapour

5533.

State the sources and effects of the following gases : (i) Carbon dioxide (ii) Methane (iii) Water vapour

Answer»

State the sources and effects of the following gases :

(i) Carbon dioxide

(ii) Methane

(iii) Water vapour

Discussion

5534.	Which of the following statements is true for saving fuel while driving a motor bike on the road?
Answer» Which of the following statements is true for saving fuel while driving a motor bike on the road?

Discussion

5535.	(a) Name one metal which reacts with dilute hydrochloric acid to produce hydrogen gas. (b)Name one metal which does not react with dilute hydrochloric acid.
Answer» (a) Name one metal which reacts with dilute hydrochloric acid to produce hydrogen gas. (b)Name one metal which does not react with dilute hydrochloric acid.

5535.

(a) Name one metal which reacts with dilute hydrochloric acid to produce hydrogen gas. (b)Name one metal which does not react with dilute hydrochloric acid.

Answer»

(a) Name one metal which reacts with dilute hydrochloric acid to produce hydrogen gas.

(b)Name one metal which does not react with dilute hydrochloric acid.

Discussion

5536.	Identify the synthetic fibre which resembles wool.
Answer» Identify the synthetic fibre which resembles wool.

Discussion

5537.	The lightest element in the periodic table is
Answer» The lightest element in the periodic table is

Discussion

5538.	The scattering of a beam of light by the colloidal particles is called ___ effect.
Answer» The scattering of a beam of light by the colloidal particles is called ___ effect.

Discussion

5539.	Why do we use chromium metal for electroplating over objects made of cheaper metals? [2 MARKS]
Answer» Why do we use chromium metal for electroplating over objects made of cheaper metals? [2 MARKS]

Discussion

5540.	What happens when red hot charcoal is passed through water.
Answer» What happens when red hot charcoal is passed through water.

Discussion

5541.	Is cotton is a solid???
Answer» Is cotton is a solid???

Discussion

5542.	Names and symbols of the constituent element and identify their valencies from the molecular formula. 1.KCl 2.HBr 3.MgBr2 4.K2O 5.NaH 6.CaCl2 7.CCl4 8.HI 9.H2S 10.NA2S 11.FeS 12.BaCl2
Answer» Names and symbols of the constituent element and identify their valencies from the molecular formula. 1.KCl 2.HBr 3.MgBr2 4.K2O 5.NaH 6.CaCl2 7.CCl4 8.HI 9.H2S 10.NA2S 11.FeS 12.BaCl2

Discussion

5543.	As we can devide hydrogen and oxygen from distilled water through electrolysis can we form up water again using hydrogen and oxygen in the process of electrolysis?
Answer» As we can devide hydrogen and oxygen from distilled water through electrolysis can we form up water again using hydrogen and oxygen in the process of electrolysis?

Discussion

5544.	Characteristics of anthracite
Answer» Characteristics of anthracite

Discussion

5545.	Which of the following is used as a drying agent:-
Answer» Which of the following is used as a drying agent:-

Discussion

5546.	Why should people look for alternative sources of fossil fuels?
Answer» Why should people look for alternative sources of fossil fuels?

Discussion

5547.	Can atom exist independently
Answer» Can atom exist independently

Discussion

5548.	Water which is purified and fit for drinking is known as __ water.
Answer» Water which is purified and fit for drinking is known as __ water.

Discussion

5549.	Give examples of substances which do not burn. Why do they not burn? [3 MARKS]
Answer» Give examples of substances which do not burn. Why do they not burn? [3 MARKS]

Discussion

5550.	The correct order for fuels mentioned below in terms of increasing calorific value will be - CNG, Petrol, Cow Dung Cake and Wood.
Answer» The correct order for fuels mentioned below in terms of increasing calorific value will be - CNG, Petrol, Cow Dung Cake and Wood.

Discussion

Explore topic-wise InterviewSolutions in .

The total atoms of oxygen in MnO2 is:2

In which of the following reaction hydrogen peroxide is a reducing agent?

What is the work done in moving a box to a distance of 10 m by applying a force of 65 N?

An electric bulb of rating 50 W is used for 8 hr in one day. Find the number of units of energy used by the electric bulb in a day.

In which of these following processes, change in the states of matter involves absorption of energy? A. Boiling B. Sublimation C. Condensation D. Melting

Identify the substance that is more effective in cooling.

The most non-metallic element in group 17 is:

Why is Helium so unreactive ?

Thermo setting plastics are the ones which cannot be softened on heating; Give an example.

The size of particles in suspension, true solution and colloidal solution varies in the order:

Which of the following statements is/are true?

What is the main purpose of petroleum refining ?

Which one of the following is applied on wounds as an antiseptic?

Name any four toxic metals whose compounds are present in industrial wastes.

Match the entries of column I with the column II Metals Uses or properties (a) Osmium (i) Used to make cymbals (b) Lead (ii) Highest melting point (c) Bronze (iii) Used in storage batteries of vehicles (d) Tungsten (iv) Densest metal

Give the trends of atomic radius, ionic radius, ionisation enthalpy, electron gain enthalpy, electronegativity, of s, p, d, f block elements.

Question 10 Which of the following is not a constituent of petroleum? (a) Paraffin wax (b) Lubricating oil (c) Petrol (d) Coke

What we are not able to burn a piece of wet paper?

Composition of nuclei of three atoms A, B and C are given below: A has 90 protons and 146 neutrons. B has 92 protons and 146 neutrons. C has 90 protons and 148 neutrons. Based on the above data, which of these atoms are isotopes and which are isobars?

Water pollution can be potentially harmful to aquatic life. What are the ways by which water gets contaminated?

Name any four pollutants which cause water pollution. State any three ways of controlling water pollution.

The human body contains water up to ___ .

Why is carbon monoxide called the silent killer?

Question 7 (b) Explain why the following are made of thermosetting plastics. Electric plugs/switches/plug boards.

Which of the following define the work done by a force most accurately? ​ 1. Work is the product of force and distance moved in the direction of force 2. Work is the product of force and distance moved perpendicular to the direction of force 3. Work is the product of distance and force applied.

Multiply (w + 1) and 4w:

Metals in their pure state, have shining surfaces. Which of the below-mentioned properties is responsible for this?

Why can a piece of chalk be broken easily while a coal piece can not be broken easily?

Does metal react with bases or not? Why?

Which of the following fuels has the highest calorific value ? (a) natural gas (b) liquefied petroleum gas (c) coal gas (d) hydrogen gas

What will happen when a small crystal of solute is added to supersaturated solution?

Which of the following are combination reactions? i) 4K + O2 → 2K2O ii) CuSO4 + 2NH4OH → (NH4)2SO4 + Cu(OH)2 iii) 2ZnS + 3O2 → 2ZnO + 2SO2 iv) Na2O + H2O → 2NaOH

State the sources and effects of the following gases : (i) Carbon dioxide (ii) Methane (iii) Water vapour

Which of the following statements is true for saving fuel while driving a motor bike on the road?

(a) Name one metal which reacts with dilute hydrochloric acid to produce hydrogen gas. (b)Name one metal which does not react with dilute hydrochloric acid.

Identify the synthetic fibre which resembles wool.

The lightest element in the periodic table is

The scattering of a beam of light by the colloidal particles is called ___ effect.

Why do we use chromium metal for electroplating over objects made of cheaper metals? [2 MARKS]

What happens when red hot charcoal is passed through water.

Is cotton is a solid???

Names and symbols of the constituent element and identify their valencies from the molecular formula. 1.KCl 2.HBr 3.MgBr2 4.K2O 5.NaH 6.CaCl2 7.CCl4 8.HI 9.H2S 10.NA2S 11.FeS 12.BaCl2

As we can devide hydrogen and oxygen from distilled water through electrolysis can we form up water again using hydrogen and oxygen in the process of electrolysis?

Characteristics of anthracite

Which of the following is used as a drying agent:-

Why should people look for alternative sources of fossil fuels?

Can atom exist independently

Water which is purified and fit for drinking is known as __ water.

Give examples of substances which do not burn. Why do they not burn? [3 MARKS]

The correct order for fuels mentioned below in terms of increasing calorific value will be - CNG, Petrol, Cow Dung Cake and Wood.

Which of the following define the work done by a force most accurately? 1. Work is the product of force and distance moved in the direction of force 2. Work is the product of force and distance moved perpendicular to the direction of force 3. Work is the product of distance and force applied.