7248 + Interview Questions in Chemistry Page 44 InterviewSolution

2151.	The enthalpy of combustion of H2, cyclohexene and cyclohexane are -241,-3800,-3920 kJ/mol respectively.Heat of hydrogenation of cyclohexene is?
Answer» The enthalpy of combustion of H2, cyclohexene and cyclohexane are -241,-3800,-3920 kJ/mol respectively.Heat of hydrogenation of cyclohexene is?

Discussion

2152.	what is equivalent weight of H2O2 ? Is it 34 or 17 ?
Answer» what is equivalent weight of H2O2 ? Is it 34 or 17 ?

Discussion

2153.	Based on atomicity, which type of molecule is water?
Answer» Based on atomicity, which type of molecule is water?

Discussion

2154.	A mixture of iron nails, salt, oil, and water is provided to you. Give stepwise methods to separate each component from this mixture?
Answer» A mixture of iron nails, salt, oil, and water is provided to you. Give stepwise methods to separate each component from this mixture?

Discussion

2155.	What is meant by saying that metals are :(i) malleable (ii) ductile (iii) lustrous , and (iv) sonorous ?
Answer» What is meant by saying that metals are :(i) malleable (ii) ductile (iii) lustrous , and (iv) sonorous ?

Discussion

2156.	If standard heat of formation of CO2 is – 400 KJ/mol. The amount of C(graphite) required, if 10 KJ heat is released during the combustion, is _____ g.
Answer» If standard heat of formation of $C O_{2}$ is – 400 KJ/mol. The amount of C(graphite) required, if 10 KJ heat is released during the combustion, is _____ g.

Discussion

2157.	State the difference between conduction and convection
Answer» State the difference between conduction and convection

Discussion

2158.	what is the ma in difference between solute and solvent ?
Answer» what is the ma in difference between solute and solvent ?

Discussion

2159.	Why is copper or silver used in coins?
Answer» Why is copper or silver used in coins?

Discussion

2160.	If a glass is blue in colour, which additional compound does it contain?
Answer» If a glass is blue in colour, which additional compound does it contain?

Discussion

2161.	Give reasons: 1. ions are more stable than atoms 2. nobel gases are chemically inactiv
Answer» Give reasons: 1. ions are more stable than atoms 2. nobel gases are chemically inactiv

Discussion

2162.	Question 10Describe the threat to the beauty of the Taj Mahal.
Answer» Question 10 Describe the threat to the beauty of the Taj Mahal.

Discussion

2163.	Give examples which indicate that nylon fibres are very strong.
Answer» Give examples which indicate that nylon fibres are very strong.

Discussion

2164.	Question 37Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in the reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.
Answer» Question 37 Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in the reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.

Discussion

2165.	Which of the following is not an example of surface water?
Answer» Which of the following is not an example of surface water?

Discussion

2166.	In fractional distillation, oil is heated to about:
Answer» In fractional distillation, oil is heated to about:

Discussion

2167.	Define covalency.
Answer» Define covalency.

Discussion

2168.	What is the molar volume of an ideal gast at STP?
Answer» What is the molar volume of an ideal gast at STP?

Discussion

2169.	Out of the following distillates of coal, which one readily undergo combustion?
Answer» Out of the following distillates of coal, which one readily undergo combustion?

Discussion

2170.	Classify the following into elements and compounds: Water, Hydrogen, Salt, Gold, Carbon dioxide, Iron
Answer» Classify the following into elements and compounds: Water, Hydrogen, Salt, Gold, Carbon dioxide, Iron

2170.

Classify the following into elements and compounds: Water, Hydrogen, Salt, Gold, Carbon dioxide, Iron

Answer»

Classify the following into elements and compounds:

Water, Hydrogen, Salt, Gold, Carbon dioxide, Iron

Discussion

2171.	The reaction in which energy is absorbed is called as an _____________.
Answer» The reaction in which energy is absorbed is called as an _____________.

Discussion

2172.	a solution of a substance X is used for whitewashing.1.name the substance X and write its formula.2.write the reaction of the substance X with water
Answer» a solution of a substance X is used for whitewashing. 1.name the substance X and write its formula. 2.write the reaction of the substance X with water

Discussion

2173.	Number of valence electron in hydrogen atom is ___ .
Answer» Number of valence electron in hydrogen atom is ___ .

2173.

Number of valence electron in hydrogen atom is ___ .

Answer»

Number of valence electron in hydrogen atom is ___ .

Discussion

2174.	A sample of drinking water was found to be severely contaminated with chloroform,CHCl3 , supposed to be carcinogenic in nature. The level of contamination was 15ppm(by mass). ✓express this in % by mass. ✓determine the molality of chloroform in the water sample.
Answer» A sample of drinking water was found to be severely contaminated with chloroform,CHCl3 , supposed to be carcinogenic in nature. The level of contamination was 15ppm(by mass). ✓express this in % by mass. ✓determine the molality of chloroform in the water sample.

Discussion

2175.	What is kinetic energy and potential energy??
Answer» What is kinetic energy and potential energy??

Discussion

2176.	The volume of 1L water upon vapourisation at STP is nearly?
Answer» The volume of 1L water upon vapourisation at STP is nearly?

Discussion

2177.	Question 26Match the items given in Column I with the items of Column II.Column IColumn II(a)Used for road surfacing (i)Black gold(b)Natural gas(ii)Vaseline and candles(c)Petroleum (iii)Bitumen(d)Paraffin wax (iv)CNG
Answer» Question 26 Match the items given in Column I with the items of Column II. $\begin{matrix} Column I & Column II (a)Used for road surfacing & (i)Black gold (b)Natural gas & (ii)Vaseline and candles (c)Petroleum & (iii)Bitumen (d)Paraffin wax & (iv)CNG \end{matrix}$

2177.

Question 26Match the items given in Column I with the items of Column II.Column IColumn II(a)Used for road surfacing (i)Black gold(b)Natural gas(ii)Vaseline and candles(c)Petroleum (iii)Bitumen(d)Paraffin wax (iv)CNG

Answer»

Question 26

Match the items given in Column I with the items of Column II.

$\begin{matrix} Column I & Column II (a)Used for road surfacing & (i)Black gold (b)Natural gas & (ii)Vaseline and candles (c)Petroleum & (iii)Bitumen (d)Paraffin wax & (iv)CNG \end{matrix}$

Discussion

2178.	We heat ink to obtain the coloured component (dye) in a watch glass (similar to a glass cup). The process involved here is ______ and the component removed from ink is ________.
Answer» We heat ink to obtain the coloured component (dye) in a watch glass (similar to a glass cup). The process involved here is ______ and the component removed from ink is ________.

Discussion

2179.	Write the importance of synthetic polymers in our life.
Answer» Write the importance of synthetic polymers in our life.

Discussion

2180.	Which of the following arrangements represent possible presentations of Bohr’s model of an atom correctly?
Answer» Which of the following arrangements represent possible presentations of Bohr’s model of an atom correctly?

Discussion

2181.	Which of the following is not an advantage of Natural gas?
Answer» Which of the following is not an advantage of Natural gas?

Discussion

2182.	What is diffrent between CNG AND LPG
Answer» What is diffrent between CNG AND LPG

Discussion

2183.	Question 6What happens when calcium is treated with water?(i) It does not react with water.(ii) It reacts violently with water.(iii) It reacts less violently with water.(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.a) (i) and (iv) (b) (ii) and (iii)(c) (i) and (ii) (d) (iii) and (iv)
Answer» Question 6 What happens when calcium is treated with water? (i) It does not react with water. (ii) It reacts violently with water. (iii) It reacts less violently with water. (iv) Bubbles of hydrogen gas formed stick to the surface of calcium. a) (i) and (iv) (b) (ii) and (iii) (c) (i) and (ii) (d) (iii) and (iv)

2183.

Question 6What happens when calcium is treated with water?(i) It does not react with water.(ii) It reacts violently with water.(iii) It reacts less violently with water.(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.a) (i) and (iv) (b) (ii) and (iii)(c) (i) and (ii) (d) (iii) and (iv)

Answer»

Question 6

What happens when calcium is treated with water?

(i) It does not react with water.

(ii) It reacts violently with water.

(iii) It reacts less violently with water.

(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.

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

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

Discussion

2184.	how to find oxidative state?
Answer» how to find oxidative state?

Discussion

2185.	What happens when SO2 gas is passed through potassium dichromate solution?
Answer» What happens when SO₂ gas is passed through potassium dichromate solution?

2185.

What happens when SO2 gas is passed through potassium dichromate solution?

Answer»

What happens when SO₂ gas is passed through potassium dichromate solution?

Discussion

2186.	Write the chemical equation for the chemical reaction shown in the illustration. In the illustration: The black sphere represents a carbon atom. The white sphere represents a hydrogen atom. The grey sphere represents an oxygen atom.
Answer» Write the chemical equation for the chemical reaction shown in the illustration. In the illustration: The black sphere represents a carbon atom. The white sphere represents a hydrogen atom. The grey sphere represents an oxygen atom.

Discussion

2187.

From the following data, the decomposition of H2O2 in aqueous solution follows first order kinetics. Then calculate its rate constant (k) value.Time (in minutes)01020Volume (V) in mL22137.5where V is the volume of potassium permanganate required to react with undecomposed hydrogen peroxide solution. Take log2213=0.23log227.5=0.46

Answer»

From the following data, the decomposition of $H_{2} O_{2}$ in aqueous solution follows first order kinetics. Then calculate its rate constant (k) value.

Time (in minutes)	0	10	20
Volume (V) in $m L$	22	13	7.5

where V is the volume of potassium permanganate required to react with undecomposed hydrogen peroxide solution.

Take

l o g \frac{22}{13} = 0.23 l o g \frac{22}{7.5} = 0.46

Discussion

2188.	50 The mass of carbon present in 0.05 mole of K[Fe(CN)] is :- (1) 1.8g (2) 3.6g (3) 36g (4) 0.36g
Answer» 50 The mass of carbon present in 0.05 mole of K[Fe(CN)] is :- (1) 1.8g (2) 3.6g (3) 36g (4) 0.36g

Discussion

2189.	What is an indicator?
Answer» What is an indicator?

Discussion

2190.	24. The pOH at which water is maximum dissociated at 25 degree celsius 1. 14 2. 7 3. 0 4. none
Answer» 24. The pOH at which water is maximum dissociated at 25 degree celsius 1. 14 2. 7 3. 0 4. none

Discussion

2191.	Name the most common fuel used in light motor vehicles.
Answer» Name the most common fuel used in light motor vehicles.

Discussion

2192.	What is a detergent?
Answer» What is a detergent?

Discussion

2193.	Which word in stanza 2 is opposite in meaning to ‘the frost’?
Answer» Which word in stanza 2 is opposite in meaning to ‘the frost’?

Discussion

2194.	What is the difference between a mineral and a ore?
Answer» What is the difference between a mineral and a ore?

Discussion

2195.	8.The electric current due to electron in nth Bohr orbit is equal to?
Answer» 8.The electric current due to electron in nth Bohr orbit is equal to?

Discussion

2196.	Question 9 (a)Pratyush took sulphur powder with a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:What will be the action of gas on:(i) dry litmus paper?(ii) moist litmus paper?
Answer» Question 9 (a) Pratyush took sulphur powder with a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below: What will be the action of gas on: (i) dry litmus paper? (ii) moist litmus paper?

2196.

Question 9 (a)Pratyush took sulphur powder with a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:What will be the action of gas on:(i) dry litmus paper?(ii) moist litmus paper?

Answer»

Question 9 (a)

Pratyush took sulphur powder with a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:

What will be the action of gas on:

(i) dry litmus paper?

(ii) moist litmus paper?

Discussion

2197.	Gas analysis of sample shows that it has 20% H2, 40% CH4, 10% CO, 20% C2H6 and 10% noncombustibleinert gases (Volume%). 2m³ volume of above sample is combusted (burnt) completely with oxygen. If X isthe volume of air required (in m³). Calculate the value of (10X/33).(Air consist 20% oxygen by volume)
Answer» Gas analysis of sample shows that it has 20% H2, 40% CH4, 10% CO, 20% C2H6 and 10% noncombustibleinert gases (Volume%). 2m³ volume of above sample is combusted (burnt) completely with oxygen. If X is the volume of air required (in m³). Calculate the value of (10X/33).(Air consist 20% oxygen by volume)

Discussion

2198.	1. Who discovered plasma and Bose Einstein condensate
Answer» 1. Who discovered plasma and Bose Einstein condensate

Discussion

2199.	Which material is used to make sonorous articles?
Answer» Which material is used to make sonorous articles?

Discussion

2200.	Explain the term 'green house effect'. What are its benefits? How is it harmful?
Answer» Explain the term 'green house effect'. What are its benefits? How is it harmful?

Discussion

Explore topic-wise InterviewSolutions in .

The enthalpy of combustion of H2, cyclohexene and cyclohexane are -241,-3800,-3920 kJ/mol respectively.Heat of hydrogenation of cyclohexene is?

what is equivalent weight of H2O2 ? Is it 34 or 17 ?

Based on atomicity, which type of molecule is water?

A mixture of iron nails, salt, oil, and water is provided to you. Give stepwise methods to separate each component from this mixture?​

What is meant by saying that metals are :(i) malleable (ii) ductile (iii) lustrous , and (iv) sonorous ?

If standard heat of formation of CO2 is – 400 KJ/mol. The amount of C(graphite) required, if 10 KJ heat is released during the combustion, is _____ g.

State the difference between conduction and convection

what is the ma in difference between solute and solvent ?

Why is copper or silver used in coins?

If a glass is blue in colour, which additional compound does it contain?

Give reasons: 1. ions are more stable than atoms 2. nobel gases are chemically inactiv

Question 10Describe the threat to the beauty of the Taj Mahal.

Give examples which indicate that nylon fibres are very strong.

Which of the following is not an example of surface water?

In fractional distillation, oil is heated to about:

Define covalency.

What is the molar volume of an ideal gast at STP?

Out of the following distillates of coal, which one readily undergo combustion?

Classify the following into elements and compounds: Water, Hydrogen, Salt, Gold, Carbon dioxide, Iron

The reaction in which energy is absorbed is called as an _____________.

a solution of a substance X is used for whitewashing.1.name the substance X and write its formula.2.write the reaction of the substance X with water

Number of valence electron in hydrogen atom is ___ .

A sample of drinking water was found to be severely contaminated with chloroform,CHCl3 , supposed to be carcinogenic in nature. The level of contamination was 15ppm(by mass). ✓express this in % by mass. ✓determine the molality of chloroform in the water sample.

What is kinetic energy and potential energy??

The volume of 1L water upon vapourisation at STP is nearly?

Question 26Match the items given in Column I with the items of Column II.Column IColumn II(a)Used for road surfacing (i)Black gold(b)Natural gas(ii)Vaseline and candles(c)Petroleum (iii)Bitumen(d)Paraffin wax (iv)CNG

We heat ink to obtain the coloured component (dye) in a watch glass (similar to a glass cup). The process involved here is ______ and the component removed from ink is ________.

Write the importance of synthetic polymers in our life.​

Which of the following arrangements represent possible presentations of Bohr’s model of an atom correctly?

Which of the following is not an advantage of Natural gas?

What is diffrent between CNG AND LPG

how to find oxidative state?

What happens when SO2 gas is passed through potassium dichromate solution?

Write the chemical equation for the chemical reaction shown in the illustration. In the illustration: The black sphere represents a carbon atom.​​ The white sphere represents a hydrogen atom. The grey sphere represents an oxygen atom.

50 The mass of carbon present in 0.05 mole of K[Fe(CN)] is :- (1) 1.8g (2) 3.6g (3) 36g (4) 0.36g

What is an indicator?

24. The pOH at which water is maximum dissociated at 25 degree celsius 1. 14 2. 7 3. 0 4. none

Name the most common fuel used in light motor vehicles.

What is a detergent?

Which word in stanza 2 is opposite in meaning to ‘the frost’?

What is the difference between a mineral and a ore?

8.The electric current due to electron in nth Bohr orbit is equal to?

Question 9 (a)Pratyush took sulphur powder with a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:What will be the action of gas on:(i) dry litmus paper?(ii) moist litmus paper?

1. Who discovered plasma and Bose Einstein condensate

Which material is used to make sonorous articles?

Explain the term 'green house effect'. What are its benefits? How is it harmful?

A mixture of iron nails, salt, oil, and water is provided to you. Give stepwise methods to separate each component from this mixture?

We heat ink to obtain the coloured component (dye) in a watch glass (similar to a glass cup). The process involved here is and the component removed from ink is __.

Write the importance of synthetic polymers in our life.

Write the chemical equation for the chemical reaction shown in the illustration. In the illustration: The black sphere represents a carbon atom. The white sphere represents a hydrogen atom. The grey sphere represents an oxygen atom.