5083 + Interview Questions in Chemistry Page 40 InterviewSolution

1951.	Which of the following is the most vital component present in all living forms?
Answer» Which of the following is the most vital component present in all living forms?

Discussion

1952.	What is meant by weak acid and weak base are strong electrolytes?
Answer» What is meant by weak acid and weak base are strong electrolytes?

Discussion

1953.	Why is the valency of oxygen 2?
Answer» Why is the valency of oxygen 2?

Discussion

1954.	No. of neutrons present in 23892Ur are:
Answer» No. of neutrons present in $_{92}^{238} Ur$ are:

Discussion

1955.	39.A compressed cylinder of gas contain 1500 g of N2 gas at a pressure of 197.4 atm and a temperature of 17.1^° C. What volume of the gas has been released into the atmosphere if the final pressure in the cylinder is 1.77 atm? Assume ideal behaviour and that the gas temperature is unchanged.
Answer» 39.A compressed cylinder of gas contain 1500 g of N2 gas at a pressure of 197.4 atm and a temperature of 17.1^° C. What volume of the gas has been released into the atmosphere if the final pressure in the cylinder is 1.77 atm? Assume ideal behaviour and that the gas temperature is unchanged.

Discussion

1956.	Which of the following activities can help in the conservation of forests?
Answer» Which of the following activities can help in the conservation of forests?

1956.

Which of the following activities can help in the conservation of forests?

Answer»

Which of the following activities can help in the conservation of forests?

Discussion

1957.	Why does rayon absorb more water than other synthetic fibres
Answer» Why does rayon absorb more water than other synthetic fibres

Discussion

1958.	Match the column 1 with 2 and select the correct option from the codes given below: Colomn 1. Colomn 2 (Material). (Smell on burning) (a) silk. (I) burning plastic (b) wool. (ii) charred meat (c)nylon. (iii)burning hair
Answer» Match the column 1 with 2 and select the correct option from the codes given below: Colomn 1. Colomn 2 (Material). (Smell on burning) (a) silk. (I) burning plastic (b) wool. (ii) charred meat (c)nylon. (iii)burning hair

Discussion

1959.	Question 3Which postulate of Dalton’s atomic theory is the result of the law of conservation ofmass?
Answer» Question 3 Which postulate of Dalton’s atomic theory is the result of the law of conservation ofmass?

Discussion

1960.	Describe various steps of cleaning wastewater in a wastewater treatment plant.
Answer» Describe various steps of cleaning wastewater in a wastewater treatment plant.

Discussion

1961.	Property of the metals due to which they can be beaten into sheets is known as
Answer» Property of the metals due to which they can be beaten into sheets is known as

Discussion

1962.	64. In a first order reaction that is A gives B .if K is rate constant and initial concentration of reactant A is 0.5 M then half life is .
Answer» 64. In a first order reaction that is A gives B .if K is rate constant and initial concentration of reactant A is 0.5 M then half life is .

Discussion

1963.	The formula of a metal oxide is M2O3. If the metal forms its chloride, what will the formula of that compound be?
Answer» The formula of a metal oxide is $M_{2} O_{3}$ . If the metal forms its chloride, what will the formula of that compound be?

Discussion

1964.	Which scientist among the following said that all matter is composed of small particles called atoms?
Answer» Which scientist among the following said that all matter is composed of small particles called atoms?

Discussion

1965.	Curd is not stored in brass vessels .Why?
Answer» Curd is not stored in brass vessels .Why?

Discussion

1966.	Define atomicity. What will be the atomicity of ozone and ammonia?
Answer» Define atomicity. What will be the atomicity of ozone and ammonia?

Discussion

1967.	What is bromocresol green?
Answer» What is bromocresol green?

Discussion

1968.	Which burns faster acrylic or cotton ?Which fibre among all burns faster
Answer» Which burns faster acrylic or cotton ? Which fibre among all burns faster

Discussion

1969.	What is the valency of carbon in CH4 ?__
Answer» What is the valency of carbon in ${C H}_{4}$ ? __

Discussion

1970.	predict wether F2 reacts with Na E†extbullet CELLF2/F-=2.87 andE†extbullet Cell Na+/Na=-2.71
Answer» predict wether F2 reacts with Na E†extbullet CELLF2/F-=2.87 andE†extbullet Cell Na+/Na=-2.71

Discussion

1971.	Question 4 Which of the following is/are true when milk changes into curd? (i) Its state is changed from liquids to semi-solid. (ii) It changes colour. (iii) It changes taste. (iv) The change cannot be reversed. Choose the correct option from below : (a) (i) and (ii) (b) (ii) and (iii) (c) (i), (iii) and (iv) (d) (i) to (iv)
Answer» Question 4 Which of the following is/are true when milk changes into curd? (i) Its state is changed from liquids to semi-solid. (ii) It changes colour. (iii) It changes taste. (iv) The change cannot be reversed. Choose the correct option from below : (a) (i) and (ii) (b) (ii) and (iii) (c) (i), (iii) and (iv) (d) (i) to (iv)

1971.

Question 4 Which of the following is/are true when milk changes into curd? (i) Its state is changed from liquids to semi-solid. (ii) It changes colour. (iii) It changes taste. (iv) The change cannot be reversed. Choose the correct option from below : (a) (i) and (ii) (b) (ii) and (iii) (c) (i), (iii) and (iv) (d) (i) to (iv)

Answer»

Question 4

Which of the following is/are true when milk changes into curd?

(i) Its state is changed from liquids to semi-solid.
(ii) It changes colour.
(iii) It changes taste.
(iv) The change cannot be reversed.

Choose the correct option from below :
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i), (iii) and (iv)
(d) (i) to (iv)

Discussion

1972.	Why do woollen fibre and silk fibre smell the same when burnt?
Answer» Why do woollen fibre and silk fibre smell the same when burnt?

Discussion

1973.	mvr=n*h/2pi ; in these what is 'h'
Answer» mvr=n*h/2pi ; in these what is 'h'

Discussion

1974.

Given below are some compounds and the number of atoms of their constituent elements in each of their molecules. Write their molecular formulas. Compound Number of atoms of constituent elements Formula (a) Potassium hydroxide K:1, O:1, H:1 KOH (b) Hydrogen peroxide H:2, O:2 (c) Iron chloride Fe:1, Cl:2 (d) Ammonium chloride N:1, H:4, Cl:1 (e) Copper sulphate Cu:1, S:1, O:4 (f) Magnesium oxide Mg:1, O:1

Answer»

Given below are some compounds and the number of atoms of their constituent elements in each of their molecules. Write their molecular formulas.

	Compound	Number of atoms of constituent elements	Formula
(a)	Potassium hydroxide	K:1, O:1, H:1	KOH
(b)	Hydrogen peroxide	H:2, O:2
(c)	Iron chloride	Fe:1, Cl:2
(d)	Ammonium chloride	N:1, H:4, Cl:1
(e)	Copper sulphate	Cu:1, S:1, O:4
(f)	Magnesium oxide	Mg:1, O:1

Discussion

1975.	Rate of the chemical reaction: nA→Products, is doubled when the concentration of A is increased four times. If the half time of the reaction at any temperature is 16 min, time required for 75% of the reaction to complete is:
Answer» Rate of the chemical reaction: $n A \to Products$ , is doubled when the concentration of $A$ is increased four times. If the half time of the reaction at any temperature is $16 m i n$ , time required for $75 %$ of the reaction to complete is:

Discussion

1976.	How many metals are known today
Answer» How many metals are known today

Discussion

1977.	True or falseA. Water does not get polluted by washing the cloths in running water of river.B. More the use of electric appliances, more will be the pollution.
Answer» True or false A. Water does not get polluted by washing the cloths in running water of river. B. More the use of electric appliances, more will be the pollution.

Discussion

1978.	What will be the value given by universal indicator for neutral solution?7
Answer» What will be the value given by universal indicator for neutral solution? 7

Discussion

1979.	Molar conductivity for a compound AB is 145.0 S cm2 mol−1 and for CB is 110.1 S cm2 mol−1. Limiting molar conductivity for A+ is 73.5 S cm2 mol−1. What is the molar conductivity for C+?
Answer» Molar conductivity for a compound AB is $145.0 S c m^{2} m o l^{- 1}$ and for CB is $110.1 S c m^{2} m o l^{- 1}$ . Limiting molar conductivity for $A^{+}$ is $73.5 S c m^{2} m o l^{- 1}$ . What is the molar conductivity for $C^{+}$ ?

Discussion

1980.	Rivet is heated before fixing in the hole to join two metal plates. Why ?
Answer» Rivet is heated before fixing in the hole to join two metal plates. Why ?

Discussion

1981.	For a cell Mg(s)\|Mg2+(aq)\|\|Ag+(aq)\|Ag, find the maximum work (in kJ) that can be obtained by operating the cell.Eo(Mg2+/Mg)=−2.37 V, Eo(Ag+/Ag)=0.8 V
Answer» For a cell $M g (s) \| M g^{2 +} (a q) \| \| A g^{+} (a q) \| A g$ , find the maximum work (in kJ) that can be obtained by operating the cell. $E^{o} (M g^{2 +} / M g) = - 2.37 V, E^{o} (A g^{+} / A g) = 0.8 V$

Discussion

1982.	An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet-like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure.(a) Name the element E.(b) What is allotrope A?(c) What is allotrope B?(d) What is allotrope C?(e) Which allotrope is used in making jewellery?(f) Which allotrope is used in making the electrode of a dry cell?
Answer» An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet-like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure. (a) Name the element E. (b) What is allotrope A? (c) What is allotrope B? (d) What is allotrope C? (e) Which allotrope is used in making jewellery? (f) Which allotrope is used in making the electrode of a dry cell?

Discussion

1983.	Find the value of y. 3Fe+yH2O→Fe3O4+4H2
Answer» Find the value of y. $3 F e + y H_{2} O \to F e_{3} O_{4} + 4 H_{2}$

1983.

Find the value of y. 3Fe+yH2O→Fe3O4+4H2

Answer»

Find the value of y.

$3 F e + y H_{2} O \to F e_{3} O_{4} + 4 H_{2}$

Discussion

1984.	148.Why carbon is not used as semiconductor
Answer» 148.Why carbon is not used as semiconductor

Discussion

1985.	Explain why:(a) An antacid tablet is taken when you suffer from acidity.(b) Calamine solution is applied on the skin whenan ant bites.(c) Factory waste is neutralised before disposingit into the water bodies.
Answer» Explain why: (a) An antacid tablet is taken when you suffer from acidity. (b) Calamine solution is applied on the skin when an ant bites. (c) Factory waste is neutralised before disposing it into the water bodies.

1985.

Explain why:(a) An antacid tablet is taken when you suffer from acidity.(b) Calamine solution is applied on the skin whenan ant bites.(c) Factory waste is neutralised before disposingit into the water bodies.

Answer»

Explain why:

(a) An antacid tablet is taken when you suffer from acidity.

(b) Calamine solution is applied on the skin when
an ant bites.

(c) Factory waste is neutralised before disposing
it into the water bodies.

Discussion

1986.	2.A and B are two elements which have same atomicweight and are having atomic number 27 and 30respectively. If the atomic weight of A is 57 thennumber of neutron in B is(1) 27 (2) 33 (3) 30 (4) 40:-
Answer» 2.A and B are two elements which have same atomicweight and are having atomic number 27 and 30respectively. If the atomic weight of A is 57 thennumber of neutron in B is(1) 27 (2) 33 (3) 30 (4) 40:-

Discussion

1987.	Statement A: Heating can bring about change. Statement B: Cooling can also bring about change. Select the correct option about the given statements.
Answer» Statement A: Heating can bring about change. Statement B: Cooling can also bring about change. Select the correct option about the given statements.

Discussion

1988.	The density of ice is ___________ that of water.
Answer» The density of ice is ___________ that of water.

Discussion

1989.	An atom X has 2 electrons greater than its nearest noble gas. What would be the formula of its:a) chlorideb) oxide
Answer» An atom X has 2 electrons greater than its nearest noble gas. What would be the formula of its: a) chloride b) oxide

Discussion

1990.	When two half cells of electrode potential E1 and E2 combine to form a cell of electrode potential E3 then choose the correct relation :Here n1,n2 & n3 are no. of electrons exhanged in first, second and combined half cells
Answer» When two half cells of electrode potential $E_{1}$ and $E_{2}$ combine to form a cell of electrode potential $E_{3}$ then choose the correct relation : Here $n_{1}, n_{2} & n_{3} are no. of electrons exhanged in first, second and combined half cells$

Discussion

1991.	(13) divided by (35) is ____.
Answer» $(\frac{1}{3})$ divided by $(\frac{3}{5})$ is ____.

Discussion

1992.	Decomposition is an important process for nutrient recycling and ecosystem functionality. Nitrogen fixing bacteria form an important part of the process. Choose the correct statement from the following. Nitrogen fixing bacteria:
Answer» Decomposition is an important process for nutrient recycling and ecosystem functionality. Nitrogen fixing bacteria form an important part of the process. Choose the correct statement from the following. Nitrogen fixing bacteria:

Discussion

1993.	In a discharge tube, do the cathode rays and anode rays travel in opposite directions simultaneously or it depends on which electrode is perforated?
Answer» In a discharge tube, do the cathode rays and anode rays travel in opposite directions simultaneously or it depends on which electrode is perforated?

Discussion

1994.	How many C4H10 molecules are contained in 9.213 gram of this Compound ? How many hydrogen atoms?
Answer» How many C4H10 molecules are contained in 9.213 gram of this Compound ? How many hydrogen atoms?

Discussion

1995.	What is the formula of reaction time
Answer» What is the formula of reaction time

Discussion

1996.	During which stage a caterpillar weaves a net to hold itself and then swings its head from side to side in the form of the figure of eight (8)?
Answer» During which stage a caterpillar weaves a net to hold itself and then swings its head from side to side in the form of the figure of eight (8)?

Discussion

1997.	Which of these will show no effect on blue litmus solution?
Answer» Which of these will show no effect on blue litmus solution?

Discussion

1998.	The following figure shows a change.
Answer» The following figure shows a change.

1998.

The following figure shows a change.

Answer»

The following figure shows a change.

Discussion

1999.	Which of the following property/properties do not describe a compound?
Answer» Which of the following property/properties do not describe a compound?

Discussion

2000.

Out of the following, which are the two terms related to silk production?Sericulture,floriculture, moriculture, apiculture and silvicultureHints: (i)Silk production involves cultivation of mulberry leavesand rearing silkworms.(ii)Scientific name of mulberry is Morus alba.

Answer»

Out of the following, which are the two terms related to silk production?

Sericulture,floriculture, moriculture, apiculture and silviculture

Hints: (i)Silk production involves cultivation of mulberry leavesand rearing silkworms.

(ii)Scientific name of mulberry is Morus alba.

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following is the most vital component present in all living forms?

What is meant by weak acid and weak base are strong electrolytes?

Why is the valency of oxygen 2?

No. of neutrons present in 23892Ur are:

39.A compressed cylinder of gas contain 1500 g of N2 gas at a pressure of 197.4 atm and a temperature of 17.1^° C. What volume of the gas has been released into the atmosphere if the final pressure in the cylinder is 1.77 atm? Assume ideal behaviour and that the gas temperature is unchanged.

Which of the following activities can help in the conservation of forests?

Why does rayon absorb more water than other synthetic fibres

Match the column 1 with 2 and select the correct option from the codes given below: Colomn 1. Colomn 2 ​​​​​​(Material). (Smell on burning) (a) silk. (I) burning plastic (b) wool. (ii) charred meat (c)nylon. (iii)burning hair

Question 3Which postulate of Dalton’s atomic theory is the result of the law of conservation ofmass?

Describe various steps of cleaning wastewater in a wastewater treatment plant.

Property of the metals due to which they can be beaten into sheets is known as

64. In a first order reaction that is A gives B .if K is rate constant and initial concentration of reactant A is 0.5 M then half life is .

The formula of a metal oxide is M2O3. If the metal forms its chloride, what will the formula of that compound be?

Which scientist among the following said that all matter is composed of small particles called atoms?

Curd is not stored in brass vessels .Why?

Define atomicity. What will be the atomicity of ozone and ammonia?

What is bromocresol green?

Which burns faster acrylic or cotton ?Which fibre among all burns faster

What is the valency of carbon in CH4 ?__

predict wether F2 reacts with Na E†extbullet CELLF2/F-=2.87 andE†extbullet Cell Na+/Na=-2.71

Why do woollen fibre and silk fibre smell the same when burnt?

mvr=n*h/2pi ; in these what is 'h'

Rate of the chemical reaction: nA→Products, is doubled when the concentration of A is increased four times. If the half time of the reaction at any temperature is 16 min, time required for 75% of the reaction to complete is:

How many metals are known today

True or falseA. Water does not get polluted by washing the cloths in running water of river.B. More the use of electric appliances, more will be the pollution.

What will be the value given by universal indicator for neutral solution?7

Molar conductivity for a compound AB is 145.0 S cm2 mol−1 and for CB is 110.1 S cm2 mol−1. Limiting molar conductivity for A+ is 73.5 S cm2 mol−1. What is the molar conductivity for C+?

Rivet is heated before fixing in the hole to join two metal plates. Why ?

For a cell Mg(s)|Mg2+(aq)||Ag+(aq)|Ag, find the maximum work (in kJ) that can be obtained by operating the cell.Eo(Mg2+/Mg)=−2.37 V, Eo(Ag+/Ag)=0.8 V

Find the value of y. 3Fe+yH2O→Fe3O4+4H2

148.Why carbon is not used as semiconductor

Explain why:(a) An antacid tablet is taken when you suffer from acidity.(b) Calamine solution is applied on the skin whenan ant bites.(c) Factory waste is neutralised before disposingit into the water bodies.

2.A and B are two elements which have same atomicweight and are having atomic number 27 and 30respectively. If the atomic weight of A is 57 thennumber of neutron in B is(1) 27 (2) 33 (3) 30 (4) 40:-

Statement A: Heating can bring about change. Statement B: Cooling can also bring about change. Select the correct option about the given statements.

The density of ice is ___________ that of water.

An atom X has 2 electrons greater than its nearest noble gas. What would be the formula of its:a) chlorideb) oxide

When two half cells of electrode potential E1 and E2 combine to form a cell of electrode potential E3 then choose the correct relation :Here n1,n2 &amp; n3 are no. of electrons exhanged in first, second and combined half cells

(13) divided by (35) is ____.

Decomposition is an important process for nutrient recycling and ecosystem functionality. Nitrogen fixing bacteria form an important part of the process. Choose the correct statement from the following. Nitrogen fixing bacteria:

In a discharge tube, do the cathode rays and anode rays travel in opposite directions simultaneously or it depends on which electrode is perforated?

How many C4H10 molecules are contained in 9.213 gram of this Compound ? How many hydrogen atoms?

What is the formula of reaction time

During which stage a caterpillar weaves a net to hold itself and then swings its head from side to side in the form of the figure of eight (8)?

Which of these will show no effect on blue litmus solution?

The following figure shows a change.

Which of the following property/properties do not describe a compound?

Out of the following, which are the two terms related to silk production?Sericulture,floriculture, moriculture, apiculture and silvicultureHints: (i)Silk production involves cultivation of mulberry leavesand rearing silkworms.(ii)Scientific name of mulberry is Morus alba.

Match the column 1 with 2 and select the correct option from the codes given below: Colomn 1. Colomn 2 (Material). (Smell on burning) (a) silk. (I) burning plastic (b) wool. (ii) charred meat (c)nylon. (iii)burning hair

When two half cells of electrode potential E1 and E2 combine to form a cell of electrode potential E3 then choose the correct relation :Here n1,n2 & n3 are no. of electrons exhanged in first, second and combined half cells