15280 + Interview Questions in Chemistry

1.	Define acids . differentiate between strong acids and weak acids
Answer» Define acids . differentiate between strong acids and weak acids

Discussion

2.	Why alloys are more better than metals ?
Answer» Why alloys are more better than metals ?

Discussion

3.	Marble chips reacts with a solution to produce a gas which turns lime water milky. So the solution contains:
Answer» Marble chips reacts with a solution to produce a gas which turns lime water milky. So the solution contains:

Discussion

4.	Identify the reducing agent in the following redox reaction: 5SO2−3+2MnO−4+6H+→5SO2−4+2Mn2++3H2O
Answer» Identify the reducing agent in the following redox reaction: $5 S O_{3}^{2 -} + 2 M n O_{4}^{-} + 6 H^{+} \to 5 S O_{4}^{2 -} + 2 M n^{2 +} + 3 H_{2} O$

4.

Identify the reducing agent in the following redox reaction: 5SO2−3+2MnO−4+6H+→5SO2−4+2Mn2++3H2O

Answer»

Identify the reducing agent in the following redox reaction:

$5 S O_{3}^{2 -} + 2 M n O_{4}^{-} + 6 H^{+} \to 5 S O_{4}^{2 -} + 2 M n^{2 +} + 3 H_{2} O$

Discussion

5.	The __ of a chemical reaction is defined as the change in the concentration of any one of the reactants or product per unit time.
Answer» The __ of a chemical reaction is defined as the change in the concentration of any one of the reactants or product per unit time.

Discussion

6.	What happens when sodium carbonate reacts with sulphuric acid?
Answer» What happens when sodium carbonate reacts with sulphuric acid?

Discussion

7.	Which of the following refining process is/are used for refining of zinc?
Answer» Which of the following refining process is/are used for refining of zinc?

Discussion

8.	Why unsaturated hydrocarbons decolourise bromine ?
Answer» Why unsaturated hydrocarbons decolourise bromine ?

Discussion

9.	One of the following does not happen during a chemical reaction. This is : (a) Breaking of old chemical bonds and formation of new chemical bonds (b) Formation of new substances with entirely different properties (c) Atoms of one element change into those of another element to form new products. (d) A rearrangement of atoms takes place to form new products.
Answer» One of the following does not happen during a chemical reaction. This is : (a) Breaking of old chemical bonds and formation of new chemical bonds (b) Formation of new substances with entirely different properties (c) Atoms of one element change into those of another element to form new products. (d) A rearrangement of atoms takes place to form new products.

9.

One of the following does not happen during a chemical reaction. This is : (a) Breaking of old chemical bonds and formation of new chemical bonds (b) Formation of new substances with entirely different properties (c) Atoms of one element change into those of another element to form new products. (d) A rearrangement of atoms takes place to form new products.

Answer»

One of the following does not happen during a chemical reaction. This is :

(a) Breaking of old chemical bonds and formation of new chemical bonds

(b) Formation of new substances with entirely different properties

(c) Atoms of one element change into those of another element to form new products.

(d) A rearrangement of atoms takes place to form new products.

Discussion

10.	Atomicity refers to the sum total of ____ of same or different elements present in a ____.
Answer» Atomicity refers to the sum total of ____ of same or different elements present in a ____.

Discussion

11.	What is the common name of methanol?
Answer» What is the common name of methanol?

Discussion

12.	Eka silicon predicted by Mendeleev is which element:
Answer» Eka silicon predicted by Mendeleev is which element:

Discussion

13.	Select the correct statements regarding metallic conduction.
Answer» Select the correct statements regarding metallic conduction.

Discussion

14.	What is the chemical name of the compound H3C−CH2−CH2−CH2−CH2−CH2−OH ?
Answer» What is the chemical name of the compound $H_{3} C - C H_{2} - C H_{2} - C H_{2} - C H_{2} - C H_{2} - O H$ ?

Discussion

15.	The oxidising agent for the following reaction is _______ . CH4 + 2O2 → CO2 + 2H2O
Answer» The oxidising agent for the following reaction is _______ . CH₄+ 2O₂ → CO₂ + 2H₂O

15.

The oxidising agent for the following reaction is _______ . CH4 + 2O2 → CO2 + 2H2O

Answer»

The oxidising agent for the following reaction is _______ .

CH₄+ 2O₂ → CO₂ + 2H₂O

Discussion

16.	Which of the following gas is produced when zinc sulphide reacts with sulphuric acid?
Answer» Which of the following gas is produced when zinc sulphide reacts with sulphuric acid?

Discussion

17.	Which of the following statement(s) is/are correct when iron reacts with concentrated sulphuric acid? i. Hydrogen gas is released. ii. The compound formed is ferric sulphate. iii. Sulphur dioxide gas is released.
Answer» Which of the following statement(s) is/are correct when iron reacts with concentrated sulphuric acid? i. Hydrogen gas is released. ii. The compound formed is ferric sulphate. iii. Sulphur dioxide gas is released.

17.

Which of the following statement(s) is/are correct when iron reacts with concentrated sulphuric acid? i. Hydrogen gas is released. ii. The compound formed is ferric sulphate. iii. Sulphur dioxide gas is released.

Answer»

Which of the following statement(s) is/are correct when iron reacts with concentrated sulphuric acid?

i. Hydrogen gas is released.

ii. The compound formed is ferric sulphate.

iii. Sulphur dioxide gas is released.

Discussion

18.	An electric kettle raises the temperature of the certain mass of water from 0∘C to 100∘C in 2.1 minutes. It takes 11.2 minutes to boil off the water. Calculate the specific heat of vaporization.
Answer» An electric kettle raises the temperature of the certain mass of water from 0 $^{\circ} C$ to 100 $^{\circ} C$ in 2.1 minutes. It takes 11.2 minutes to boil off the water. Calculate the specific heat of vaporization.

Discussion

19.	Select from the following group of these salts which may be dissolved in water to make it hard. (I) Sodium chloride (II) Sodium sulphate (III) Calcium chloride (IV) Calcium sulphate (V) Potassium chloride (VI) Magnesium sulphate
Answer» Select from the following group of these salts which may be dissolved in water to make it hard. (I) Sodium chloride (II) Sodium sulphate (III) Calcium chloride (IV) Calcium sulphate (V) Potassium chloride (VI) Magnesium sulphate

Discussion

20.	A student prepared an aqueous solution of CuSO4 in beaker X and an aqueous solution of FeSO4 in beaker Y. He then dropped some iron pieces in beaker X and some zinc pieces in beaker Y. After about 10 hours, he observed that the solution in X and Y respectively appear:
Answer» A student prepared an aqueous solution of CuSO₄ in beaker X and an aqueous solution of FeSO₄ in beaker Y. He then dropped some iron pieces in beaker X and some zinc pieces in beaker Y. After about 10 hours, he observed that the solution in X and Y respectively appear:

Discussion

21.	The element having configuration belongs to ns2(n−1)d1−10(n−2)f1−14
Answer» The element having configuration belongs to $n s^{2} (n - 1) d^{1 - 10} (n - 2) f^{1 - 14}$

Discussion

22.	The diagram given below shows an electrolytic cell used in the extraction of aluminium:\ Why is it necessary for electrode B to be continuously replaced?
Answer» The diagram given below shows an electrolytic cell used in the extraction of aluminium:\ Why is it necessary for electrode B to be continuously replaced?

22.

The diagram given below shows an electrolytic cell used in the extraction of aluminium:\ Why is it necessary for electrode B to be continuously replaced?

Answer»

The diagram given below shows an electrolytic cell used in the extraction of aluminium:\

Why is it necessary for electrode B to be continuously replaced?

Discussion

23.	The general formula for alcohol is:
Answer» The general formula for alcohol is:

Discussion

24.	Question 47(c) Mendeleev ′ predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. Classify these elements as metals, non-metals or metalloids
Answer» Question 47(c) Mendeleev ′ predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. Classify these elements as metals, non-metals or metalloids

Discussion

25.	Which of the following are not decomposition reactions?
Answer» Which of the following are not decomposition reactions?

Discussion

26.	What is the difference between the chemical nature of an aqueous solution of hydrogen chloride and an aqueous solution of ammonia?
Answer» What is the difference between the chemical nature of an aqueous solution of hydrogen chloride and an aqueous solution of ammonia?

Discussion

27.	What are biotic and abiotic factors? Explain with examples. [5 MARKS]
Answer» What are biotic and abiotic factors? Explain with examples. [5 MARKS]

Discussion

28.	Zinc metal is added to dilute hydrochloric acid. The gas evolved is : (a) Oxygen (b) Hydrogen (c) Chlorine (d) Carbon dioxide
Answer» Zinc metal is added to dilute hydrochloric acid. The gas evolved is : (a) Oxygen (b) Hydrogen (c) Chlorine (d) Carbon dioxide

Discussion

29.	Which of the following are weak acids?
Answer» Which of the following are weak acids?

Discussion

30.	Two substances of relative densities d1&d2 are mixed in equal volume and the relative density of the mixture is 4.when they are mixed in equal masses, the relative density of the mixture is 3.then the values of d1&d2 are
Answer» Two substances of relative densities d1&d2 are mixed in equal volume and the relative density of the mixture is 4.when they are mixed in equal masses, the relative density of the mixture is 3.then the values of d1&d2 are

Discussion

31.	How to determine the valnecy of radival??? What is there in h2so4 that makes it non volatile
Answer» How to determine the valnecy of radival??? What is there in h2so4 that makes it non volatile

31.

How to determine the valnecy of radival??? What is there in h2so4 that makes it non volatile

Answer»

How to determine the valnecy of radival???

What is there in h2so4 that makes it non volatile

Discussion

32.	An element X has an electronic configuration of 2, 8, 18, 8, 1. In this case, X will be ___ .
Answer» An element X has an electronic configuration of 2, 8, 18, 8, 1. In this case, X will be ___ .

Discussion

33.	What will happen if a strip of copper is kept immersed in a solution of silver nitrate (AgNO3)?
Answer» What will happen if a strip of copper is kept immersed in a solution of silver nitrate (AgNO₃)?

Discussion

34.	Methane exists as ___ at room temperature.
Answer» Methane exists as ___ at room temperature.

Discussion

35.	The molecular formula for 2,4-dimethylhexane is _____.
Answer» The molecular formula for 2,4-dimethylhexane is _____.

Discussion

36.	Why is gold and sliver found in free state
Answer» Why is gold and sliver found in free state

Discussion

37.	In the modern periodic table, nitrogen is placed just before oxygen in the 2nd period because:
Answer» In the modern periodic table, nitrogen is placed just before oxygen in the 2nd period because:

Discussion

38.	In general, alkanes
Answer» In general, alkanes

Discussion

39.	Arrange the metals in the decreasing order of their abundance in the earth's crust. [1 MARK] Iron, potassium, calcium, aluminium, sodium, magnesium
Answer» Arrange the metals in the decreasing order of their abundance in the earth's crust. [1 MARK] Iron, potassium, calcium, aluminium, sodium, magnesium

Discussion

40.	The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is : (a) electron (b) proton (c) neutron (d) meson
Answer» The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is : (a) electron (b) proton (c) neutron (d) meson

40.

The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is : (a) electron (b) proton (c) neutron (d) meson

Answer»

The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is :

(a) electron (b) proton (c) neutron (d) meson

Discussion

41.	A solid substance P which is very hard is used in the construction of many buildings, especially flooring. when substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water water the release of a lot of heat to form a substance S. When gas R is passed into a clear solution of substance S, then a white precipitable of substance T is formed . The substance T has the same chemical composition as starting substance P. (a) What is substance P ? Write its common name as well as chemical formula. (b) What is substance Q ? (c) What is gas R ? (d) What is substance S ? What is its clear solution known as ? (e) What is bustance T ? Name any two natural forms in which substance T occurs in nature.
Answer» A solid substance P which is very hard is used in the construction of many buildings, especially flooring. when substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water water the release of a lot of heat to form a substance S. When gas R is passed into a clear solution of substance S, then a white precipitable of substance T is formed . The substance T has the same chemical composition as starting substance P. (a) What is substance P ? Write its common name as well as chemical formula. (b) What is substance Q ? (c) What is gas R ? (d) What is substance S ? What is its clear solution known as ? (e) What is bustance T ? Name any two natural forms in which substance T occurs in nature.

41.

A solid substance P which is very hard is used in the construction of many buildings, especially flooring. when substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water water the release of a lot of heat to form a substance S. When gas R is passed into a clear solution of substance S, then a white precipitable of substance T is formed . The substance T has the same chemical composition as starting substance P. (a) What is substance P ? Write its common name as well as chemical formula. (b) What is substance Q ? (c) What is gas R ? (d) What is substance S ? What is its clear solution known as ? (e) What is bustance T ? Name any two natural forms in which substance T occurs in nature.

Answer»

A solid substance P which is very hard is used in the construction of many buildings, especially flooring. when substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water water the release of a lot of heat to form a substance S. When gas R is passed into a clear solution of substance S, then a white precipitable of substance T is formed . The substance T has the same chemical composition as starting substance P.

(a) What is substance P ? Write its common name as well as chemical formula.

(b) What is substance Q ?

(c) What is gas R ?

(d) What is substance S ? What is its clear solution known as ?

(e) What is bustance T ? Name any two natural forms in which substance T occurs in nature.

Discussion

42.	Complete the following reaction: CH≡CHH2O, 333K−−−−−−−−−→HgSO4+H2SO4tautomerism⇌
Answer» Complete the following reaction: $CH \equiv CH H_{2} O, 333 K - -------- \to {HgSO}_{4} + H_{2} {SO}_{4}$ $tautomerism ⇌$

Discussion

43.	What is the difference between the chemical composition of soaps and detergents? State in brief the action of soaps in removing an oily spot from a shirt. Why soaps are not considered suitable for washing where water is hard? OR List in tabular form three physical and two chemical properties on the basis of which ethanol and ethanoic acid can be differentiated.
Answer» What is the difference between the chemical composition of soaps and detergents? State in brief the action of soaps in removing an oily spot from a shirt. Why soaps are not considered suitable for washing where water is hard? OR List in tabular form three physical and two chemical properties on the basis of which ethanol and ethanoic acid can be differentiated.

43.

What is the difference between the chemical composition of soaps and detergents? State in brief the action of soaps in removing an oily spot from a shirt. Why soaps are not considered suitable for washing where water is hard? OR List in tabular form three physical and two chemical properties on the basis of which ethanol and ethanoic acid can be differentiated.

Answer»

What is the difference between the chemical composition of soaps and detergents? State in brief the action of soaps in removing an oily spot from a shirt. Why soaps are not considered suitable for washing where water is hard?

OR

List in tabular form three physical and two chemical properties on the basis of which ethanol and ethanoic acid can be differentiated.

Discussion

44.	Question 44 You are provided with two containers made up of copper and aluminium. You are also provided with solutions of dilute HCl, dilute HNO3,ZnCl2(aq) and H2O. In which of the above containers these solutions can be kept?
Answer» Question 44 You are provided with two containers made up of copper and aluminium. You are also provided with solutions of dilute $HCl$ , dilute ${HNO}_{3}, {ZnCl}_{2} (aq)$ and $H_{2} O$ . In which of the above containers these solutions can be kept?

Discussion

45.	What will happen when bases react with metals?
Answer» What will happen when bases react with metals?

Discussion

46.	When two atomic orbitals combine they form:
Answer» When two atomic orbitals combine they form:

Discussion

47.	What happens when sulfur trioxide reacts with water?
Answer» What happens when sulfur trioxide reacts with water?

Discussion

48.	Write the names and the formula of the products formed when : (a) methane, (b) ethane, reacts with : (i) chlorine (ii) bromine Write the chemical equations.
Answer» Write the names and the formula of the products formed when : (a) methane, (b) ethane, reacts with : (i) chlorine (ii) bromine Write the chemical equations.

Discussion

49.	The type of chemical bonding formed between the elements with atomic numbers 20 and 17
Answer» The type of chemical bonding formed between the elements with atomic numbers 20 and 17

Discussion

50.	Artificial sweetner which is stable under cold conditions only is
Answer» Artificial sweetner which is stable under cold conditions only is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Define acids . differentiate between strong acids and weak acids

Why alloys are more better than metals ?

Marble chips reacts with a solution to produce a gas which turns lime water milky. So the solution contains:

Identify the reducing agent in the following redox reaction: 5SO2−3+2MnO−4+6H+→5SO2−4+2Mn2++3H2O

The __ of a chemical reaction is defined as the change in the concentration of any one of the reactants or product per unit time.

What happens when sodium carbonate reacts with sulphuric acid?

Which of the following refining process is/are used for refining of zinc?

Why unsaturated hydrocarbons decolourise bromine ?

Atomicity refers to the sum total of ____ of same or different elements present in a ____.

What is the common name of methanol?

Eka silicon predicted by Mendeleev is which element:

Select the correct statements regarding metallic conduction.

What is the chemical name of the compound H3C−CH2−CH2−CH2−CH2−CH2−OH ?

The oxidising agent for the following reaction is _______ . CH4 + 2O2 → CO2 + 2H2O

Which of the following gas is produced when zinc sulphide reacts with sulphuric acid?

Which of the following statement(s) is/are correct when iron reacts with concentrated sulphuric acid? i. Hydrogen gas is released. ii. The compound formed is ferric sulphate. iii. Sulphur dioxide gas is released.

An electric kettle raises the temperature of the certain mass of water from 0∘C to 100∘C in 2.1 minutes. It takes 11.2 minutes to boil off the water. Calculate the specific heat of vaporization.

Select from the following group of these salts which may be dissolved in water to make it hard. (I) Sodium chloride (II) Sodium sulphate (III) Calcium chloride (IV) Calcium sulphate (V) Potassium chloride (VI) Magnesium sulphate

A student prepared an aqueous solution of CuSO4 in beaker X and an aqueous solution of FeSO4 in beaker Y. He then dropped some iron pieces in beaker X and some zinc pieces in beaker Y. After about 10 hours, he observed that the solution in X and Y respectively appear:

The element having configuration belongs to ns2(n−1)d1−10(n−2)f1−14

The diagram given below shows an electrolytic cell used in the extraction of aluminium:\ Why is it necessary for electrode B to be continuously replaced?

The general formula for alcohol is:

Question 47(c) Mendeleev ′ predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. Classify these elements as metals, non-metals or metalloids

Which of the following are not decomposition reactions?

What is the difference between the chemical nature of an aqueous solution of hydrogen chloride and an aqueous solution of ammonia?

What are biotic and abiotic factors? Explain with examples. [5 MARKS]

Zinc metal is added to dilute hydrochloric acid. The gas evolved is : (a) Oxygen (b) Hydrogen (c) Chlorine (d) Carbon dioxide

Which of the following are weak acids?

Two substances of relative densities d1&amp;d2 are mixed in equal volume and the relative density of the mixture is 4.when they are mixed in equal masses, the relative density of the mixture is 3.then the values of d1&amp;d2 are

How to determine the valnecy of radival??? What is there in h2so4 that makes it non volatile

An element X has an electronic configuration of 2, 8, 18, 8, 1. In this case, X will be ___ .

What will happen if a strip of copper is kept immersed in a solution of silver nitrate (AgNO3)?

Methane exists as ___ at room temperature.

The molecular formula for 2,4-dimethylhexane is _____.

Why is gold and sliver found in free state

In the modern periodic table, nitrogen is placed just before oxygen in the 2nd period because:

In general, alkanes

Arrange the metals in the decreasing order of their abundance in the earth's crust. [1 MARK] Iron, potassium, calcium, aluminium, sodium, magnesium

The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is : (a) electron (b) proton (c) neutron (d) meson

Complete the following reaction: CH≡CHH2O, 333K−−−−−−−−−→HgSO4+H2SO4tautomerism⇌

Question 44 You are provided with two containers made up of copper and aluminium. You are also provided with solutions of dilute HCl, dilute HNO3,ZnCl2(aq) and H2O. In which of the above containers these solutions can be kept?

What will happen when bases react with metals?

When two atomic orbitals combine they form:

What happens when sulfur trioxide reacts with water?

Write the names and the formula of the products formed when : (a) methane, (b) ethane, reacts with : (i) chlorine (ii) bromine Write the chemical equations.

The type of chemical bonding formed between the elements with atomic numbers 20 and 17

Artificial sweetner which is stable under cold conditions only is

Atomicity refers to the sum total of of same or different elements present in a .

Two substances of relative densities d1&d2 are mixed in equal volume and the relative density of the mixture is 4.when they are mixed in equal masses, the relative density of the mixture is 3.then the values of d1&d2 are