10223 + Interview Questions in Chemistry

1.	Why is hydrogen peroxide written as H2O2 and not HO?
Answer» Why is hydrogen peroxide written as H₂O₂ and not HO?

Discussion

2.	Question 3 To make a saturated solution, 36 gm of sodium chloride is dissolved in 100 gm of water at 293 K. Find its concentration at this temperature.
Answer» Question 3 To make a saturated solution, 36 gm of sodium chloride is dissolved in 100 gm of water at 293 K. Find its concentration at this temperature.

Discussion

3.	Let's assume, CO gas is dissolved in water till the saturation level. If we will increase the temperature of the water then what will happen?
Answer» Let's assume, CO gas is dissolved in water till the saturation level. If we will increase the temperature of the water then what will happen?

Discussion

4.	The atomic number of an element having mass number 23 and number of neutron 12 is ________ .
Answer» The atomic number of an element having mass number 23 and number of neutron 12 is ________ .

Discussion

5.	Potash alum is an example of a:
Answer» Potash alum is an example of a:

Discussion

6.	Question 4 (c) Explain the following giving examples. c. Colloid
Answer» Question 4 (c) Explain the following giving examples. c. Colloid

Discussion

7.	In which of the following compounds, is the oxidation number of iodine is fractional
Answer» In which of the following compounds, is the oxidation number of iodine is fractional

7.

In which of the following compounds, is the oxidation number of iodine is fractional

Answer»

In which of the following compounds, is the oxidation number of iodine is fractional

Discussion

8.	Identify the isotopes of carbon.
Answer» Identify the isotopes of carbon.

Discussion

9.	What principle is applied in centrifugation? Give examples where this method is applied to separate mixtures. [3 MARKS]
Answer» What principle is applied in centrifugation? Give examples where this method is applied to separate mixtures. [3 MARKS]

Discussion

10.	State two physical properties on the basis of which metals can be distinguished from non-metals.
Answer» State two physical properties on the basis of which metals can be distinguished from non-metals.

Discussion

11.	Which of the following non metal is lustrous?
Answer» Which of the following non metal is lustrous?

Discussion

12.	How many moles of hydrogen atoms are present in 1 mole of H2O?
Answer» How many moles of hydrogen atoms are present in 1 mole of $H_{2} O$ ?

Discussion

13.	Which one of the following is not a condensation polymer ?
Answer» Which one of the following is not a condensation polymer ?

Discussion

14.	Which of the following process is generally used for extracting sodium metal?
Answer» Which of the following process is generally used for extracting sodium metal?

Discussion

15.	pH of a solution X is 13 and pH of another solution Y is 9. Then choose the correct statement: Statement 1: Solution X is more basic than solution Y. Statement 2: Solution Y is more basic than solution X. Statement 3: Solution Y has more OH− ion concentration than solution X. Statement 4: Solution X has more OH− ion concentration than solution Y. Statement 5: Solution Y has more H+ ion concentration than solution X. Statement 6: Solution X has more H+ ion concentration than solution Y.
Answer» pH of a solution X is 13 and pH of another solution Y is 9. Then choose the correct statement: Statement 1: Solution X is more basic than solution Y. Statement 2: Solution Y is more basic than solution X. Statement 3: Solution Y has more ${O H}^{-}$ ion concentration than solution X. Statement 4: Solution X has more ${O H}^{-}$ ion concentration than solution Y. Statement 5: Solution Y has more $H^{+}$ ion concentration than solution X. Statement 6: Solution X has more $H^{+}$ ion concentration than solution Y.

15.

pH of a solution X is 13 and pH of another solution Y is 9. Then choose the correct statement: Statement 1: Solution X is more basic than solution Y. Statement 2: Solution Y is more basic than solution X. Statement 3: Solution Y has more OH− ion concentration than solution X. Statement 4: Solution X has more OH− ion concentration than solution Y. Statement 5: Solution Y has more H+ ion concentration than solution X. Statement 6: Solution X has more H+ ion concentration than solution Y.

Answer»

pH of a solution X is 13 and pH of another solution Y is 9. Then choose the correct statement:

Statement 1: Solution X is more basic than solution Y.

Statement 2: Solution Y is more basic than solution X.

Statement 3: Solution Y has more ${O H}^{-}$ ion concentration than solution X.

Statement 4: Solution X has more ${O H}^{-}$ ion concentration than solution Y.

Statement 5: Solution Y has more $H^{+}$ ion concentration than solution X.

Statement 6: Solution X has more $H^{+}$ ion concentration than solution Y.

Discussion

16.	What is the difference between molecular formula, structural formula and skeletal formula?
Answer» What is the difference between molecular formula, structural formula and skeletal formula?

Discussion

17.	All the organism are basically made up of C,S,P,H,O and N . discuss how do they enter in living forms
Answer» All the organism are basically made up of C,S,P,H,O and N . discuss how do they enter in living forms

Discussion

18.	If an atom of an element has 34 electrons in total, then which orbit is the outermost orbit of the atom and how many valence electrons it contains?
Answer» If an atom of an element has 34 electrons in total, then which orbit is the outermost orbit of the atom and how many valence electrons it contains?

Discussion

19.	Which of these is an acid-base reaction and releases a gas that turns lime water milky?
Answer» Which of these is an acid-base reaction and releases a gas that turns lime water milky?

Discussion

20.	How to separate the constituents of a mixture containing sugar ,sand and sulphur powder
Answer» How to separate the constituents of a mixture containing sugar ,sand and sulphur powder

Discussion

21.	The ratio of the wave lengths of the first line in the Lyman series of the spetrum of Hydorgen atom and the first line in the Balmer series of the spectrum of He+ is
Answer» The ratio of the wave lengths of the first line in the Lyman series of the spetrum of Hydorgen atom and the first line in the Balmer series of the spectrum of $H e^{+}$ is

Discussion

22.	What is the approximate diameter of a molecule
Answer» What is the approximate diameter of a molecule

Discussion

23.	The increasing order of atomic radii of the following group 13 elements is:
Answer» The increasing order of atomic radii of the following group 13 elements is:

Discussion

24.	When dilute hydrochloric acid is added to iron filings, ___ reaction takes place.
Answer» When dilute hydrochloric acid is added to iron filings, ___ reaction takes place.

Discussion

25.	(a) Name two compounds that are covalent when taken pure but produce ions when dissolved in water. (b) For each compound mentioned above, give the formulae of ions formed in aqueous solutions.
Answer» (a) Name two compounds that are covalent when taken pure but produce ions when dissolved in water. (b) For each compound mentioned above, give the formulae of ions formed in aqueous solutions.

25.

(a) Name two compounds that are covalent when taken pure but produce ions when dissolved in water. (b) For each compound mentioned above, give the formulae of ions formed in aqueous solutions.

Answer»

(a) Name two compounds that are covalent when taken pure but produce ions when dissolved in water.

(b) For each compound mentioned above, give the formulae of ions formed in aqueous solutions.

Discussion

26.	How to separate a mixture of sand and sugar and I want only sugar.
Answer» How to separate a mixture of sand and sugar and I want only sugar.

Discussion

27.	The main difference between evaporation and boiling of water is the ___
Answer» The main difference between evaporation and boiling of water is the ___

Discussion

28.	Question 34 Under which category of mixtures will you classify alloys and why? (a) A solution is always a liquid. Comment. (b) Can a solution be heterogeneous?
Answer» Question 34 Under which category of mixtures will you classify alloys and why? (a) A solution is always a liquid. Comment. (b) Can a solution be heterogeneous?

Discussion

29.	What is the significance of the terms - ‘isolated gaseous atom’ and ‘ground state’ while defining the ionization enthalpy and electron gain enthalpy? Hint: Requirements for comparison purposes.
Answer» What is the significance of the terms - ‘isolated gaseous atom’ and ‘ground state’ while defining the ionization enthalpy and electron gain enthalpy? Hint: Requirements for comparison purposes.

Discussion

30.	For decolourization of 1 mole of KMnO4, the moles of H2O2 required is
Answer» For decolourization of 1 mole of $K M n O_{4}$ , the moles of $H_{2} O_{2}$ required is

Discussion

31.	The metal oxide which is reduced by hydrogen is _______ .
Answer» The metal oxide which is reduced by hydrogen is _______ .

Discussion

32.	Hydrogen chloride(HCl) reacts with metals to form:
Answer» Hydrogen chloride(HCl) reacts with metals to form:

Discussion

33.	State two charaacteristic properties each of : (a) a solid (b) a liquid (c) a gas
Answer» State two charaacteristic properties each of : (a) a solid (b) a liquid (c) a gas

33.

State two charaacteristic properties each of : (a) a solid (b) a liquid (c) a gas

Answer»

State two charaacteristic properties each of :

(a) a solid

(b) a liquid

(c) a gas

Discussion

34.	Which of the following method is used to separate a mixture of cooking oil and water?
Answer» Which of the following method is used to separate a mixture of cooking oil and water?

Discussion

35.	Heavy water is used in atomic reactor as-
Answer» Heavy water is used in atomic reactor as-

Discussion

36.	Fractional distillation of air was done, which all gases can be liquefied and found?
Answer» Fractional distillation of air was done, which all gases can be liquefied and found?

Discussion

37.	Explain the methods of preventing acid rain.
Answer» Explain the methods of preventing acid rain.

Discussion

38.	Normally, solubility of a crystalline solid increase with temperature. Does it increase uniformly in all cases ? Name a substance whose solubility : (a) increase rapidly withe temperature. (b) increase gradually with temperature. (c) increase slightly with temperature. (d) initially increases then decreases with rise in temperature.
Answer» Normally, solubility of a crystalline solid increase with temperature. Does it increase uniformly in all cases ? Name a substance whose solubility : (a) increase rapidly withe temperature. (b) increase gradually with temperature. (c) increase slightly with temperature. (d) initially increases then decreases with rise in temperature.

38.

Normally, solubility of a crystalline solid increase with temperature. Does it increase uniformly in all cases ? Name a substance whose solubility : (a) increase rapidly withe temperature. (b) increase gradually with temperature. (c) increase slightly with temperature. (d) initially increases then decreases with rise in temperature.

Answer»

Normally, solubility of a crystalline solid increase with temperature. Does it increase uniformly in all cases ? Name a substance whose solubility :

(a) increase rapidly withe temperature.

(b) increase gradually with temperature.

(c) increase slightly with temperature.

(d) initially increases then decreases with rise in temperature.

Discussion

39.	Correct the follwoing statements. (a) Volume of a gas is inversely proportional to its pressure at constant temperature. (b) Volume of a fixed mass of a gas is directly proportional to its temperature, pressure remaining constant. (c) 0∘C is equal to zero Kelvin. (d) standard temperature is 25∘C (e) Boiling point of water is 273 K.
Answer» Correct the follwoing statements. (a) Volume of a gas is inversely proportional to its pressure at constant temperature. (b) Volume of a fixed mass of a gas is directly proportional to its temperature, pressure remaining constant. (c) $0^{\circ} C$ is equal to zero Kelvin. (d) standard temperature is $25^{\circ} C$ (e) Boiling point of water is 273 K.

Discussion

40.	Pure copper sulphate can be obtained from an impure sample by the process of : (a) evaporation (b) fractional distillation (c) centrifugation (d) crystallisation
Answer» Pure copper sulphate can be obtained from an impure sample by the process of : (a) evaporation (b) fractional distillation (c) centrifugation (d) crystallisation

40.

Pure copper sulphate can be obtained from an impure sample by the process of : (a) evaporation (b) fractional distillation (c) centrifugation (d) crystallisation

Answer»

Pure copper sulphate can be obtained from an impure sample by the process of :

(a) evaporation (b) fractional distillation (c) centrifugation (d) crystallisation

Discussion

41.	Complete the following statements: (a) The chemical change involving iron and hydrochloric acid illustrates a ___ reaction. (b) In the type of reaction called ___ two compounds exchange their positive and negative redicals. (c) A catalyst either ___ or ___ the rate of a chemical change but itself remains ___ at the end of the reaction.
Answer» Complete the following statements: (a) The chemical change involving iron and hydrochloric acid illustrates a ___ reaction. (b) In the type of reaction called ___ two compounds exchange their positive and negative redicals. (c) A catalyst either ___ or ___ the rate of a chemical change but itself remains ___ at the end of the reaction.

41.

Complete the following statements: (a) The chemical change involving iron and hydrochloric acid illustrates a _ reaction. (b) In the type of reaction called _ two compounds exchange their positive and negative redicals. (c) A catalyst either _ or _ the rate of a chemical change but itself remains ___ at the end of the reaction.

Answer»

Complete the following statements:

(a) The chemical change involving iron and hydrochloric acid illustrates a ___ reaction.

(b) In the type of reaction called ___ two compounds exchange their positive and negative redicals.

(c) A catalyst either ___ or ___ the rate of a chemical change but itself remains ___ at the end of the reaction.

Discussion

42.	Valency of sulphide
Answer» Valency of sulphide

Discussion

43.	If a compound is made of sodium, carbon, and oxygen and their % composition are 43.4%, 11.3%, 45.3% respectively. What is the chemical formula of the compound?
Answer» If a compound is made of sodium, carbon, and oxygen and their % composition are 43.4%, 11.3%, 45.3% respectively. What is the chemical formula of the compound?

Discussion

44.	Why does a balloon make a boom sound when we prick it with a pin??
Answer» Why does a balloon make a boom sound when we prick it with a pin??

Discussion

45.	Write a brief note on the relation of kinetic energy of particles with the states of matter.
Answer» Write a brief note on the relation of kinetic energy of particles with the states of matter.

Discussion

46.	Question 34 Fill in the blanks in the following statements. (a) Rutherford's alpha-particle scattering experiment lead to the discovery of the ___ (b) Isotopes have the same ___ but different ___ (c) Neon and chlorine have atomic numbers 10 and 17 Their valencies will be ___ and ___ respectively. (d) The electronic configuration of silicon is ___ and that of sulphur is ___
Answer» Question 34 Fill in the blanks in the following statements. (a) Rutherford's alpha-particle scattering experiment lead to the discovery of the ___ (b) Isotopes have the same ___ but different ___ (c) Neon and chlorine have atomic numbers 10 and 17 Their valencies will be ___ and ___ respectively. (d) The electronic configuration of silicon is ___ and that of sulphur is ___

Discussion

47.	Considering the following molecules in liquid state, Weakest interparticle forces are present in:
Answer» Considering the following molecules in liquid state, Weakest interparticle forces are present in:

Discussion

48.	Radius of the nucleus is about _______ times less than the radius of the atom.
Answer» Radius of the nucleus is about _______ times less than the radius of the atom.

Discussion

49.	Which of the following reaction is/are correct?
Answer» Which of the following reaction is/are correct?

Discussion

50.	Which among the given options help in the production of bleaching powder?
Answer» Which among the given options help in the production of bleaching powder?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Why is hydrogen peroxide written as H2O2 and not HO?

Question 3 To make a saturated solution, 36 gm of sodium chloride is dissolved in 100 gm of water at 293 K. Find its concentration at this temperature.

Let's assume, CO gas is dissolved in water till the saturation level. If we will increase the temperature of the water then what will happen?

The atomic number of an element having mass number 23 and number of neutron 12 is ________ .

Potash alum is an example of a:

Question 4 (c) Explain the following giving examples. c. Colloid

In which of the following compounds, is the oxidation number of iodine is fractional

Identify the isotopes of carbon.

What principle is applied in centrifugation? Give examples where this method is applied to separate mixtures. [3 MARKS]

State two physical properties on the basis of which metals can be distinguished from non-metals.

Which of the following non metal is lustrous?

How many moles of hydrogen atoms are present in 1 mole of H2O?

Which one of the following is not a condensation polymer ?

Which of the following process is generally used for extracting sodium metal?

What is the difference between molecular formula, structural formula and skeletal formula?

All the organism are basically made up of C,S,P,H,O and N . discuss how do they enter in living forms

If an atom of an element has 34 electrons in total, then which orbit is the outermost orbit of the atom and how many valence electrons it contains?

Which of these is an acid-base reaction and releases a gas that turns lime water milky?

How to separate the constituents of a mixture containing sugar ,sand and sulphur powder

The ratio of the wave lengths of the first line in the Lyman series of the spetrum of Hydorgen atom and the first line in the Balmer series of the spectrum of He+ is

What is the approximate diameter of a molecule

The increasing order of atomic radii of the following group 13 elements is:

When dilute hydrochloric acid is added to iron filings, ___ reaction takes place.

(a) Name two compounds that are covalent when taken pure but produce ions when dissolved in water. (b) For each compound mentioned above, give the formulae of ions formed in aqueous solutions.

How to separate a mixture of sand and sugar and I want only sugar.

The main difference between evaporation and boiling of water is the ___

Question 34 Under which category of mixtures will you classify alloys and why? (a) A solution is always a liquid. Comment. (b) Can a solution be heterogeneous?

What is the significance of the terms - ‘isolated gaseous atom’ and ‘ground state’ while defining the ionization enthalpy and electron gain enthalpy? Hint: Requirements for comparison purposes.

For decolourization of 1 mole of KMnO4, the moles of H2O2 required is

The metal oxide which is reduced by hydrogen is _______ .

Hydrogen chloride(HCl) reacts with metals to form:

State two charaacteristic properties each of : (a) a solid (b) a liquid (c) a gas

Which of the following method is used to separate a mixture of cooking oil and water?

Heavy water is used in atomic reactor as-

Fractional distillation of air was done, which all gases can be liquefied and found?

Explain the methods of preventing acid rain.

Pure copper sulphate can be obtained from an impure sample by the process of : (a) evaporation (b) fractional distillation (c) centrifugation (d) crystallisation

Valency of sulphide

If a compound is made of sodium, carbon, and oxygen and their % composition are 43.4%, 11.3%, 45.3% respectively. What is the chemical formula of the compound?

Why does a balloon make a boom sound when we prick it with a pin??

Write a brief note on the relation of kinetic energy of particles with the states of matter.

Considering the following molecules in liquid state, Weakest interparticle forces are present in:

Radius of the nucleus is about _______ times less than the radius of the atom.

Which of the following reaction is/are correct?

Which among the given options help in the production of bleaching powder?