Chemistry solved Test Series, MCQ practice questions exclusively helpful for preparing Joint Entrance Examinations, JEE Main and Advanced, Medical and Engineering Entrance Exams, MBBS admission tests, NEST and other competitions.
Hydrogen and its Compounds (Topics / Syllabus):
Position of hydrogen in the periodic table; Discovery, Occurrence, Preparation, Properties and Industrial Applications of Hydrogen; Dihydrogen - Isotopes of hydrogen, Properties, Preparation and Uses of dihydrogen; Heavy Hydrogen or Deuterium; Tritium; Hydrides and their classification; Water - structure of water and ice, properties of water, hard and soft water, Hydrogen Peroxide; Heavy water.
Chemistry Solutions and Guide : Hydrogen and its Compounds
MCQ Test Series – Practice Questions - Set 2 (Q. No. 11-20)
Question 11: Normality of 100 volume H2O2 is –
a. 1.78
b. 8.9
c. 17.86
d. 0.89
Question 12: Nascent hydrogen consists of:
a. Hydrogen atoms with excess of energy
b. Hydrogen molecules with excess energy
c. Hydrogen ions in excited state
d. Solvated protons
Question 13: What is false about H2O2?
a. Acts both as oxidising and reducing agent
b. Two OH bonds lie in the same plane
c. Pale blue liquid
d. Can be oxidised by O3
Question 14: Heavy water is manufactured by:
a. Combination of hydrogen and heavier isotope of oxygen
b. Electrolysis of water containing heavy hydrogen dissolved in it
c. Repeated electrolysis of 3% aqueous solution of NaOH
d. None of the above
Question 15: The temporary hardness of water due to calcium bicarbonate can be removed by adding:
a. CaCO3
b. CaCl2
c. HCl
d. Ca(OH)2
Question 16: Solubility of NaCl in heavy water is –
a. Same as that in H2O
b. 15% lower than that in H2O
c. 15% more than that in H2O
d. 100% more than that in H2O
Question 17: Action of water or dilute mineral acids on metals can give:
a. Monohydrogen
b. Tritium
c. Dihydrogen
d. Trihydrogen
e. D2
Question 18: When hydrogen peroxide is treated with a cold acidified K2Cr2O7 solution containing ether, a blue colour is obtained. This is due to:
a. Chromium sulphate
b. Potassium chromate
c. Perchromic acid
d. Chromium trioxide
Question 19: The shape of water molecule is same as that of:
a. C2H2
b. CO2
c. NH3
d. Cl2O
Question 20: The correct order of dielectric constant values –
a. H2O > D2O > H2O2
b. H2O >H2O2>D2O
c. H2O<D2O>H2O2
d. H2O <H2O2<D2O
India Study Solution - Chemistry Solutions & Guide
hydrogen and its compounds
Solutions of Chemistry MCQ Test Series MCQ Practice Questions – Set 2 (Q.No. 11 – 20)
Answer 11: (c).
Answer 12: (b) Hint: Hydrogen at the moment of formation is known as Nascent Hydrogen. It is believed that part of energy liberated in the reaction producing hydrogen become associated with hydrogen molecules and thus, make them hyperactive.
Answer 13: (b) Hint: Two OH bonds lie in the different planes.
Answer 14: (c) Hint: Repeated electrolysis of 3% aqueous solution of NaOH.
Answer 15: (d). Answer 16: (b). Answer 17: (c).
Answer 18: (c) Hint: A solution of K2Cr2O7 in H2SO4 is oxidised to blue chromic acid by H2O2 and dissolve in ether to give blue coloured solution.
K2Cr2O7 + H2SO4 → K2SO4 + H2Cr2O7
H2Cr2O7 + 4H2O2 → 2CrO5 + 5H2O
_____________________________________________
K2Cr2O7 + H2SO4 + 4H2O2 → K2SO4 + 2CrO5 + 5H2O
Perchromic acid (blue)
_____________________________________________
Answer 19: (d). Answer 20: (a).
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