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Hydrogen Class 11 MCQs Questions with Answers
Acidified solution of chromic acid on treatment with H2O2 yields
(a) CrO3 + H2O + O3
(b) Cr2O3 + H2O + O2
(c) CrO5 + H2O
(b) H2Cr2O7 + H2O + O2
Answer: (c) CrO5 + H2O
When a substance A reacts with water, it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with the solution of C, it produces the same gas B on warming, but D can produce B on reaction with dilute sulphuric acid at room temperature.
A imparts a deep yellow colour to a smokeless flame of Bunsen burner. A, B, C, D respectively are
(a) Na, H2, NaOH, Zn
(b) K, H2, KOH, Al
(c) Ca, H2, Ca(OH)2, Sn
(d) CaC2, C2H2, Ca(OH)2, Fe
Answer: (a) Na, H2, NaOH, Zn
H2O2 used in rocket has the concentration
(a) 50%
(b) 90%
(c) 70%
(d) 30%
Answer: (b) 90%
Tritium _____ radio active isotope.
(a) Beta-Emitting
(b) Alpha – Emitting
(c) Gamma-Emitting
(d) None of the Above
Answer: (a) Beta-Emitting
Hydrogen bond energy is equal to
(a) 3-10 kcals
(b) 3-7 cals
(c) 30-70 cals
(d) 30-70 kcals
Answer: (a) 3-10 kcals
Water shows anomalous behavior between
(a) 0 to 4 °C
(b) 0 to 5 °C
(c) 0 to -4 °C
(d) 4 to 0 °C
Answer: (a) 0 to 4 °C
The freezing point of heavy water is
(a) 0°C
(b) 3.8°C
(c) 4°C
(d) 1°C
Answer: (b) 3.8°C
When water is dropped over sodium peroxide, the colourless gas produced is:
(a) DiNitrogen
(b) DiOxygen
(c) DiHydrogen
(d) Hydrogen Peroxide
Answer: (b) DiOxygen
Elements of which of the following group(s) of periodic table do not form hydrides.
(a) Groups 7, 8, 9
(b) Group 13
(c) Groups 15, 16, 17
(d) Group 14
Answer: (a) Groups 7, 8, 9
Polyphosphates are used as water softening agents because they
(a) Form soluble complexes with an ionic species
(b) Precipitate an ionic species
(c) Form soluble complexes with cationic species
(d) Precipitate cationic species
Answer: (c) Form soluble complexes with cationic species
Zeolite used to soften hardness of water is hydrated
(a) Potassium aluminium borate
(b) Sodium aluminium silicate
(c) Calcium aluminium silicate
(d) Zinc aluminum borate
Answer: (b) Sodium aluminium silicate
_________________ on water decolourises H2O2
(a) O3
(b) Acidic KMnO4 solution
(c) Black Suspension of Lead Sulphide(PbS)
(d) None of these.
Answer: (c) Black Suspension of Lead Sulphide(PbS)
The correct increasing order of the acidity of CO2, H2O and H2O2 is
(a) CO2 < H2O2 < H2O
(b) H2O < H2O2 < CO2
(c) H2O < H2O2 > CO2
(d) H2O2 > CO2 > H2O
Answer: (b) H2O < H2O2 < CO2
Hydrolysis of one mole of Peroxidic sulphuric acid produces
(a) Two moles of sulphuric acid
(b) Two moles of peroxomonosulphuric acid
(c) One mole of sulphuric acid and one mole of peroxomonosulphuric acid
(d) One mole of sulphuric acid, and one mole of peroxomonosulphuric acid and one mole of hydrogen peroxide
Answer: (c) One mole of sulphuric acid and one mole of peroxomonosulphuric acid
The oxidation states of the most electronegative element in the products of the reaction BaO2 with dil. H2SO4 are
(a) 0 and -1
(b) -1 and -2
(c) -2 and 0
(d) -2 and +1
Answer: (b) -1 and -2
What is gram equivalent weight of hydrogen peroxide as reductant?
(a) 100
(b) 125
(c) 152
(d) None of the Above
Answer: (c) 152
The volume of 10 volume H2O2 solution that decolourises 200 ml. of 2N KMnO4 solution in acidic medium is
(a) 112 ml
(b) 336 ml
(c) 200 ml
(d) 224 ml
Answer: (d) 224 ml
Which of the following statements is most applicable to hydrogen? It can act
(a) as a reducing agent
(b) as an oxidizing agent
(c) both as oxidizing and reducing agent
(d) neither as an oxidising agent nor as a reducing agent
Answer: (c) both as oxidizing and reducing agent
30 volumes of H2O2 means
(a) 30% H2O2
(b) 30 cm³ of the solution, contains lg of H2O2
(c) 1 cm³ of the solution liberates 30 cm³ of O2 at STP
(d) 30 cm³ of the solution contain 1 mole of H2O2
Answer: (c) 1 cm³ of the solution liberates 30 cm³ of O2 at STP
The critical temperature of water is higher than that of O2 because the H2O molecule has
(a) Fewer electrons than oxygen
(b) Two covalent bonds
(c) v-shape
(d) Dipole moment
Answer: (d) Dipole moment
Hydrogen has isotopes
(a) 2
(b) 3
(c) 4
(d) 5
Answer: (c) 4
The volume strength of 1.5 NH2O2 solution is :
(a) 4.8
(b) 5.2
(c) 8.8
(d) 8.4
Answer: (d) 8.4
The volume of oxygen gas evolved at STP by decomposition of 0.68 g “20 volume” hydrogen peroxide is:
(a) 112 ml
(b) 224 ml
(c) 56 ml
(d) 336 ml
Answer: (b) 224 ml
What is heavy water?
(a) H182C
(b) H162C
(c) H2O3
(d) D2O
Answer: (d) D2O
Hydrogen will not reduce
(a) Heated cupric oxide
(b) Heated ferric oxide
(c) Heated stannic oxide
(d) Heated aluminium oxide
Answer: (d) Heated aluminium oxide
Which of the following hydrides are generally nonstochiometric in nature?
(a) Ionic Hydrides
(b) Molecular Hydrides
(c) Interstitial Hydrides
(d) All of the Above.
Answer: (c) Interstitial Hydrides
Atomic hydrogen is called
(a) Protium
(b) Deutrium
(c) Nascent Hydrogen
(d) Tritium
Answer: (c) Nascent Hydrogen
Which one of the following ionic species has the greatest proton affinity to form stable compounds.
(a) I–
(b) HS–
(c) NH–2
(d) F–
Answer: (c) NH−2
The reagent commonly used to determine hardness of water titrimetrically is
(a) Oxalic acid
(b) Disodium salt of EDTA
(c) Sodium citrate
(d) Sodium thiosulphate
Answer: (b) Disodium salt of EDTA
The volume of 10 volume H2O2 required to liberate 500 ml of O2 at S.T.P. is :
(a) 25 ml
(b) 50 ml
(c) 100 ml
(d) 125 ml
Answer: (b) 50 ml
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