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Hydrogen Class 11 MCQs Questions with Answers
Multiple Choice Type Questions
Question 1.
Which one of the following processes will produce hard water?
(a) Addition of Na2SO4 to water
(b) Saturation of water with CaCO3
(c) Saturation of water with MgCO3
(d) Saturation of water with CaSO4.
Answer
Answer: (d) Saturation of water with CaSO4.
Question 2.
Para and ortho hydrogen differ in
(a) Atomic number
(b) Atomic mass
(c) Spins of pruLoiis
(d) Number of neutrons
Answer
Answer: (c) Spins of pruLoiis
Question 3.
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
Answer: (c) CrO5 + H2O
Question 4.
Action of water or dilute mineral acids on metals can give
(a) Mono hydrogen
(b) Tritium
(c) Dihydrogen
(d) Trihydrogen
(e) D2
Answer
Answer: (c) Dihydrogen
Question 5.
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
Answer: (a) Na, H2, NaOH, Zn
Question 6.
Which of the following pairs of substances on reaction .will not evolve H2(g)?
(a) Fe and H2SO4
(b) Copper and HCl (aqueous)
(c) Sodium and ethyl alcohol
(d) Iron and steam
Answer
Answer: (b) Copper and HCl (aqueous)
Question 7.
The structure of H2O is
(a) Planar
(b) Non-planar
(c) Spherical
(d) Linear
Answer
Answer: (b) Non-planar
Question 8.
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
Answer: (b) Disodium salt of EDTA
Question 9.
Heavy water is obtained by
(a) Boiling water
(b) Fractional distillation of water
(c) Prolonged electrolysis of water
(d) Heating H2O2
Answer
Answer: (c) Prolonged electrolysis of water
Question 10.
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
Answer: (c) Form soluble complexes with cationic species
Question 11.
Amongst H2O, H2S, H2Se, and H2Te, the one with highest boiling point is
(a) H2O because of hydrogen bonding
(b) H2Te because of higher molecular weight
(c) H2S because of hydrogen bonding
(d) H2Se because of lower molecular weight.
Answer
Answer: (a) H2O because of hydrogen bonding
Question 12.
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
Answer: (d) Dipole moment
Question 13.
Hydrogen will not reduce
(a) Heated cupric oxide
(b) Heated ferric oxide
(c) Heated stannic oxide
(d) Heated aluminium oxide
Answer
Answer: (d) Heated aluminium oxide
Question 14.
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
Answer: (b) -1 and -2
Question 15.
What is heavy water?
(a) H\(_{2}^{18}\)C
(b) H\(_{2}^{16}\)C
(c) H2O3
(d) D2O
Answer
Answer: (d) D2O
Question 16.
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
Answer: (c) One mole of sulphuric acid and one mole of peroxomonosulphuric acid
Question 17.
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
Answer: (c) 1 cm³ of the solution liberates 30 cm³ of O2 at STP
Question 18.
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
Answer: (d) 224 ml.
Question 19.
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
Answer: (b) H2O < H2O2 < CO2
Question 20.
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
Answer: (c) both as oxidizing and reducing agent
Question 21.
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
Answer: (c) NH\(_{2}^{-}\)
Question 22.
Which of the following is a true peroxide?
(a) NO2
(b) MnO2
(c) BaO2
(d) SO2
Answer
Answer: (c) BaO2
Question 23.
What is false about H2O2?
(a) acts as both oxidising & reducing agent.
(b) two OH bonds lies in the same plane
(c) pale blue liquid.
(d) can be oxidised by O3
Answer
Answer: (b) two OH bonds lies in the same plane
Fill in the blanks
Question 1.
Ionic hydrides may be used as ……………….
Answer
Answer: Rocket fuel
Question 2.
In hydrides, hydrogen shows an oxidation stare of ……………….
Answer
Answer: -1
Question 3.
The p-block elements form ………………. hydrides.
Answer
Answer: covalent
Question 4.
Presence of Ca2+ & Mg2+ in water makes it ……………….
Answer
Answer: hard
Question 5.
Deuterium oxide is generally called ……………….
Answer
Answer: heavy water
Question 6.
heavy water is used as a ………………. in nuclear reactors.
Answer
Answer: moderator
Question 7.
The water molecule is highly ………………. in nature due to it’s bent structure.
Answer
Answer: polar
Question 8.
The oxidation number of oxygen in hydrogen peroxide is ……………….
Answer
Answer: -1
Question 9.
The three isotopes of hydrogen are ………………., ………………. & ……………….
Answer
Answer: Protium, deuterium & tritium
Question 10.
The hydrides become more ………………. on moving from left to right in a period of periodic table.
Answer
Answer: Acidic
Write True / False
Question 1.
Hydride ion is isoelectronic with helium.
Answer
Answer: True
Question 2.
Ionic hydrides react with water to give acidic solutions.
Answer
Answer: False
Question 3.
Deuterium is a stable isotope of hydrogen.
Answer
Answer: True
Question 4.
Li [AlH4] is a covalent hydride.
Answer
Answer: False
Question 5.
Hydrogen peroxide is a planar molecule.
Answer
Answer: False
Question 6.
Addition of hydrogen across a double/triple bond is termed hydrogenation.
Answer
Answer: True
Question 7.
All elements of gp 8 form electron deficient compounds.
Answer
Answer: True
Question 8.
bleaching action of H2O2 is due to the reduction process.
Answer
Answer: False
Question 9.
Water is an ionic hydride.
Answer
Answer: False
Question 10.
Upon electrolysis, moten hydrides give hydrogen at cathode.
Answer
Answer: False
Match the Following
| Column I | Column II |
| 1. Melting point of H2O | (a) 100°c |
| 2. Boiling point of H2O | (b) 0°C |
| 3. Melting point of D2O | (c) 101.41°C |
| 4. Boiling point of D2O | (d) 11.08 × 10² kg/m³ |
| 5. Density of D2O at 20 °C | (e) 3.79°C |
| 6. Per-hydrol | (f) Used as moderator |
| 7. Heavy water | (g) Used as an antiseptic & Germicide |
| 8. Symbol of Protium | (h) \(_{1}^{3}\)H |
| 9. Symbol of Deuterium | (i) \(_{1}^{1}\)H |
| 10. Symbol of Tritium | (j) \(_{1}^{2}\)H |
Answer
Answer:
| Column I | Column II |
| 1. Melting point of H2O | (b) 0°C |
| 2. Boiling point of H2O | (a) 100°c |
| 3. Melting point of D2O | (e) 3.79°C |
| 4. Boiling point of D2O | (c) 101.41°C |
| 5. Density of D2O at 20 °C | (d) 11.08 × 10² kg/m³ |
| 6. Per-hydrol | (g) Used as an antiseptic & Germicide |
| 7. Heavy water | (f) Used as moderator |
| 8. Symbol of Protium | (i) \(_{1}^{1}\)H |
| 9. Symbol of Deuterium | (j) \(_{1}^{2}\)H |
| 10. Symbol of Tritium | (h) \(_{1}^{3}\)H |
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