Hydrogen and its Compounds  

1. The total number of isotopes of hydrogen and number of radioactive isotopes among them respectively are
1) 2 and 0          2) 3 and 2            3) 3 and 1             4) 2 and 1
 

2. The correct statements among a to d are
a) Saline hydrides produce H₂ gas when reacted with H₂O
b) Reaction of LiAlH₄ with BF₃ leads to B₂H₆
c) PH₃ and CH₄ are electron-rich and electron-precise hydrides respectively
d) HF and CH₄ are called as molecular hydrides
1) c and d only      2) a, b, c and d         3) a, c and d only          4) a, b and c only
 

3. The metal that gives hydrogen gas upon treatment with both acid as well as base is
1) Magnesium            2) Zinc          3) Mercury          4) Iron
 

4. The ionization of hydrogen atom would give rise to
1) hydride          2) hydronium ion        3) proton          4) hydroxyl ion
 

5. Some statements about heavy water are given below 
i) Heavy water is used as a moderator in nuclear reactors
ii) Heavy water is more associated than ordinary water
iii) Heavy water is more effective solvent than ordinary water Which of the above statements are correct?
1) i and ii            2) i, ii and iii           3) ii and iii           4) i and iii
 

6. Which of the following could act as a propellant for rockets?
1) Liquid hydrogen + Liquid nitrogen
2) Liquid oxygen + Liquid argon
3) Liquid hydrogen + Liquid oxygen
4) Liquid nitrogen + Liquid oxygen
 

7. The O-O-H bond angle in H₂O₂ is
1) 106°        2) 109° 28'           3) 120°         4) 97°

8. The volume strength of 1.5 N H₂O₂ solution is
1) 8.8         2) 8.4          3) 4.8         4) 5.2
 

9. The chemical nature of hydrogen peroxide is
1) oxidising and reducing agent in acidic medium but not in basic medium
2) oxidising and reducing agent in both acidic and basic medium
3) reducing agent in basic medium but not in acidic medium
4) oxidising agent in acidic medium but not in basic medium
 

10. Calgon used as water softener is
1) Na₂[Na₄(PO₃)₆]             2) Na₄[Na₂(PO₃)]
3) Na₂[Na(PO₄)₅]             4) Na₄[Na₂(PO₄)₆]
 

11. Permanent hardness of water is due to
1) carbonates and sulphates of Ca and Mg
2) chlorides and sulphates of Ca and Mg
3) nitrates of Ca and Mg
4) bicarbonates of Ca and Mg
 

12. The oxidation states of the most electronegative element in the products of the reaction of BaO₂ with dil.H₂SO₄ are
1) 0 and -1        2) -1 and -2        3) -2 and 0         4) -2 and +1
 

13. Which of the following on oxidation gives H₂O₂?
1) Anthracene                 2) 2-Ethyl anthracene  
3) 2-Ethyl anthraquinone        4) 2-Ethyl anthraquinol
 

Answers: 1-3;  2-2;  3-2;  4-3;  5-1;  6-3;  7-4;  8- 2;  9-2; 10-1;  11-2;  12-2;  13-4.