Hydrogen

MCQsQ1. One would expect proton to have very large(a) charge(b) ionization potential(c) hydration energy(d) radius.Ans. bQ2. The ionization of hydrogen atom would give rise to(a) hydride ion(b) hydronium ion(c) proton(d) hydroxyl ion.Ans. c.Q3.Which one of the following pairs of substances on reaction will not evolve H2 gas?(a)Copper and HCl (aqueous)(b)Iron and steam(c)Iron and H2SO4 (aqueous)(d)Sodium and ethyl alcoholAns. a Q4.Water gas is produced by(a)passing steam through a red hot coke(b)saturating hydrogen with moisture(c)mixing oxygen and hydrogen in the ratio of 1 : 2(d)heating a mixture of CO2 and CH4 in petroleum refineries.Ans. aQ5.Which of the following metal evolves hydrogen on reacting with cold dilute HNO3?(a)Mg (b) Al(c) Fe (d) CuAns. a6. Which of the following statements about hydrogen is incorrect?(a) Hydronium ion, H3O+ exists freely in solution.(b) Dihydrogen does not act as a reducing agent.(c) Hydrogen has three isotopes of which tritium is the most common.(d) Hydrogen never acts as cation in ionic salts.Ans. b and cQ7. Which of the following is electron-deficient?(a) (BH3)2 (b) PH3(c)  (CH3)2 (d) (SiH3)2Ans. aQ8. The method used to remove temporary hardness of water is(a) synthetic resins method(b) Calgon’s method(c) Clark’s method(d) ion-exchange method. Ans. cQ9. The number of hydrogen bonded water molecule(s) associated with CuSO4. 5H2O is(a) 3 (b) 1(c) 2 (d) 5Ans. dQ10. Which of the following groups of ions makes the water hard?(a) Sodium and bicarbonate(b) Magnesium and chloride(c) Potassium and sulphate(d) Ammonium and chlorideAns.bQ11. At its melting point, ice is lighter than water because(a) H2O molecules are more closely packed in solid state(b) ice crystals have hollow hexagonal arrangement of H2O molecules(c) on melting of ice the H2O molecules shrinks in size(d) ice forms mostly heavy water on first meltingAns. b13. The structure of H2O2 is(a) spherical (b) non-planar(c) planar (d) linearAns. b 14. The volume strength of 1.5 N H2O2 solutionis (a) 8.8(b) 8.4(c) 4.8(d) 5.2Ans. b15. The O – O – H bond angle in H2O2 is (a)  106° (b) 109°28(c) 120° (d) 97°Ans. d16. Hydrogen peroxide molecules are(a) monoatomic and form X 2– ions(b) diatomic and form X– ionsc. diatomic and form X- ionsd. monoatomic and form X- ionsAns. bQ17. In diborane how many 3c-2e- are therea. oneb. twoc. threed. fourAns. b. two18. The reaction of H2O2 with H2S is an example of ......... reaction.(a) addition (b) oxidation(c)  reduction (d) acidic Ans. b19. 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?(a)  (i) and (ii) (b) (i), (ii) and (iii)(c) (ii) and (iii) (d) (i) and (iii)Ans. a