Multiple Choice Question For Practice: 9.Hydrogen:

9.Hydrogen:

1. Hydrogen is

a) electropositive

b) electronegative

c) Both electropositive as well as electronegative

d) Neither electropositive nor as electronegative

2. Number of neutrons in the nucleus of tritium is

(a) 1                                 (b) 2

(c) 3                                 (d) 4

3. Deuterium atom

(a) has the same atomic mass as a hydrogen atom

(b) has the same electronic configuration as hydrogen atom.

(c) has the same composition of the nucleus as the hydrogen atom.

(d) contains one more proton than a hydrogen atom.

4. The isotope of hydrogen which is radioactive is

(a) Tritium                        (b) Deuterium

(c) nascent hydrogen     (d) parahydrogen

5. Which of the following molecules have practically the same mass?

(a) H₂O and D₂O            (b) H₂O and HTO

(c) D₂O and HTO           (d) DTO and HDO

7. Hydrogen acts as an oxidising agent in the reactions with

(a) bromine                      (b) calcium

(c) nitrogen                      (d) sulphur

8. Hydrogen does not combine with

(a) Sb     (b) Na    (c) He     (d) Zn

9. In which of the following compounds does hydrogen have an oxidation state of — 1?

(a) CH₄     (b) NH₃     (c) HCl    (d) CaH₂

15. When H₂O₂ is oxidised by a suitable oxidant, one of the product is

(a) O^2-     (b) HO^2-     (c) OH^-     (d) O₂

16. On an industrial scale, H₂O₂ is prepared by auto oxidation of

(a) 2-Ethylanthraquinol

(b) 2-Ethylanthraquinone

(c) 1-Ethylanthraquinol

(d) 1-Ethylanthraquinone

17. Which of the following cannot be oxidised by H₂O₂?

(a) KI + HCl    (b) O₃    (c) PbS    (d) Na₂SO₃

18. H₂O₂ is always stored in black bottles because

(a) It is highly unstable

(b) Its enthalpy of dissociation is high

(c) It undergoes autooxidation on prolonged standing

(d) None of these

19. Reaction of H₂O₂ with ethylene gives

(a) Ethylene glycol      (b) Ethanol

(c) Ethanal                    (d) Ethane 

20. The decompostion of H₂O₂ can be checked By the addition of

(a) Alkali metal oxide    (b) Benzene

(c) Acetamide                 (d) MnO₂

21. Bleaching action of H₂O₂ is due to its

(a) Oxidising nature     (b) Reducing nature

(c) Acidic nature           (d) Thermal instability

10. S-block elements:

1. The  general  electronic  configuration of alkali , metal is

(a) ns¹                            (b) ns²

(c) ns² np¹                     (d) ns² np²

2. s-block elements are placed in

(a) 1^st and 2^nd group of periodic table

(b) 1^st group of periodic table

(c) 18^th group of periodic table

(d) 3^rd group of periodic table

3. The number of electrons in the outermost orbital of alkaline earth metals are

(a) 2               (b) 1                (c) 4               (d) 5

4. Which of the following configuration correspondsto alkaline earth metals?

(a) [Ne] 2s² 2p²           (b) [Ar] 4s²

(c)  [Ar] 3d¹⁰ 4s¹         (d) [Ar] 3d¹⁰ 4s²

5. Which of the following alkali metal is having

lowest melting point?

(a) Na     (b) K     (c) Rb     (d) Cs

6. Diagonal relationship is shown by the elements.

(a) Be and Mg                 (b) Li and Mg

(c) Li and Na                   (d) Be and Ba

7. The species having largest size is

(a) Na            (b) Na⁺            (c) K            (d) K⁺

8. Which one of the following metal is most reactive?

(a) Na            (b) K               (c) Mg        (d) Pb

9. The compound used in gun powder is

(a) NaNO₃            (b) KNO₃

(c) LiNO₃              (d) Mg(NO)₂

10. Which of the following has the highest first

ionization enthalpy?

(a) Ba        (b) Be             (c) Mg            (d) Ca

11. The most electronegative alkaline earth element is

(a) Be        (b) Mg           (c) Ra           (d) Ca

12. The least abundant alkaline earth elements is

(a) Barium            (b) Radium

(c) Magnesium    (d) Lithium

13. Which of the following ions has large ionic radius?

(a) Be²⁺            (b) Ba²⁺        (c) Sr          (d) Mg²⁺

14. The most reactive elements is

(a) Be               (b) Ba           (c) Sr         (d) Mg

15. Beryllium and aluminium have similar properties because

(a) they belong to same group

(b) they have same charge

(c) they have similar electronic configuration

(d) they have the same polarizing power

11. p-Block Elements:

1. An aqueous solution of boric acid is  

(a) acidic                           (b) neutral

(c) basic                            (d) amphoteric

2. The type of hybridization of boron in diborane is

(a) sp                                  (b) sp²

(c) sp³                                 (d) dsp²

3. Boric acid is polymeric due to

(a) its acidic nature

(b) the presence of hydrogen bonds

(c) its monobasic nature

(d) its geometry

4. Thermodynamically the most stable form of carbon is

(a) diamond                      (b) coal

(c) fullerene                      (d) graphite

  

5. Boric acid is prepared from borax by the action of

(a) sulphuric acid             (b) sodium hydroxide

(c) carbon dioxide            (d) sodium carbonate

6. Boron halides behave as Lewis acids because they

(a) are ionic compounds

(b) are covalent compounds

(c) have only six electrons in the valence shell                                    

(d) have a lone pair of electrons on boron atom

7. The compound commonly known as inorganic benzene is

(a) B₂H₆             (b) C₃N₃H₃         (c) B₃N₃H₆                 (d) B₃H₈

8. Boron when heated with carbon forms

(a) BC₂               (b) B₄C              (c) B₄C₃                       (d) B₂C₃

9. When strongly heated, orthoboric acid gives

(a) HBO₂            (b) H₂B₄O₇        (c) B₂O₃                      (d) B

10. The hardest substance is….

(a) Be₂C             (b) graphite     (c) B₄C                        (d) SiC

11. The carbon atoms in graphite are

(a) sp³-hybridised            (b) sp-hybridised

(c) sp³-hybridised             (d) dsp²-hybridised

12. Which allotropic form of carbon has a two dimensional sheet like structure?

(a) coal               (b) coke           (c) graphite               (d) diamond

13. The nature of chemical bonding in graphite is

(a) covalent                      (b) ionic

(c) co-ordinate                 (d) metallic

14. The different layers in graphite are held by

(a) ionic bonding             (b) metallic bonding

(c) covalent bonding       (d) van der Walls forces

15. Carbon atoms in diamond are arranged in

(a) planner configuration  (b) tetrahedral configuration

(c) linear configuration      (d) octahedral configuration

16. Graphite is

(a) harder than diamond

(b) used as lubricant

(c) an amphorphous allotropic form of carbon                                      

(d) oil like substance

17. The element which occurs both in a very hard and very soft form is,

(a) Si                   (b) C                  (c) Sn                         (d) Pb

18. Carbon monoxide is,

(a) neutral          (b) basic          (c) acidic                   (d) amphoteric

19. Dry ice is

(a) solid CO₂                     (b) solid SO₂

(c) solid Br₂                       (d) solid CO

20. In Buckminsterfullerene, each carbon atom is

(a) sp-hybridized             (b) sp²-hybridized

(c) sp³-hybridized            (d) dsp²-hybridized

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