Hydrogen - Chapter No 10

Right Answers have been shown below in red color.

1. Hydrogen is discovered by.

a) Cavendish
b) Dalton
c) Bohr
d) Rutherford

2. Hydrogen, at ordinary temperature and pressure exist in nature in the.

a) Solid state
b) Liquid state
c) Gaseous state
d) Plasma state

3. In 1766, first of all Cavendish prepared hydrogen by the action of Zn with.

a) Dil. H2SO4
b) Dil. HCl
c) Dil. HNO3
d) Dil. HNO2

4. The most abundant compound of hydrogen is.

a) H2SO4
b) CH4
c) NaOH
d) H20

5. Hydrogen atom contains.

a) One proton
b) Two protons
c) Three neutrons
d) No proton

6. The electron configuration of a hydrogen atom is.

a) 1s1, 2s1
b) 1s2
c) 1s1
d) 1s2 , 2s1

7. During the electrolysis of water, oxygen is liberated at the.

a) Diode
b) Tetrad
c) Cathode
d) Anode

8. The lightest gas in the universe is.

a) Nitrogen
b) Neon
c) Oxygen
d) Hydrogen

9. Hydrogen atoms contain only one electron in their outermost shell (1s1 ) like the atom of.

a) Halogens
b) Alkali metals
c) Noble gases
d) Alkaline earth metals

10. Like alkali metals the oxidation state of hydrogen is.

a) +1
b) -1
c) +2
d) -2

11. Hydrogen requires only _______ electron(s) to complete its outer most shell.

a) One
b) Two
c) Three
d) Four

12. Hydrogen loses an electron readily to form_________.

a) H
b) H+
c) H2
d) 1H2

14. In ordinary hydrogen gas the percentage of protium is.

a) 0.0156
b) 15.5
c) 99.98
d) 20.003

15. In deuterium atoms the number of neutrons is.

a) 0
b) 2
c) 1
d) 3

16. The atomic weight of the tritium isotope of hydrogen is.

a) 1
b) 2
c) 4
d) 3

17. When steam is passed over red hot coke at10000C it decomposes to give a mixture of CO and hydrogen gases called.

a) Water glass
b) Hot gas
c) Liquid gas
d) Water gas

18. CO gas is liquefied by liquid air.

a) -192ºC
b) 192ºC
c) -192ºF
d) 192ºF

19. The percentage purity of hydrogen gas, obtained by the hydrolysis of water, is.

a) 99%
b) 99.9%
c) 100%
d) 98%

20. Natural gas mostly consists of.

a) H2
b) CH4
c) N2
d) O2

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