#### 11th Standard Chemistry Hydrogen English Medium Free Online Test One Mark Questions 2020 - 2021

11th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20

20 x 1 = 20
1. Which of the following statements about hydrogen is incorrect?

(a)

Hydrogen ion, H3O+ exists freely in solution.

(b)

Dihydrogen acts 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

2. If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be

(a)

1.2 g

(b)

2.4 g

(c)

3.6 g

(d)

$\sqrt{4.8}$g

3. The cause of permanent hardness of water is due to

(a)

Ca(HCO3)2

(b)

Mg(HCO3)2

(c)

CaCl2

(d)

MgCO3

4. A commercial sample of hydrogen peroxide marked as 100 volume H2O2, it means that

(a)

1 ml of H2O2 will give 100 ml O2 at STP

(b)

1 L of H2O2 will give 100 ml O2 at STP

(c)

1 L of H2O2 will give 22.4 L O2

(d)

1 ml of H2O2  will give 1 mole of O2 at STP

5. For decolorisation of 1 mole of acidified KMnO4, the moles of H2O2 required is

(a)

$\frac{1}{2}$

(b)

$\frac{3}{2}$

(c)

$\frac{5}{2}$

(d)

$\frac{7}{2}$

6. The hybridisation of oxygen atom is H2O and H2O2 are, respectively

(a)

sp and Sp3

(b)

sp and sp

(c)

Sp and Sp2

(d)

Sp3and Sp3

7. In solid ice, oxygen atom is surrounded

(a)

tetrahedrally by 4 hydrogen atoms

(b)

octahedrally by 2 oxygen and 4 hydrogen atoms

(c)

tetrahedrally by 2 hydrogen and 2 oxygen atoms

(d)

octahedrally by 6 hydrogen atoms

8. The most abundant element in the universe is _________.

(a)

aluminium

(b)

mica

(c)

dihydrogen

(d)

nitrogen

9. _____________ is known as heavy hydrogen.

(a)

protium

(b)

deuterium

(c)

tritium

(d)

both a and b

10. The half life period of Tritium is ___________

(a)

12.33 secs

(b)

12.33 mins

(c)

12.33 hrs

(d)

12.33 years

11. ___________ torches is/are used in cutting and welding of a steel.

(a)

Oxy acetylene

(b)

Oxy hydrogen

(c)

both a and b

(d)

neither a nor b

12. The conversion of atomic hydrogen to dihydrogen is a __________ change.

(a)

endothermic

(b)

exothermic

(c)

photochemical

(d)

nuclear

13. Hydrogen burns in air with a - flame.

(a)

light blusish

(b)

yellow

(c)

green

(d)

none of these

14. Hydrogen acts as a reducing agent and thus resembles

(a)

halogens

(b)

chalogens

(c)

inert gases

(d)

alkali metals

15. In which of the following compounds does hydrogen has an oxidation state of -1?

(a)

CH4

(b)

NH3

(c)

HCl

(d)

CaH2

16. Consider the following statements
1. Water has high dielectric constant.
2. Water has strong intra molecular hydrogen bonding
3. Water is an Universal solvent
Which of the following statement(s) given above is are not correct

(a)

1 & 3

(b)

only 1

(c)

2 & 3

(d)

only 2

17. Match the list I with List II and select the correct answer using. the code given below the lists.

 List I List II A Calcium hydrogen carbonate 1 Permanent hardness B Calcium chloride 2 Chelating C Sodium aluminium  silicate 3 Temporary hardness D EDTA 4 Ion exchange method
(a)
 A B C D 1 3 2 4
(b)
 A B C D 4 3 1 2
(c)
 A B C D 3 1 4 2
(d)
 A B C D 2 1 4 3
18. The structure of water molecule is __________

(a)

bent.

(b)

tetrahedral

(c)

distorted octahedral

(d)

trigonal bi pyramidal

19. FeSO4 contains _________ molecules of water of hydration.

(a)

5

(b)

7

(c)

10

(d)

12

20. Hardness of water cannot be removed by

(a)

treating with washing soda

(b)

(c)

boiling

(d)