Test Preparation on s-block Elements-I-Chemistry Test Series For NEET-2020

1.

Which one of the following substances is used in the laboratory
for a fast drying of neutral gases

1Phosphorus pentoxide
2Active charcoal
3Anhydrous calcium chloride
4Na3PO4

Anhydrous CaCl₂ is used for fast drying of neutral gases.

2.

1A
2B
3C
4D

3.

Which of the following statements about hydrogen is incorrect

(a) Hydrogen has three isotopes of which tritium is the most
common
(b) Hydrogen never acts as cation in ionic salts
(c) Hydronium ion, H₃O⁺ exists freely in solution
(d) Dihydrogen acts as a reducing agent

1A
2B
3C
4D

4.

1A
2B
3C
4D

5.

Hydrogen can be prepared by the action of dil. H₂SO₄ on

1Copper
2Iron
3Lead
4Mercury

Hydrogen cannot be prepared by the action of
dil. H₂SO₄ on copper or mercury as these two metals
can not displace hydrogen from acids. Action of
dil. H₂SO₄ on Pb stops after sometime due to the
formation of insoluble PbSO₄ . Only iron reacts rapidly
with dil. H₂SO₄ to give H₂ .


Right Ans	Wrong Ans	Not Attempted

Test Preparation on s-block Elements-I-Chemistry Test Series For NEET-2020

Which one of the following substances is used in the laboratoryfor a fast drying of neutral gases

Which of the following statements about hydrogen is incorrect (a) Hydrogen has three isotopes of which tritium is the mostcommon(b) Hydrogen never acts as cation in ionic salts(c) Hydronium ion, H3O+ exists freely in solution(d) Dihydrogen acts as a reducing agent

Hydrogen can be prepared by the action of dil. H2SO4 on

Check your progress:

Which one of the following substances is used in the laboratory
for a fast drying of neutral gases

Which of the following statements about hydrogen is incorrect

(a) Hydrogen has three isotopes of which tritium is the most
common
(b) Hydrogen never acts as cation in ionic salts
(c) Hydronium ion, H₃O⁺ exists freely in solution
(d) Dihydrogen acts as a reducing agent

Hydrogen can be prepared by the action of dil. H₂SO₄ on