Question

Read the following and answer any FOUR questions from 18 (i) to 18 (v)

(i) One limitation of Mendeléev's classification is that it could not assign a position to

hydrogen. Hydrogen resembles alkali metals in the combination with halogens

,oxygen and sulphur. On the other hand, hydrogen resembles halogens in that it exists

as a diatomic molecule and it combines with metals and non-metals to form covalent

compounds.

(ii) Mendeléev's classification cannot assign position to isotopes. Isotopes are an

element having same atomic numbers (similar chemical properties) but different

atomic mass. e.g. Isotopes of chlorine Cl-35 and Cl-37 have atomic masses 35 and

37 respectively. As they have the same atomic number 17, they possess same

chemical properties. We cannot assign them different position in the periodic table

simply because they have different atomic masses. As they show same chemical

properties, they are placed in the same position.

1x4

18-i Hydrogen resembles alkali metals in the combination with halogens. Its compound formed

with halogens will be –

a. HX

b. HX2

c. H2X

d. H2X2

18-ii The atomic masses of element P and Q are 6 and 7 and their atomic number are 3

a. Their chemical properties are same.

b. Their chemical and physical properties both are same.

c. Their physical properties are same.

d. Cannot say anything about their chemical properties.

18-iii Mendeléev's classification cannot assign position to

a. Hydrogen

b. Isotopes

c. Hydrogen and Isotopes

d. Hydrogen, Oxygen and Sulphur

18-iv Hydrogen resembles halogens in that it exists as a

a. monoatomic molecule

b. diatomic molecule

c. triatomic molecule

d. all the above

18-v Hydrogen combines with metals and non-metals to form

a. Ionic compounds

b. covalent compounds.

c. Ionic and covalent compounds both

d. Either ionic or covalent compounds​

Answer 1

Answer:

1 a, 2 b , 3 c , 4 b, 5 b hope it helps you