Question

(5)
(b) Choose the correct answer from the options given below:
(0) Element were known when Mendeleev presented the periodic table.
A. 63
B. 80
C. 92
D. 102
(ii) According to the modern periodic law, the properties of elements are a periodic function of their:
B. Atomic number
A. Atomic volume
D. Mass number
C. Atomic weight
(iii) Which of the following has water of crystallization?
A. Potassium chloride B. Sodium chloride C. Sodium nitrate D. Washing soda crystals
(iv) The gas which has a rotten egg smell is:
D. Hydrogen chloride
C. Sulphur dioxide
A. Hydrogen sulphide B. Ammonia
(!)​

Answer 1

i.) 63

ii.) atomic number

iiit.) washing soda crystals

iv.) hydrogen sulphide