classification of elements, chemical bonding, periodicity in properties & physical transformation - Category wise Question and Answer Practice Test with Solutions

classification of elements, chemical bonding, periodicity in properties & physical transformation PRACTICE TEST [4 - EXERCISES]

set 1

set 2

set 3

set 4

Question : 1

On moving horizontally across a period, the number of electrons in the outermost shell increases from ...... to ....... .

a) 2, 18

b) 1, 8

c) 2, 8

d) 1, 18

Answer: (b)

Question : 2

Which one of the following is most electropositive element?

a) Calcium

b) Aluminium

c) Sodium

d) Silicon

Answer: (c)

Question : 3

The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?

a) Metalloid

b) Non-metal

c) Metal

d) Left-hand side element

Answer: (a)

The given element belongs to carbon family.

Question : 4

Which of the following is correct set of Dobereiner Triads?

a) Be, Mg, Ca

b) F, Cl, I

c) Na, Si, Cl

d) Li, Na, Be

Answer: (a)

Question : 5 [CDS]

A woman desires to clean the surface of her gold ornaments by a chemical approach. For this she requires to use

a) concentrated H2SO4

b) concentrated NaOH

c) aqua-regia

d) sodium thiosulphate solution

Answer: (c)

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