Classification Of Elements, Chemical Bonding, Periodicity In Properties & Physical Transformation - Category Wise Question And Answer Practice Test With Solutions

Question : 16 [NDA]

Calcium carbonate is naturally available as limestone and can also be synthesized from quick lime. It is seen that the compositions of the elements in both the natural and synthetic calcium carbonate are same. The validity of which one among the following laws is confirmed by this observation?

a) Law of definite proportion

b) Law of multiple proportion

c) Law of conservation of mass

d) Avogadro’s law

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Question : 17 [CDS]

Which one of the following reducing agents can also act as an oxidising agent?

a) H₂S

b) SO₂

c) H₂

d) HI

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Question : 18

The most metallic element in the fourth period is

a) K

b) S

c) Ca

d) P

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Question : 19

The element with smallest size in group 13 is

a) carbon

b) aluminium

c) beryllium

d) boron

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Question : 20

Which of the following statements are true about the quantum numbers n, l, m and s?

1. l gives an idea of the shape of the orbital
2. m gives the information of the energy of electron in a given orbital
3. n gives the idea of the size of the orbital
4. s gives the direction of spin of electron in an orbital

a) 1, 2 and 3

b) 1, 3 and 4

c) 2, 3 and 4

d) 1, 2 and 4

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