51. Which of the following electronic configuration represents an electropositive element?
a)2,8,8,1
b) 2,8,8
c) 2,8,6
d) 2,7
Explanation:
52. A student placed a zinc rod in FeSO4 solution. after ten hours the rod was taken out and it was observed that:
a) Zinc rod became thinner
b) Zinc rod became thicker due to iron deposition
c) Zinc rod remains as it was
d) Zinc rod has holes
Explanation:
53. Which of the following is not an organic compound?
a) Acetic acid
b) Chloroform
c) Ethanol
d) Water
Explanation:
54. The property by which a large number of atoms of the same element get linked through covalent bonds forming long chains is called:
a) Catenation
b) Polymerisation
c) Allotropy
d) Addition reaction
Explanation:
55. Identify the wrong sequence of elements in a group:
a) Ca, Sr, Ba
b) N, P, As
c) Cu, Au, Ag
d) Cl, Br, I
Explanation: