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
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
53. Which of the following is not an organic compound?
a) Acetic acid
b) Chloroform
c) Ethanol
d) Water
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
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