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
a) 2,8,8,1
Explanation:
This configuration (Potassium) has one valence electron that is easily lost to form a positive ion, which is the definition of an electropositive element.
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
a) Zinc rod became thinner
Explanation:
Zinc is more reactive than iron, so it displaces iron from the solution by dissolving, thus making the rod thinner.
53. Which of the following is not an organic compound?
a) Acetic acid
b) Chloroform
c) Ethanol
d) Water
d) Water
Explanation:
Organic compounds must contain carbon. Water (H2O) does not contain carbon and is therefore inorganic.
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
a) Catenation
Explanation:
Catenation is the unique ability of an element to form bonds with itself, creating long chains or rings.
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
c) Cu, Au, Ag
Explanation:
The correct order down the group in the periodic table is Copper (Cu), Silver (Ag), Gold (Au). The given sequence is incorrect.
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