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46. Benzene has ___ number of covalent bonds (NTSE Rajasthan, Stage-I, 2014-15)
6
9
12
15
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47. An atom of an element (X) has its K, Land M shells filled with some electrons. It reacts with sodium metal to form a compound NaX. The number of electrons in the M shell of the atom (X) will be (NTSE Stage-II,2014-15)
Eight
Seven
Two
One
48. The example of thermosetting plastiC is (NTSE Uttar Pradesh, Stage-I, 2015-16)
Polythene
Polyvinyl chloride
Bakelite
Polystyrene
49. MP04 is the formula of phosphate of an element. The molecular formula of its nitrate will be (NTSE Uttar Pradesh, Stage-I, 2015-16)
MN03
M(N03)3
M2(N03)
M(N03)2
50. How many grams of oxygen gas is essentially required for complete combustion of 3 moles of utane gas? (NTSE Delhi, Stage-I, 2016-17)
624g
312 g
128g
64 g
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