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Highest covalent character is found in:
(a1 CaF2
(2) CaCl2
(3) CaBr2
(4) Cal2
Ans: Cal2
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The number of orbitals present in the shell with n= 4 is: (1) 16 (2) 8 (3) 18 (4) 32 Ans: 16
Lanthanide contraction
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Nitration or Direct method The number of - NO 2 groups introduced in benzene nucleus relies upon the nature and concentration of the nitrating agent, temperature of nitration
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