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Ionic and covalent bonds are present in:
(1) CCl4
(2) CaCl2
(3) NH4 Cl
(4) H2O
Ans: NH4 Cl
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An atom with atomic number 20 is most likely to combine chemically with the atom whose atomic number is: (1) 11 (2) 14 (3) 16 (4) 10 An
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