1) The number of known elements till now is a) 115 b) 114 c) 118 2) The triple covalent bond is formed in...... Molecule a) H2 b) N2 c) O2 d) H2o 3) Argon is...... Valency a) Zero b) Mono c) Divalent 4) From the igneous rocks a) Granite b) Basalt c) All the previous 5) From applications of force of inertia is.... a) Safety belt b) Car breaks c) Car tires

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