A.   +3 and +2

        B.   +2 and +5

        C.   +3 and +5

        D.   +3 and +6

        A.   Two

        B.   Three

        C.   One

        D.   None

        A.   Lone pair of electron on the nitrogen atom available for donation

        B.   The nitrogen atom being more electronegative than hydrogen draws the electron pair it shares with hydrogen to itself, and can therefore donate it

        C.   None of the above

        D.   All of the above

        A.   Dihalides

        B.   Pentahalides

        C.   Tetrahalides

        D.   Trihalides

        A.   Coke, charcoal and carbon black

        B.   Coke and charcoal

        C.   Charcoal and carbon black

        D.   Coke and carbon black

        A.   High purity

        B.   Hard structure

        C.   High refractive index and dispersive power

        D.   Crystalline nature

        A.   It is a gaseous compound

        B.   It has not attained the octet configuration

        C.   Its atoms are linked by triple bonds, making them unreactive except with atoms of low ionisation energies

        D.   Its small size and high electronegativity

        A.   It exist in molecular form

        B.   Multiple bonds between its atoms

        C.   The electrons are strongly attracted to the positive nucleus due to Its small size, hence its difficult to lose electron

        D.   It has only one oxidation state

        A.   Destructive distillation of coal and hardwood or bones in the absence of air

        B.   Pyrolysis of coal and hardwood or bones in the absence of air

        C.  A and B only

        D.   All of the above

        A.   Diamond

        B.   Graphite

        C.   Silicone

        D.   Quartz

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