IGCSE Chemistry 0620/21/O/N/21 Q28

Question

28 Which statements about the thermal decomposition of copper(II) nitrate are correct?

1 A brown gas is given off.
2 A gas which relights a glowing splint is given off.
3 The solid residue is an acidic oxide.

A 1 only    B 1 and 2    C 1 and 3    D 2 and 3

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Answer ( 1 )

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    2022-05-11T17:42:25+08:00

    Thermal decomposition of copper(II) nitrate is as follows:

    2Cu(NO3)2 –> 2CuO + 4 NO2 + O2

    NO2 is a brown gas.

    O2 relights a glowing splinter.

    CuO is an alkaline oxide.

    Ans: B 1 and 2

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