Q4 of 26 Page 1

On heating Cu turnings with conc. HNO3, a brown colored gas is evolved which on cooling dimerises. Identify the gas.

On heating Cu turnings with conc. HNO3, NO2 is evolved.


Cu + conc. 4HNO3 Cu(NO3)2 + 2NO2 + 2H2O


NO2 is an odd electron molecule hence, it dimerises to attain stability. 2NO2 ⇋ N2O4


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When a co-ordination compound CoCl3⋅4NH3 is mixed with AgNO3, 1 mole of AgCl is precipitated per mole of the compound. Write

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