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When conc. H2 SO4 was added to an unknow...

When conc. `H_2 SO_4` was added to an unknown salt, a brown gas 'A' was evolved, On cooling this gas 'A' changed to a colour less gas 'B'. The 'A' and 'B' are:

A

`NO_2 , N_2 O_4`

B

`NO_2 , NO`

C

`NO, N_2 O_5`

D

`NO, N_2 O_3`

Text Solution

Verified by Experts

The correct Answer is:
A
`MNO_3 + H_2 SO_4 to MHSO_4 + HNO_3` metal nitrate
`4HNO_3 to underset(.A.)(4NO_2) + 2H_2 O`
`underset(.A.)(2NO_2) overset("cool")hArr underset(.B.)(N_2 O_4(g))`
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