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A gas 'X' reacts with another gas 'Y' in...

A gas 'X' reacts with another gas 'Y' in the presence of a catalyst to give a colourless gas 'Z'. The gas 'Z' when comes in contact with air produces a brown gas 'D'. The solution of 'X' in water turns red litmus blue. Explain the observations. 

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GasX is ammonia, gas Y is oxygen , gas Z is nitric oxide and gas D is nitrogen dioxide
`underset("Ammonia (X)")(4NH_3(g)) + underset("Oxygen (Y)")(5O_2(g)) overset("Platinum")(rarr)underset("water")(6H_2O(v)) + underset("Nitric oxide")(4NO_(g))`
`underset("Z)(2NO(g)) + O_(2)(g) to underset(D)(2NO_2(g))`
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