Q.

Consider the following thermal decomposition reactionsx→ Δelement having highest % in airy→ Δelement having highest % in earth crustThen compounds, x and y are respectively.

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a

NH42Cr2O7  ,K2Cr2O7

b

NH42CO3,K2CO3

c

NH4MnO4, KMnO4

d

NH43PO4, K3PO4

answer is A.

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Detailed Solution

In general ammonium compounds contain oxidising anion on decomposition produce nitrogen as one of the product.
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Consider the following thermal decomposition reactionsx→ Δelement having highest % in airy→ Δelement having highest % in earth crustThen compounds, x and y are respectively.