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Why a mixture of hy-drazine and H(2)O(2)...

Why a mixture of hy-drazine and `H_(2)O_(2)` is used as a rocket propellant?

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The reaction is highly exothermice. It bring large increase in volume also .
`N_(2)H_(4) +2H_(2)O to N_(2)(g) + 4H_(2)O(g)`
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A mixture of hydrazine and H_(2)O_(2) is:

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