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Question

Arrange the following hydrides in their increasing acid strength [CH4, H2S, PH3 and SiH4] -

A
H2S< PH3< SiH4< CH4
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B
CH4< SiH4< PH3< H2S
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C
SiH4<CH4<PH3<H2S
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D
CH4< H2S< PH3< SiH4
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Solution

The correct option is B CH4< SiH4< PH3< H2S

As we go left to right in a period, as the non-metallic character increases and the acidic character of hydrides increases.


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