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Q.

Active metals react with dilute sulphuric acid to liberate  X. Active metals react with concentrated sulphuric acid to liberate Y.     X , Y  are respectively

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a

SO2 , H2

b

H2 , SO2

c

SO2 , SO2

d

H2 , H2

answer is A.

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Detailed Solution

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Active metals have negative SRP values

Active metals reduce

I- H+ to H2 with dil.H2SO4; II- SO4-2 to SO2 with conc.H2SO4; .

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