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A mixture of salts (Na(2)SO(3)+K(2)Cr(2)...

A mixture of salts `(Na_(2)SO_(3)+K_(2)Cr_(2)O_(7))` in a test tube is treated with dil. `H_(2)SO_(4)` and resulting gas is passed through lime-water. Which of the following observations is correct about this test

A

Solution in test tube becomes green and lime-water turns milky

B

Solution in test tube is colourless and lime-water turns milky

C

Solution in test tube becomes green and lime-water remains clea

D

Solution in test tube remains clear and lime-water also remains clear

Text Solution

Verified by Experts

The correct Answer is:
A
`Na_(2)SO_(3)` with dil.`H_(2)SO_(4)` produces `SO_(2)` gas which turns `K_(2)Cr_(2)O_(7)` and lime water into green and milky , respectively.
`Na_(2)SO_(3) + H_(2)SO_(4) to Na_(20SO_(4) + H_(2)O + SO_(2) duarr`
`K_(2)Cr_(2)O_(7) + H_(2)SO_(4) + SO_(2) to K_(2)SO_(4) + Cr_(2) underset("green")((SO_(4))_(3)) + H_(2)O`
`Ca(OH)_(2) + SO_(2) to underset("Milky")(CaSO_(3)) + H_(2)O`
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