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Take about 1 gram of solid NaCl in a cle...

Take about 1 gram of solid NaCl in a clean and dry test tube. Add some con. `H_2SO_4` and test the evolved gas with a  litmus paper. Your observation is

A

`1`. Blue litmus changes Into red

B

`2`. Red litmus changes into blue

C

`3`. No changes in litmus papers

D

`4`. Either A or B

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