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Which of the statements are correct?

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a
Be2C+H2O→ Marsh gas
b
Al4C3+H2O→ Gas is a content of CNG
c
CaC2+H2O→ Gas is used for welding purpose with O2 gas
d
Ca3P2+H2O→ Gas is used in Holme signals with CaC2

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detailed solution

Correct option is

1. Gives CH4(g), which is also called Marsh gas   2. It also gives CH4(g), which is a constituent of CNG.   3. It gives acetylene (HC≡CH) gas with O2 used for welding.   4. It gives phosphine PH3 ) gas used in Holme's signal.

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