What effect does dihydrogen gas $(H_2)$ have on litmus paper?

  • A
    It turns blue litmus paper red.
  • B
    It turns red litmus paper blue.
  • C
    It has no effect on red or blue litmus paper.
  • D
    It turns red litmus paper blue and blue litmus paper red.

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$(a)$ What is a universal indicator?
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$(a)$ Calcium carbonate reacts with hydrochloric acid.
$(b)$ Calcium oxychloride reacts with hydrochloric acid.
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Write the balanced chemical equations for the following reactions:
$(a)$ Chlorine is passed over dry slaked lime.
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$(a)$ What will you observe when dilute hydrochloric acid is added to a small amount of copper oxide in a beaker?
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Which of the following substances will not give carbon dioxide on treatment with dilute acid?

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