Choose the correct statements:-

Pure water changes the colour of blue litmus to red

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Coke reacts with steam to produce water gas

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Water and chlorine reacts to form hydrogen

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Electrolysis of water produces hydrogen and oxygen

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Solution

The correct options are
B
Coke reacts with steam to produce water gas

D
Electrolysis of water produces hydrogen and oxygen

Pure water is neutral to litmus and does not change the color of blue litmus or red litmus solution.

Water and chlorine react to form chlorine water and releases oxygen on exposure to sunlight.

$C l_{2} (g) + 2 H_{2} O (l) s u n l i g h t - ----- \to 2 H C l (a q) + O_{2} (g)$

Coke reacts with the steam to form water gas

$C (s) + H_{2} O (g) \to C O (g) + H_{2} (g)$

Electrolysis of water gives hydrogen and oxygen

$2 H_{2} O (l) e l e c t r i c c u r r e n t - ----------- \to H_{2} (g) + O_{2} (g)$

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Calcium reacts with water to form calcium hydroxide and hydrogen gas.

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