Which of the following is a combination reaction?

2 H C l (g) L i g h t - -- \to H_{2} (g) + C l_{2} (g)

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M g O + H_{2} O \to M g (O H)_{2}

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Z n + F e S O_{4} \to Z n S O_{4} + F e

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H C l + N a O H \to N a C l + H_{2} O

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Solution

The correct option is B $M g O + H_{2} O \to M g (O H)_{2}$
It is a combination reaction when magnesium oxide reacts with water to form a new product magnesium hydroxide.

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