Multiple Choice Question Answer XXXXIX — task. Science CBSE, Class 10.

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1. The type of reaction that gives an upward thrust to space rockets is -

Endothermic reaction
Double displacement
Decomposition reaction
Combination reaction

2. The basis of black and white photography is -

Decomposition of silver salts
Decomposition of lead salts
Combination of lead salts
Combination of silver salts

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