Reaction R1 - Quick lime reacts with water to produce slaked lime.

Reaction R2 - Slaked lime reacts with carbon dioxide to produce limestone.

Which of the following is true in respect of R1 & R2 ? 

1
R1 - Combination reaction, R2 - Combination reaction 
2
R1 - Displacement reaction, R2 - Combination reaction 
3
R1 - Decomposition reaction, R2 - Combination reaction 
4
R1 - Combination reaction, R2 - Displacement reaction 

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