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2. Which one of the following is not a combination reaction
a. Ca(OH)2+ CO2-------->CaCO3 + H2O
b. NH3+ H20---->NH,OH
c. 2H2+ 02 -> 2H2O
d. 2NH2+ H2SO.----->(NH4)2SO4
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Your answer is (A) Ca(OH)₂ (aq) + CO₂ (g) → CaCO₃ + H₂O.
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