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Among the following identify methods of preparation of bases

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a

by action of an alkali on a salt solution

b

action of acid on the salt of another acid

c

dissolving metal oxides in water

d

action of water or steam on some active metals

answer is A.

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Detailed Solution

$Ex : {MgSO}_{4}_{(Aq)} + 2 NaOH \to Mg {(OH)}_{2} ↓ + {Na}_{2} {SO}_{4 (Aq)}$

${Na}_{2} O + H_{2} O \to 2 NaOH$

$2 Na + H_{2} O \to 2 NaOH$

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Among the following identify methods of preparation of bases