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Which of these substances cannot be used to neutralise an acid.

calcuim oxide
potassium hydroxide
magnesium carbonate
sodium chloride


Magnesium carbonate cannot neutralize an acid.
1)strong acid+strong base>>>>>>>>salt +water

2)strong acid+weak base>>>>>>>>salt+water

3)weak acid +strong base>>>>>>>>>>salt+water

4)weak acid +weak base>>>>>>>>>>>salt +water
reaction 4) is not commonly used for neutralization reactions and magnesium carbonate is 4th reaction.
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