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Question

Assertion: Water makes a good buffer.
Reason: A good buffer will resist changes in $$\displaystyle pH$$.


A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

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B

Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

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C

Assertion is true but Reason is false

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D

Assertion is false but Reason is true
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E

Both Assertion and Reason are false

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Solution

The correct option is D

Assertion is false but Reason is true
A buffer solution can be defined as a solution which resists a change in its pH when such a change is caused by the addition of a small amount of acid or base.
Buffer solutions can be obtained:
1:  by mixing a weak acid with its salt with a strong base, eg; Acetic Acid + Soidum Acetate,  Boric acid + Borax, Phthalic acid + Potassium acid phthalate.
2: by mixing a weak base with its salt with a strong acid,  e.g; (a)  $$NH_4OH + NH_4Cl$$ , (b)  Glycine + Glycine hydrochloride.
3:  by a solution of ampholyte. The ampholytes or amphoteric electrolytes are the substances which show properties of  both an acid and a base. Proteins and amino acids are the examples of such electrolytes.
4:  by a mixture of an acid salt and a normal salt of a polybasic acid, e.g., $$Na_2HPO_4 + Na_3PO_4$$, or a salt of weak acid and a weak base, such as $$CH_3COONH_4$$.

Chemistry

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