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On the basis of the equation \[\ce{pH}\] = – log \[\ce{[H+]}\], the \[\ce{pH}\] of 10–8 mol dm–3 solution of \[\ce{HCl}\] should be 8. However, it is observed to be less than 7.0. Explain the reason.
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Assertion (A): A solution containing a mixture of acetic acid and sodium acetate maintains a constant value of \[\ce{pH}\] on addition of small amounts of acid or alkali.
Reason (R): A solution containing a mixture of acetic acid and sodium acetate acts as a buffer solution around \[\ce{pH}\] 4.75.
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Assertion (A): An aqueous solution of ammonium acetate can act as a buffer.
Reason (R): Acetic acid is a weak acid and \[\ce{NH4OH}\] is a weak base.
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The solubility product constant of Ag2CrO4 and AgBr are 1.1 × 10–12 and 5.0 × 10–13respectively. Calculate the ratio of the molarities of their saturated solutions.
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Equal volumes of 0.002 M solutions of sodium iodate and cupric chlorate are mixed together. Will it lead to precipitation of copper iodate? (For cupric iodate Ksp = 7.4 × 10–8).
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A sparingly soluble salt gets precipitated only when the product of concentration of its ions in the solution (Qsp) becomes greater than its solubility product. If the solubility of \[\ce{BaSO4}\] in water is 8 × 10–4 mol dm–3. Calculate its solubility in 0.01 mol dm–3 of \[\ce{H2SO4}\].
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The solubility product of \[\ce{Al(OH)3}\] is 2.7 × 10–11. Calculate its solubility in gL–1 and also find out pH of this solution. (Atomic mass of \[\ce{Al = 27 u}\]).
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A sparingly soluble salt having general formula \[\ce{A^{p+}_x B^{q-}_y}\] and molar solubility S is in equilibrium with its saturated solution. Derive a relationship between the solubility and solubility product for such salt.
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Notice this expression in the text. Infer their meaning from the context.
the thought was almost revolting
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Mention the three phases of the author’s relationship with his grandmother before he left the country to study abroad.
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Mention three reasons why the author’s grandmother was disturbed when he started going to the city school.
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Mention three ways in which the author’s grandmother spent her days after he grew up.
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Mention the odd way in which the author’s grandmother behaved just before she died.
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Mention the way in which the sparrows expressed their sorrow when the author’s grandmother died.
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Talk to your partner about the following.
The author’s grandmother was a religious person. What are the different ways in which we come to know this?
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Talk to your partner about the following.
Describe the changing relationship between the author and his grandmother. Did their feelings for each other change?
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Talk to your partner about the following.
Would you agree that the author’s grandmother was a person strong in character? If yes, give instances that show this.
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Talk to your partner about the following.
Have you known someone like the author’s grandmother? Do you feel the same sense of loss with regard to someone whom you have loved and lost?
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Which language do you think the author and his grandmother used while talking to each other?
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Which language do you use to talk to elderly relatives in your family?
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