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Q. No.
In the following reaction, HCl formed is titrated with 0.2 moles of NaOH.
Calculate the mass of \(\mathrm{C}_2 \mathrm{H}_5\mathrm{NH}_2\) taken initially:
\(\mathrm{C}_2 \mathrm{H}_5\mathrm{NH}_2+\mathrm{NaNO}_2 \xrightarrow{\mathrm{HCl}} \mathrm{A} \xrightarrow{\mathrm{H}_2 \mathrm{O}} \mathrm{HCl}+\text { Alcohol }+\mathrm{N}_2\)
1. 4
2. 6 
3. 9 
4. 8
Subtopic:  Salt Hydrolysis & Titration |
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Level 2: 60%+
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What is the \(\text{pH}\) of \(\mathrm{CH}_3 \mathrm{COO}^{-} \mathrm{NH}_4^{+}\) salt?
Given: \(\mathrm{K}_{\mathrm{a}} \text { of } \mathrm{CH}_3 \mathrm{COOH}=1.8 \times 10^{-6}\)
           \(\mathrm{K}_{\mathrm{b}} \text { of } \mathrm{NH}_4 \mathrm{OH}=1.8 \times 10^{-6}\)
 
1. \(7\)
2. \(9\)
3. \(8.9\)
4. \(7.8\)
Subtopic:  Salt Hydrolysis & Titration |
 91%
Level 1: 80%+
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Given below are two statements: 
Assertion (A): Phenolphthalein is a pH dependent indicator, remains colourless in acidic solution and gives pink colour in basic medium.
Reason (R): Phenolphthalein is a weak acid. It doesn’t dissociate in basic medium.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic:  Salt Hydrolysis & Titration |
 70%
Level 2: 60%+
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The plot of pH-metric titration of weak base \(\mathrm{NH_4OH}\) vs strong acid \(\mathrm{HCl}\) looks like:
 
1. 2.
3. 4.
Subtopic:  Salt Hydrolysis & Titration |
 51%
Level 3: 35%-60%
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\(200 ~mL\) of \(0.2~ M~ {HCl}\) is mixed with \(300 mL \) of \(0.1 ~M ~NaOH\). The molar heat of neutralization of this reaction is \(–57.1~ kJ\). If the increase in temperature of the system on mixing is \(x\times 10^{-2}\). Find the value of \(x\) :
[Given: Specific heat of water \(=4.18~J~g^{-1}K^{-1}\) ; Density of water \(=1.00~\text{g cm}^{-3}]\)
(Assume no volume change on mixing)

1. 84
2. 82
3. 90
4. 92
Subtopic:  Salt Hydrolysis & Titration |
 75%
Level 2: 60%+
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Find the value of x (nearest integer) if 10 mL of an aqueous Fe²⁺ solution requires 15 mL of 0.02 M K₂Cr₂O₇ solution for complete titration in the presence of dilute H₂SO₄ using diphenylamine indicator.
The molarity of the Fe²⁺ solution is x × 10⁻² M.
1. 18
2. 34
3. 12
4. 43
Subtopic:  Salt Hydrolysis & Titration |
 65%
Level 2: 60%+
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3 g of acetic acid is added to 250 mL of 0.1 M HCl and the solution made up to 500 mL. To 20 mL of this solution 0.5 mL of 5 M NaOH is added. The pH of the solution is :

[Given : pka of acetic acid =4.75, molar mass of acetic acid \(=60 \mathrm{~g} / \mathrm{mol}, \log 3=0.4771 \)]

1. 2.63
2. 5.23
3. 7.08
4. 9.30
Subtopic:  Salt Hydrolysis & Titration |
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Level 2: 60%+
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Find the pH of a 0.005 M solution of calcium acetate, Ca(CH₃COO)₂.
Given: pKa of CH₃COOH = 4.74

1. 7.04  2. 9.37 
3. 9.26  4. 8.37
Subtopic:  Salt Hydrolysis & Titration |
Level 3: 35%-60%
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