Given below are two statements:
Statement I:  According to Lewis's concept, H2O acts as an amphoteric substance.
Statement II: H2O act as an acid on reaction with NH3, while it acts as a base on reaction with H2S.
In light of the above statements choose the correct answer from the options given below:
1. Both Statement I and Statement II  are correct. 
2. Both Statement I and Statement II  are incorrect.
3. Statement I is correct and Statement II is incorrect.
4. Statement I is incorrect and Statement II is correct.
Subtopic:  Acids & Bases - Definitions & Classification |
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pH of a buffer solution of \(CH_3CH_2COOH(aq.)~\&~CH_3CH_2COONa(aq.) \) is 4.
Then, the ratio of \(\frac{[CH_3CH_2COO^-]}{[CH_3CH_2COOH]}\) is-
(Given \(K_a=10^{-5} \))

1.  0.1
2.  10
3.  0.2
4.  20
Subtopic:  pH calculation |
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The solubility of Ca(OH)2 in water is: 

[Given: Ksp Ca(OH)2 in water = 5.5 × 10–6]

1. 1.77 × 10–6

2. 1.11 × 10–6

3. 1.11 × 10–2

4. 2.77 × 10–2

Subtopic:  Solubility Product |
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The pH of an ammonium phosphate solution, if the pKa of phosphoric acid and the pKb of ammonium
hydroxide are 5.23 and 4.75 respectively, is:

1. 8 2. 6
3. 7 4. 10
Subtopic:  pH calculation |
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Assertion (A): When Cu (II) and sulphide ions are mixed, they react together extremely quickly to give a solid.
Reason (R): The equilibrium constant of Cu2+(aq) +  S2- (aq)   ⇋   CuS(s)   is high because the solubility product is low.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A)
2. Both (A) and (R) are False.
3. (A) is True but (R) is False.
4. Both (A) and (R) are True but (R) is not the correct explanation of (A)
Subtopic:  Solubility Product |
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An acidic buffer is obtained on mixing :
1. 100 mL of 0.1 M CH3COOH and 100 mL of 0.1 M NaOH.
2. 100 mL of 0.1 M HCl and 200 mL of 0.1 M NaCl.
3. 100 mL of 0.1 M HCl and 200 mL of 0.1 M CH3COONa.
4. 100 mL of 0.1 M CH3COOH and 200 mL of 0.1 M NaOH.

Subtopic:  Buffer |
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100 mL of 0.1 M HCl is taken in a beaker and to it 100 mL of 0.1 M NaOH is added in steps of 2 mL and the pH is continuously measured. Which of the following graphs correctly depicts the change in pH?

1. 2.
3. 4.
Subtopic:  Acids & Bases - Definitions & Classification |
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At 1990 K and 1 atm pressure, there are an equal number of Cl2 molecules and Cl atoms in the reaction mixture.
The value of KP for the reaction Cl2(g)2Cl(g) under the above conditions is x × 10–1. The value of x is:

1. 4

2. 8

3. 5

4. 10

Subtopic:  Introduction To Equilibrium |
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If the equilibrium constant for AB+CisKeq(1) and that of B+ CPisKeq(2), the equilibrium constant for AP is: 

1. Keq(2)-Keq(1)

2. Keq(1) ×Keq(2)

3. Keq(1)+Keq(2)

4. Keq(2)/Keq(1)

Subtopic:  Kp, Kc & Factors Affecting them |
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For the reaction A(g)(B)(g), the value of the equilibrium constant at 300 K and 1 atm is equal to 100.0. The value of rG for the reaction at 300 K and 1 atm in J mol–1 is – xR, where x is:
(R = 8.31 J mol–1 K–1 and ln 10 = 2.3)

1. 1400

2. 1380

3. 1360

4. 1340

Subtopic:  Introduction To Equilibrium |
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