The oxidation states of Mn in MnSO₄,MnO₂,K₂MnO₄ and KMnO₄ are respectively
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(a) 1,2,4,4 (b) 2,4,6,7 (c) 1,2,4,6 (d) 2,4,7,6
Correct Answer:
2,4,6,7
Explanation:
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A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated.During the reaction which element undergoes maximum change in the oxidation number
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(a) S (b) H (c) Cl (d) C
Correct […]
When Cl₂ gas reacts with hot and concentration sodium hydroxide solution,the oxidation number of chlorine changes from
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(a) zero to +1 and zero to -5 (b) zero to -1 and zero to […]
Oxidation numbers of P in PO₄³⁻, of S in SO₄²⁻ and that of Cr in Cr₂O₇²⁻ are respectively
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(a) 3,6 and 5 (b) 5,3 and 6 (c) -3, 6 and 6 (d) […]
In a buffer solution containing equal concentration of B⁻ and HB, the Kb for B⁻ is 10⁻¹⁰.The pH of buffer solution is
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(a) 10 (b) 7 (c) 6 (d) 4
Correct Answer:
4
If pH of a saturated solution of Ba(OH)₂ is 12, the value of its Ksp is
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(a) 4.00 ˣ 10⁻⁶ M³ (b) 4.00 ˣ 10⁻⁷ M³ (c) 5.00 ˣ 10⁻⁶ M³ (d) […]
At 25⁰C, the dissociation constant of a base, BOH, is 1.0 ˣ 10⁻¹². The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be
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(a) 1.0 ˣ 10⁻⁵ […]
The rapid change of pH near the stoichiometric point of an acid-base titration is the basis of indicator detection.pH of the solution is related to ratio of the concentrations of the conjugate acid (HIn) and […]
The solubility product of a sparingly soluble salt AX₂ is 3.2 ˣ 10⁻¹¹.Its solubility (in mol/L)is
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(a) 5.6 ˣ 10⁻⁶ (b) 3.1 ˣ 10⁻⁴ (c) 2 ˣ 10⁻⁴ (d) 4 ˣ 10⁻⁴
The solubility product of AgI at 25⁰C is 1.0 ˣ 10⁻¹⁶ mol² L⁻². The solubility of AgI in 10⁻⁴ N solution of KI at 25⁰C is approximately (in mol L⁻¹)
Options
(a) 1.0 […]
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