Redox

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Redox

Test1 Max. Marks = 40

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1. Oxidation state of hydrogen in CaH₂ is -

4 points

(A) +1

(B) –1

(D) 0

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2. A redox reaction is -

4 points

(A) Proton transfer reaction

(B) Electron transfer reaction

(D) A reaction in a solution

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3. The reaction

Co(s) + Cu²⁺(aq) ----------> Co²⁺(aq) + Cu(s) is -

4 points

(A) Oxidation

(B) Reduction

(D) Hydrolysis

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4. Which of the following halogens always shows only one oxidation state-

4 points

(A) Cl

(B) F

(D) I

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5. In the following reaction

4P + 3KOH + 3H₂O -----------> 3KH₂PO₂ + PH₃

4 points

(A) Only phosphorus is oxidized

(B) Only phosphorous is reduced

(D) Phosphorus is neither oxidised nor reduced

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6. Oxygen has the oxidation state of + 2 in-

4 points

(A) SO₂

(B) CO₂

(D) OF₂

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7. When KMnO₄ is titrated against FeSO₄.(NH₄)₂SO₄.6H₂O the equivalent mass of KMnO₄ is

4 points

(A) Molecular mass / 10

(B) Molecular mass / 5

(D) Molecular mass

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8. An example of redox process is –

4 points

(A) CuSO₄ + Fe -----------> FeSO₄ + Cu

(B) Ca(OH)₂ + 2HCl -----------> CaCl₂ + 2H₂O

(D) CaCO₃ -----------> CaO + CO₂

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9. Oxidation number of S in H₂S₂O₇ is –

4 points

(A) +4

(B) –6

(D) +6

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10. The equivalent mass of MnSO₄ is half of its molar mass when it is converted to -

4 points

(A) Mn₂O₃

(B) MnO₂

(D) MnO₄²⁻

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