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Reyana09
@reyana09
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Joined: Nov 16, 2021
Last seen: Dec 29, 2021
Topics: 0 / Replies: 2505
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4 years ago
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4 years ago
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Answer to: IUDs prevent pregnancy by

Correct answer: (d) all of these.

4 years ago
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Answer to: The oxidation number of S in Na2S4O6 is

Correct answer: (b) 2.5 Explanation: Na2S4O6 : 2 + 4x - 12 = 0 ∴ x = = 2.5 Oxidation number of S = 2.5

4 years ago
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Answer to: In the reaction 2FeCl3 + H2S → 2FeCl2 + 2HCl + S

Correct answer: (a) FeCl3 acts as an oxidising agent Explanation: In 2FeCl3 + H2S → 2FeCl2 + 2HCl + S O.N. of S changes from –2 to 0 (hence oxid...

4 years ago
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Answer to: The reaction, 2H2O(l) → 4H^+(aq) + O2(g) + 4e^- is

Correct answer: (d) a hydrolysis reaction Explanation: Since there is loss of electrons, hence it is oxidation reaction.

4 years ago
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Answer to: In which of the following reactions, there is no change in valency?

Correct answer: (c) BaO2 + H2SO4 → BaSO4 + H2O2 Explanation: In BaO2 + H2SO4 → BaSO4 + H2O2 all atoms are present in the same O.S. in reactants an...

4 years ago
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Answer to: The brown ring complex is formulated as [Fe(H2O)5NO]SO4. The oxidation number of iron is

Correct answer: (a) 1 Explanation: [Fe(H2O)5NO]SO4 Let O.N. of Fe be x then, 1× (x) + 5 × (0) + 1× (+1) + 1 × (-2) = 0 ∴ x = +1

4 years ago
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Answer to: The first case of IVF-ET technique success was reported by

Correct answer: (b) Patrick Steptoe and Rebert Edwards

4 years ago
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Answer to: The test-tube baby program employs which one of the following techniques?

Correct answer: (a) Zygote intra Fallopian transfer (ZIFT)

4 years ago
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