General Science MCQ – 153 (Chemistry)

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1. Number of moles of K₂Cr₂O₇ reduced by 1 mole of Sn²⁺ is?
(A) 1/6
(B) 1/3
(C) 2/3
(D) 1

2. The oxidation number of carbon in CH₂Cl₂ is?
(A) 0
(B) 2
(C) 3
(D) 5

3. Which of the following will not be oxidized by O₃?
(A) Kl
(B) FeSO₄
(C) KMnO₄
(D) K₂MnO₄

4. The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is?
(A) +4
(B) +6
(C) +2
(D) +3

5. What products are expected from the disproportion reaction of hypochlorous acid?
(A) HCl and Cl₂O
(B) HCl and HClO₃
(C) HClO₃ and Cl₂O
(D) HClO₂ and HCl₄

6. Which of the following elements does not show disproportionation tendency?
(A) Cl
(B) Br
(C) F
(D) I

7. What is the oxidation number of chlorine in HClO4?
(A) +3
(B) +5
(C) +7
(D) +8

8. The oxidation state of each Cl in CaOCl₂ is?
(A) 0
(B) +1
(C) -1
(D) +1, -1

9. The products formed when an aqueous solution of NaBr is electrolyzed in a cell having inert electrodes are?
(A) Na and Br₂
(B) Na and O₂
(C) H₂, Br₂, NaOH
(D) H₂ and O₂

10. Number of moles of MnO₄^– required to oxidize one mole of ferrous oxalate completely in the acidic medium will be?
(A) 7.5 moles
(B) 0.2 moles
(C) 0.6 moles
(D) 0.4 moles

General Science MCQ – 152 (Biology)