A. Cu
B. Ag
C. Pt
D. None
✅ The correct answer is option C.
Chemistry
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272. Which of the following will not form the crystalline structure with oppositely charged ions
A. H+
B. H-
C. Mg2+
D. Ca2+
✅ The correct answer is option A.
273. If electricity is passed through a CuSO4 solution by using a Pt electrode then which of the following possible change occurs?
A. H2 is deposited at the cathode
B. Colour of the solution becomes fade
C. Cu is deposited at an anode
D. All are possible
✅ The correct answer is option B.
274. Which statement is incorrect?
A. All the metals are the good conductor of electricity
B. All the metals are the good conductor of heat
C. All the metals form positive ions
D. All the metals from acidic oxides
✅ The correct answer is option D.
275. Stronger the oxidizing agent greater is the
A. Oxidation potential
B. Reduction potential
C. Redox potential
D. Emf of the cell
✅ The correct answer is option B.
276. Periodic table provides a basic framework to study elements with respect to their
A. Physical properties
B. Chemical properties
C. Properties of their compounds
D. All
✅ The correct answer is option D.
277. Which has a maximum oxidation number?
A. N
B. Cr
C. S
D. Mn
✅ The correct answer is option D.
278. The scientist who did not contribute to the construction of the periodic table?
A. Al-Razi
B. Moseley
C. Dobereiner
D. Democritu
✅ The correct answer is option D.
279. Which of the following cell is not rechargeable?
A. Lead storage battery
B. Silver oxide cell
C. Fuel cell
D. Ni-Cd cell
✅ The correct answer is option B.
280. Which of the following substance produce acetaldehyde on dry distillation?
A. (CH3COO)2Ca
B. (HCOO)2Ca
C. Both A and B
D. None
✅ The correct answer is option C.