What is the value of x in the following equation? MnO4‾ + 4H+ + xe- → MnO2 + 2H2O
A. 2 B. 3 C. 4 D. 7 E. 8 Correct Answer: Option B – 3
From the following equations, what is the order of decreasing reactivity of X, Y and Z?
Y (s) + X²+(aq) → Y²+(aq) + X(s) X(s) + Z²+(aq) → X²+(aq) + Z(s) A. X>Y>Z B. Y > X > Z C. Z > Y > X D. Y > Z > X E. X > Z > Y Correct Answer: Option B – Y > X > Z
What quantity of electrons (in mole) is lost when one mole of iron (ll) ions is oxidized to iron (lll) ions?
A. 5 mole B. 4 mole C. 3 mole D. 2 mole E. 1 mole Correct Answer: Option E – 1 mole
Which of the following ions will migrate to the cathode during electrolysis?
A. Zinc ions B. Chloride ions C. Sulphide ions D. Tetraoxosulphate (Vl) ions E. Trioxonitrate (V) ions Correct Answer: Option A – Zinc ions
The loss of molecules of water of crystallization to the atmosphere by some crystalline salts is known as?
A. efflorescence B. effervescence C. phosphorescence D. fluorescence E. deliquescent Correct Answer: Option A – efflorescenceProducts
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