PPSC Chemistry Mcqs Papers


Which element has the highest Iomization Energy:
(a) Sodium (b) Aluminium
(c) Calcium (d) Phosphorus

(2) Given the reaction 2CO(g) + O 2 (g)
2CO2(g) when the reaction is subjected to stress, a change will occur in the concentration of:

(a) reactants only
(b)products only
(c) both reactants and products
(d)neither reactants nor products

(3) Which type of reaction is occurring when a metal undergoes corrosion:
(a) Oxidation-reduction (b) Neutralization
(c) Polymerization (d) Saponification
(e) None of these

(4) What is the pH of 0.00001 Molar HCl solution:
(a) 1 (b)9 (c)5
(d) 4 (e) None of these

(5) What is the total number of atoms contained in 2 moles of nickel?
(a) 58.9 (b) 118 (c) 6.02 ´1023
(d) 1.2 ´1024 (e) None of these

(6) What is the percent by mass of oxygen in magnesium oxide (MgO):
(a) 20 % (b) 40 % (c) 50 %
(d) 60 % (e) None of these


(7) Which halogens are gases at STP?
(a) Chlorine and Bromine (b) Chlorine and Fluorine
(c) Iodine and Fluorine (d) Iodine and Bromine

(8) The internal resistance of a liquid to flow is called:
(a) Surface tension (b) Capillary action
(c) Viscosity (d) Van der waals alteraction
(e) None of these

(9) Two Cu Cu2+ couples, A and B are prepared with Cu2+ concentration of exactly
twice that of B. If these two couples are joined to make a cell:
(a) No current will flow (b) Current will flow from A to B
(c) Current will flow from B to A (d) The system will be in equilibrium

(10) The valence of an element:
(a) Always equals the oxidation number
(b) Never equals the oxidation number
(c) Is unrelated to the oxidation number
(d) May be numerically equal to the oxidation number

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