A level chemistry exam questions - MCQs

1.	When KBr is dissolved in water, K+ ions are (A) oxidised (B) reduced (C) hydrolysed (D) hydrated	Answer: (D)
2.	When sulphur dioxide is passed in an acidified K2Cr2 O7 solution, the oxidation state of sulphur is changed from (A) + 4 to 0 (B) + 4 to + 2 (C) + 4 to + 6 (D) + 6 to + 4	Answer: (C)
3.	When the azimuthal quantum number has the value of 2, the number of orbitals possible are (A) 7 (B) 5 (C) 3 (D) O	Answer: (B)
4.	Which complex can not ionise in solution? (A) [Pt(NH3)6] Cl4 (B) K2[pt(F6)] (C) K4[Fe(CN)6] (D) [CoCl3(NH3)3]	Answer: (D)
5.	Which is the most easily liquifiable rare gas? (A) Xe (B) Kr (C) Ar (D) Ne	Answer: (A)
6.	Which metal has a greater tendency to form metal oxide? (A) Cr (B) Fe (C) Al (D) Ca	Answer: (D)
7.	Which of the following can be measured by the Ostwald-Walker dynamic method  (A) Relative lowering of vapour pressure (B) Lowering of vapour pressure (C) Vapour pressure of the solvent (D) all of these	Answer: (A)
8.	Which of the following compounds has the lowest melting point? (A) CaF2 (B) CaCl2 (C) CaBr2 (D) CaI2	Answer: (D)
9.	Which of the following electrolytic solutions has the least specific conductance `? (A) 0.02 N (B) 0.2 N (C) 2 N (D) 0.002 N	Answer: (D)
10.	Which of the following elements is present as the impurity to the maximum extent in the pig iron? (A) Phosphorus (B) Manganese (C) Carbon (D) Silicon	Answer: (C)