Chemistry MCQ entrance questions

1.	Identify the ore not containing iron (A) chalcopyrites (B) carnallite (C) siderite (D) limonite	Answer: (B)
2.	Identify the reaction that does not take place in a blast furnace. (A) CaCO3 ¾® CaO + CO2 (B) CaO + Si O2 ¾® Ca Si O2 ¾® Ca Si O3 (C) 2Fe2O3 + 3C ¾® 4Fe + 3CO2 (D) CO2 + C ¾® 2CO	Answer: (C)
3.	If n = 6, the correct sequence of filling of electrons will be (A) ns ® np(n - 1)d ® (n - 2)f (B) ns ® n(n - 2)f ® (n - 1)d ® np (C) ns ® (n - 1)d ® (n - 2)f ® np (D) ns ® (n - 2)f ® np ® (n - 1)d	Answer: (B)
4.	If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then (A) DH > Du (B) DH = Du (C) DH < Du (D) there is no relationship	Answer: (C)
5.	If the  for a given reaction has a negative value, then which of the following gives the correct relationships for the values of DG° and Keq? (A) DGo > 0; Keq < 1 (B) DGo > 0; Keq > 1 (C) DGo < 0; Keq > 1 (D) DGo < 0; Keq < 1	Answer: (A)
6.	If the enthalpy change for the transition of liquid water to steam is 30 kJ mol–1 at 27°C, the entropy change for the process would be (A) 100 J mol–1 K–1 (B) 10 J mol–1 K–1 (C) 1.0 J mol–1 K–1 (D) 0.1 J mol–1 K–1	Answer: (A)
7.	If x is amount of adsorbate and m is amount of adsorbent, which of the following relations is not related to adsorption process? (A) = P ´ T (B)  =f(p) at constant T (C)  = f(T) at constant p (D) p = f(T) at constant	Answer: (A)
8.	In acetylene molecule, between the carbon atoms there are (A) three sigma bonds (B) two sigma and one pi bonds (C) one sigma and two pi bonds (D) three pi bonds	Answer: (C)
9.	In alkaline medium, alanine exists predominantly as/in ______. (A) zwitterion (B) anion (C) covalent form (D) cation	Answer: (B)
10.	In chromite ore, the oxidation number of iron and chromium are respectively ______. (A) +3, +6 (B) +3, +2 (C) +2, +3 (D) +2, +6	Answer: (C)