CHEMISTRY
UPSC Chemistry MCQs
CHEMISTRY MCQs
1. Which one of the following pairs represents stereoisomerism ?
1) Chain isomerism and rotational isomerism
2) Structural isomerism and geometric isomerism
3) Linkage isomerism and geometric isomerism
4) Optical isomerism and geomertric isomerism
Ans: D
2. The correct order in which the O — O bond length increases in the following is :
1) H2O2 < O2 < O3
2) O3 < H2O2 < O2
3) O2 < O3 < H2O2
4) O2 < H2O2 < O3
Ans: C
3. The mass of carbon anode consumed (giving only carbondioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is : (Atomic mass Al = 27)
1) 180 kg
2) 120 kg
3) 360 kg
4) 90 kg
Ans: D
4. The cell membranes are mainly composed of :
1) carbohydrates
2) proteins
3) phospholipids
4) fats
Ans: C
5. The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is :
1) one fifth
2) five
3) one
4) two
Ans: D
6. Which of the following molecules has trigonal planar geometry ?
1) IF 3
2) PCl3
3) NH3
4) BF 3
Ans: D
7. The aqueous solution containing which one of the following ions will be colourless ? (Atomic no. : Sc = 21, Fe = 26, Ti = 22, Mn = 25)
1) Sc3+
2) Fe2+
3) Ti3+
4) Mn2+
Ans: A
8. Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy ?
1) Vanadium (Z = 23)
2) Chromium (Z = 24)
3) Iron (Z = 26)
4) Manganese (Z = 25)
Ans: D
9. A reaction occurs spontaneously if :
1) T∆S < ∆H and both ∆H and ∆S are +ve
2) T∆S > ∆H and both ∆H and ∆S are +ve
3) T∆S = ∆H and both ∆H and ∆S are +ve
4) T∆S > ∆H and ∆H is + ve and ∆S is -ve
Ans: B
10. The correct sequence of increasing covalent character is represented by :
1) LiCl < NaCl < BeCl2
2) BeCl2 < NaCl < LiCl
3) NaCl < LiCl < BeCl2
4) BeCl2 < LiCl < NaCl
Ans: C
11. An example of a fumigant is
A) DDT
B) Malathion
C) Methoxychlor
D) p-dichlorobenzene
Ans: D
12. Which metal is sufficiently concentrated in the oceans to be extracted commercially ?
A) Ca
B) Cu
C) Fe
D) Mg
Ans: D
13. Bordeaux mixture contains
A) copper sulphate, hydrated lime and water
B) copper sulphate, sodalime and water
C) cobalt sulphate, urea and water
D) copper arsenate, urea and ammonia
Ans: A
1) Chain isomerism and rotational isomerism
2) Structural isomerism and geometric isomerism
3) Linkage isomerism and geometric isomerism
4) Optical isomerism and geomertric isomerism
Ans: D
2. The correct order in which the O — O bond length increases in the following is :
1) H2O2 < O2 < O3
2) O3 < H2O2 < O2
3) O2 < O3 < H2O2
4) O2 < H2O2 < O3
Ans: C
3. The mass of carbon anode consumed (giving only carbondioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is : (Atomic mass Al = 27)
1) 180 kg
2) 120 kg
3) 360 kg
4) 90 kg
Ans: D
4. The cell membranes are mainly composed of :
1) carbohydrates
2) proteins
3) phospholipids
4) fats
Ans: C
5. The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is :
1) one fifth
2) five
3) one
4) two
Ans: D
6. Which of the following molecules has trigonal planar geometry ?
1) IF 3
2) PCl3
3) NH3
4) BF 3
Ans: D
7. The aqueous solution containing which one of the following ions will be colourless ? (Atomic no. : Sc = 21, Fe = 26, Ti = 22, Mn = 25)
1) Sc3+
2) Fe2+
3) Ti3+
4) Mn2+
Ans: A
8. Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy ?
1) Vanadium (Z = 23)
2) Chromium (Z = 24)
3) Iron (Z = 26)
4) Manganese (Z = 25)
Ans: D
9. A reaction occurs spontaneously if :
1) T∆S < ∆H and both ∆H and ∆S are +ve
2) T∆S > ∆H and both ∆H and ∆S are +ve
3) T∆S = ∆H and both ∆H and ∆S are +ve
4) T∆S > ∆H and ∆H is + ve and ∆S is -ve
Ans: B
10. The correct sequence of increasing covalent character is represented by :
1) LiCl < NaCl < BeCl2
2) BeCl2 < NaCl < LiCl
3) NaCl < LiCl < BeCl2
4) BeCl2 < LiCl < NaCl
Ans: C
11. An example of a fumigant is
A) DDT
B) Malathion
C) Methoxychlor
D) p-dichlorobenzene
Ans: D
12. Which metal is sufficiently concentrated in the oceans to be extracted commercially ?
A) Ca
B) Cu
C) Fe
D) Mg
Ans: D
13. Bordeaux mixture contains
A) copper sulphate, hydrated lime and water
B) copper sulphate, sodalime and water
C) cobalt sulphate, urea and water
D) copper arsenate, urea and ammonia
Ans: A