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MCQs With Answers Objective Type MCQs With Answers

Q.1: In electrolytic solution conductance of electricity is due to -------- ?

1. free electrons
2. ions
3. metals
4. electrodes

B

Q.2: Right half cell contains ------------- electrode ?

1. A1
2. Zn
3. Cu
4. Fe

C

Q.3: E0red of an element cab be calculated by comparing it with --------- ?

1. New electrode of same element
2. SHE
3. 1M solution of ions of respective element
4. 2M solution of HCI

B

Q.4: The element that act as anode always have -------------- position in electrochemical cell ?

1. higher
2. lower
3. in middle
4. no effect of position

A

Q.5: Mostly elements have fractional atomic masses because of---------- ?

1. mass of an atom itself is in fraction
2. atomic masses are average masses of isobars
3. atmoic masses are average masses of isotopes proportional to their relative abundance
4. atmoic masses are average masses of isotopes

D

Q.6: When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether ?

1. 0.5
2. 1
3. 1.5
4. 2

D

Q.7: Which alkyl halide out of the following may follow both SN1 and SN2 mechanism ?

1. CH3-X
2. (CH3)3 C-CH2 – X
3. (CH3)2 CH – X
4. (CH3)3 C – X

C

Q.8: Oxygen (molecular weight = 32) diffuses at a rate of 10cm3/min under the same conditions of temperature and pressure how fast will hydrogen (molecular weight = 2) diffuse ?

1. 20cm3/min
2. 40cm3/min
3. 160cm3/min
4. 2.5cm3/min

B

Q.9: Which statement is consistent with Hunds rule ?

1. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin.
2. The electrons in the same atom cannot have the same four quantum numbers
3. There is maximum of two electrons is an orbital.
4. None

B

Q.10: Quantum number values for 3p orbitals are-------- ?

1. n=3 l=2
2. n=3 l=0
3. n=3 l=1
4. n=3 l=3

C

Q.11: Atomic number of Mn is 25 what is the electronic configuration in the ground state--------- ?

1. 1s2 2s2 2p6 3s2 3p6 3d7
2. 1s2 2s2 2p6 3s2 3p6 4s2 4p5
3. 1s2 2s2 2p6 3s2 3p5 3d10
4. 1s2 2s2 2p6 3s2 3p6 4s23d5

D

Q.12: For a given process the heat changes at constant pressure (qp) and at constant volume (qv) are related to each other as-------- ?

1. qp = qv
2. qp < qv
3. qp > qv
4. qp = qv / 2

C

Q.13: Which of the following is not characteristics of reversible reaction--------- ?

1. whole amount of reactant does not change into product
2. chemical equilibrium is established
3. a catalyst changes the direction of reaction
4. rate of forward reaction decreases as reaction proceeds

C

Q.14: A solution has pH = 0 its H+ ion concentration is-------- ?

1. 1 x 10-1
2. 1 x 10-14
3. 1 x 10-7
4. 1

D

Q.15: Elimination bimolecular reactions involve---------- ?

1. first order kinetics
2. second order kinetics
3. third order kinetics
4. zero order kinetics

B

Q.16: Which is the unit of (K) rate constant for zero order reaction ?

1. s-1
2. mol dm-3 s-1
3. mol-1 dm3 s-1
4. mol-2 dm6 s-1

B

Q.17: If a graph is plotted between temperature on x-axis and volume on y-axis for 1 mole of gas then we get straight line which cuts the temperature exis at----- ?

1. 0C
2. 273.16K
3. ?273.16 K
4. ?273.16?C

D

Q.18: The unit of molality is--------- ?

1. moles dm-3
2. moles kg-1
3. gram dm-3
4. none

B

Q.19: Fruit juices and fizzy drinks such as lemonade are often sold in aluminium cans. What is the most important reason aluminium is a suitable metal ?

1. aluminium can be recycled
2. aluminium has very low density
3. aluminium is the most abundant metal in the earth crust
4. aluminium is resistant to corrosion by organic acids.

D

Q.20: Solubility of CaF2 is 2.0×10-4 gdm-3 then Ksp of CaF2 is------- ?

1. 4.0 x 10-8
2. 3.2 x 10-11
3. 2.0 x 10-8
4. 4.0 x 10-12

B