Chemistry Past Papers | Online Quiz Competition

Online science chemistry quiz test for the MCAT, ECAT, PPSC, CSS, NTS and interviews previous year question paper question answers for the students. Here you will learn online objective type chemistry problems answers with basic inorganic chemistry questions and answers.

Online chemistry questions and answers book for PPSC Dogar Sons question answers with inorganic chemistry multiple choice questions with answers for the students and Science educators jobs interviews.

Solved MCQs Basic Chemistry Answers Quiz Test

MDCAT Chemistry MCQs Online Quiz Test

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Solved MCQs Difficult Chemistry Questions And Answers

Q.1: Water of crystallization can be removed by--------- ?

1. drying
2. heating
3. evaporation
4. All of the above

B

Q.2: Boiling point elevations can be measured by------- ?

1. Beckmanns method
2. Landsbergers method
3. Linds method
4. none of the above

B

Q.3: Which has the minimum freezing point ?

1. One Molal NaCI
2. One molal KCI solution
3. One molal CaCI2
4. One molal urea solution

C

Q.4: 10ml of alcohol dissolve in 90ml of water unit of concentration used is------- ?

1. % w/w
2. % w/v
3. % v/v
4. % v/w

C

Q.5: Hydration is a process in which--------- ?

1. Molecules are surrounded by solvent molecules
2. Ions are surrounded by solvent molecules
3. Both ions and molecules are surrounded by solvent molecules
4. Both ions and molecules are surrounded by water molecules

D

Q.6: In an electrolytic cell current flows ?

1. From cathode to anode in outer circuit
2. From anode to cathode outside the cell
3. From cathode to anode inside the cell
4. both B AND C

B

Q.7: In Galvanic cell electrons flow from anode to cathode ?

1. external electric circuit
2. salt bridge
3. movement of ions
4. all of the above

A

Q.8: The specie which donates electrons to central metal atom in coordination sphere is called--------- ?

1. anion
2. cation
3. Ligand is positively charged
4. acid

C

Q.9: In pig iron the concentration of C-atom is ---------- ?

1. 0.12 — 0.25%
2. 2.5 — 4.5%
3. 2.0 — 4.0%
4. 0.25 — 2.5%

B

Q.10: H2 gas in SHE is filled at pressure of--------- ?

1. 760mm of Hg
2. 750mm of Hg
3. 780mm of Hg
4. 800mm of Hg

A

Q.11: Capacity of one lead accumulator cell is---------- ?

1. 1.5 volts
2. 2 volts
3. 3 volts
4. 1 volts

B

Q.12: In K2Cr2O7 the oxidation number of chromium is-------- ?

1. 7
2. 6
3. -7
4. -6

B

Q.13: The strength of solution of an element whose electrode potential is to be measured is--------- ?

1. 2M
2. 1N
3. 1m
4. 1M

D

Q.14: Which of the following cell is not rechargeable ?

1. Lead storage battery
2. Silver oxide cell
3. Fuel cell
4. Ni-Cd cell

B

Q.15: Reaction at anode is called--------- ?

1. oxidation
2. reduction
3. redox
4. decomposition

A

Q.16: Potential of SHE is considered as---------- ?

1. zero
2. unity
3. constant
4. multiple of 1

A

Q.17: Which of following is not a base------- ?

1. KOH
2. NH3
3. PH3
4. BF3

D

Q.18: When the value of Kc is very small then--------- ?

1. reaction is at start
2. product con
3. Is maximum
4. reactant con
5. Is minimum
6. reaction is completed

B

Q.19: The rate of reaction---------- ?

1. Increases as the reaction proceeds
2. Decreases as the reaction proceeds
3. Remains the same as the reaction proceeds
4. May decrease or increase as the reaction proceeds

B

Q.20: Residence time of methane in the atmosphere is--------- ?

1. 3 – 7 days
2. 2 -3 days
3. 3 – 7 years
4. 2 – 3 years

C