MCQ Questions for Class 12 Chemistry Chapter 2 Solutions Part-1 with Answers

Solutions Part-1 Class 12 Chemistry MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 2 Solutions Part-1 with Answers Pdf free download. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. We have Provided Solutions Part-1 Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well.

Class 12 Chemistry Chapter 2 Quiz

Class 12 Chemistry Chapter 2 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Chemistry Chapter 2 Solutions Part-1 to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Solutions Part-1 Class 12 Chemistry MCQ online test

Q1.	If 2 gm of NaOH is present is 200 ml of its solution, its molarity will be
	A.0.25
	B.0.5
	C.5
	D.10

Ans: 0.25

Q2.	The atmospheric pollution is generally measured in the units of
	A.mass percentage
	B.volume percentage
	C.volume fraction
	D.ppm

Ans: ppm

Q3.	A 5% solution of cane-sugar (molecular weight = 342) is isotonic with 1% solution of substance A. The molecular weight of X is
	A.342
	B.171.2
	C.68.4
	D.136.8

Ans: 68.4

Q4.	234.2 gm of sugar syrup contains 34.2 gm of sugar. What is the molal concentration of the solution.
	A.0.1
	B.0.5
	C.5.5
	D.55

Ans: 0.5

Q5.	H₂S is a toxic gas used in qualitative analysis. If solubility of H₂S in water at STP is 0.195 m. what is the value of K_H?
	A.0.0263 bar
	B.69.16 bar
	C.192 bar
	D.282 bar

Ans: 282 bar

Q6.	Atomic mass is equal to
	A.number of electrons of an atom
	B.sum of the numbers of electrons and protons of an atom
	C.sum of the numbers of neutrons and protons of an atom
	D.none of these

Ans: sum of the numbers of electrons and protons of an atom

Q7.	Henry’s law constant for molality of methane is benzene at 298 K is 4.27 × 10⁵ mm Hg. The mole fraction of methane is nenzene at 298 K under 760 mm Hg is
	A.1.78 × 10^-3
	B.17.43
	C.0.114
	D.2.814

Ans: 1.78 × 10^-3

Q8.	How much oxygen is dissolved in 100 rnL water at 298 K if partial pressure of oxygen is 0.5 atm and K = 1.4 × 10^-3 mol/L/atm?
	A.22.4 mg
	B.22.4 g
	C.2.24 g
	D.2.24 mg

Ans: 2.24 mg

Q9.	The law which indicates the relation’-hip between solubility of a gas in liquid and pressure rs
	A.Raoult’s law
	B.Henry’s law
	C.Lowering of vapour pressure
	D.Van’t Hoff law

Ans: Henry’s law

Q10.	Among the following substances the lowest vapour pressure is exerted by
	A.water
	B.alcohol
	C.ether
	D.mercury

Ans: mercury

Q11.	Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 gof Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y?
	A.20
	B.50
	C.100
	D.200

Ans: 50

Q12.	Partial pressure of a solution component is directly proportional to its mole fraction. This is known as
	A.Henry’s law
	B.Raoult’s law
	C.Distribution law
	D.Ostawald’s dilution law

Ans: Raoult’s law

Q13.	3 moles of P and 2 moles of Q are mixed, what will be their total vapour pressure in the solution if their partial vapour pressures are 80 and 60 torr respectively?
	A.80 torr
	B.140 torr
	C.72 torr
	D.70 torr

Ans: 72 torr

Q14.	Which of the following solutions shows positive deviation from Raoult’s law?
	A.Acetone + Aniline
	B.Acetone + Ethanol
	C.Water + Nitric acid
	D.Chloroform + Benzene

Ans: Acetone + Ethanol

Q15.	The system that forms maximum boilingazetrope is
	A.Acetone-chloroform
	B.ethanol-acetone
	C.n-hexane-n-heptane
	D.carbon disulphide-acetone

Ans: Acetone-chloroform

Q16.	A plant cell shrinks when it is kept in a
	A.hypotonic solution
	B.hypertonic solution
	C.isotonic solution
	D.pure water

Ans: hypertonic solution

Q17.	The relative lowering in vapour pressure is proportional to the ratio of number of
	A.solute molecules to solvent molecules
	B.solvent molecules to solute molecules
	C.solute molecules to the total number of molecules in solution
	D.solvent molecules to the total number of molecules in solution

Ans: solute molecules to the total number of molecules in solution

Q18.	A solution containing 10.2 g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine?
	A.91.8 g
	B.1198 g
	C.83.9 g
	D.890.3 g

Ans: 91.8 g

Q19.	What weight of glycerol should be added to 600 g of water in order to lower its freezing point by 10°C ?
	A.496 g
	B.297 g
	C.310 g
	D.426 g

Ans: 297 g

Q20.	The osmotic pressure of a solution can be increased by
	A.increasing the volume
	B.increasing the number of solute molecules
	C.decreasing the temperature
	D.removing semipermeable membrane