None

Boost Your Prep with Free Practice Questions!

JEE Main Chemistry Some Basic Concepts of Chemistry Practice Questions

Question 1.

Combustion of glucose $(C_{6} H_{12} O_{6})$ produces ${CO}_{2}$ and water. The amount of oxygen (in $g$ ) required for the complete combustion of $900 g$ of glucose is :

[Molar mass of glucose in $g {mol}^{- 1} = 180$ ]

480

800

960

Question 2.

Molality $(m)$ of $3 M$ aqueous solution of $NaCl$ is :(Given : Density of solution $= 1.25 g {mL}^{- 1}$ , Molar mass in $g {mol}^{- 1} : Na - 23, Cl - 35.5$ )

2.90 m

3.85 m

1.90 m

2.79 m

Question 3.

The density of ' $x$ ' $M$ solution (' $x$ ' molar) of $NaOH$ is $1.12 g {mL}^{- 1}$ , while in molality, the concentration of the solution is $3 m$ ( 3 molal). Then $x$ is

(Given : Molar mass of $NaOH$ is $40 g / mol$ )

3.8

3.0

3.5

2.8

Question 4.

The number of moles of methane required to produce $11 g {CO}_{2} (g)$ after complete combustion is : (Given molar mass of methane in $g {mol}^{- 1} : 16$ )

0.35

0.25

0.5

0.75

Question 5.

An organic compound has $42.1 %$ carbon, $6.4 %$ hydrogen and remainder is oxygen. If its molecular weight is 342 , then its molecular formula is :

C_{14} H_{20} O_{10}

C_{12} H_{22} O_{11}

C_{12} H_{20} O_{12}

C_{11} H_{18} O_{12}

Question 6.

The Molarity (M) of an aqueous solution containing $5.85 g$ of $NaCl$ in $500 mL$ water is : (Given : Molar Mass $Na : 23$ and $Cl : 35.5 {gmol}^{- 1}$ )

0.2

Question 7.

A sample of ${CaCO}_{3}$ and ${MgCO}_{3}$ weighed $2.21 g$ is ignited to constant weight of $1.152 g$ . The composition of mixture is :

(Given molar mass in $g {mol}^{- 1} {CaCO}_{3} : 100, {MgCO}_{3} : 84$ )

1.187 g {CaCO}_{3} + 1.187 g {MgCO}_{3}

1.187 g {CaCO}_{3} + 1.023 g {MgCO}_{3}

1.023 g {CaCO}_{3} + 1.187 g {MgCO}_{3}

1.023 g {CaCO}_{3} + 1.023 g {MgCO}_{3}

Question 8.

If a substance ' $A$ ' dissolves in solution of a mixture of ' $B$ ' and ' $C$ ' with their respective number of moles as $n_{A}, n_{B}$ and $n_{C_{3}}$ . Mole fraction of $C$ in the solution is

\frac{n_{C}}{n_{A} \times n_{B} \times n_{C}}

\frac{n_{B}}{n_{A} + n_{B}}

\frac{n_{C}}{n_{A} + n_{B} + n_{C}}

\frac{n_{C}}{n_{A} - n_{B} - n_{C}}

Question 9.

The quantity which changes with temperature is :

Molality

Molarity

Mole fraction

Mass percentage

Question 10.

A metal chloride contains $55.0 %$ of chlorine by weight . $100 mL$ vapours of the metal chloride at STP weigh $0.57 g$ . The molecular formula of the metal chloride is

(Given: Atomic mass of chlorine is $35.5 u$ )

{MCl}_{2}

{MCl}_{4}

{MCl}_{3}

MCl

Question 1.

A solution is prepared by adding $2 g$ of " $X$ " to 1 mole of water. Mass percent of " $X$ " in the solution is :

20%

10%

Question 2.

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$

Assertion A : $3.1500 g$ of hydrated oxalic acid dissolved in water to make $250.0 mL$ solution will result in $0.1 M$ oxalic acid solution.

Reason $R$ : Molar mass of hydrated oxalic acid is $126 g {mol}^{- 1}$

In the light of the above statements, choose the correct answer from the options given below.

Both A and R are true but R is NOT the correct explanation of A

A is true but R is false

Both A and R are true and R is the correct explanation of A

A is false but R is true

Question 3.

Match List I with List II

	List - I		List - II ( $Δ_{0}$ )
A.	16 g of ${CH}_{4} (g)$	I.	Weighs 28 g
B.	1 g of $H_{2} (g)$	II.	$60.2 \times 10^{23}$ electrons
C.	1 mole of $N_{2} (g)$	III.	Weighs 32 g
D.	0.5 mol of ${SO}_{2} (g)$	IV.	Occupies 11.4 L volume of STP

Choose the correct answer from the options given below:

A-II, B-III, C-IV, D-I

A-II, B-IV, C-I, D-III

A-I, B-III, C-II, D-IV

A-II, B-IV, C-III, D-I

Question 4.

The number of molecules and moles in 2.8375 litres of O $_{2}$ at STP are respectively

1.505

\times

^{23}

and 0.250 mol

7.527

\times

^{22}

and 0.250 mol

7.527

\times

^{23}

and 0.125 mol

7.527

\times

^{22}

and 0.125 mol

Question 5.

Which of the following have same number of significant figures?

A. 0.00253

B. 1.0003

C. 15.0

D. 163

Choose the correct answer from the options given below

A, C and D only

B and C only

A, B and C only

C and D only

Question 6.

The volume of $0.02 M$ aqueous $HBr$ required to neutralize $10.0 mL$ of $0.01 M$ aqueous $Ba (OH)_{2}$ is (Assume complete neutralization)

7.5 mL

5.0 mL

10.0 mL

2.5 mL

Question 7.

When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the molecular formula of

A

C_{9} H_{8}

C_{5} H_{8}

C_{11} H_{4}

C_{11} H_{8}

Question 8.

1 L, 0.02 M

solution of

[Co {({NH}_{3})}_{5} {SO}_{4}]

Br is mixed with

1 L, 0.02 M

solution of

[Co {({NH}_{3})}_{5} Br] {SO}_{4}

. The resulting solution is divided into two equal parts

(X)

and treated with excess of

{AgNO}_{3}

solution and

{BaCl}_{2}

solution respectively as shown below:

1 L

Solution

(X) + {AgNO}_{3}

solution (excess)

⟶ Y

1 L

Solution

(X) + {BaCl}_{2}

solution (excess)

⟶ Z

The number of moles of

Y

and

Z

respectively are

0 .01, 0.01

0.01, 0.02

0.02, 0.01

0.02, 0.02

Question 9.

When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?

C_{9} H_{6}

C_{6} H_{6}

C_{8} H_{6}

C_{9} H_{9}

Question 10.

What is the mass ratio of ethylene glycol ( $C_{2} H_{6} O_{2}$ , molar mass = 62 g/mol) required for making 500 g of 0.25 molal aqueous solution and 250 mL of 0.25 molar aqueous solution?

1 : 2

1 : 1

2 : 1

3 : 1

JEE Main Some Basic Concepts of Chemistry Practice Questions With Solutions

JEE Main Chemistry Some Basic Concepts of Chemistry Practice Questions

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

Other Topics of that Section

Quick Links

Still have questions about JEE Main ? Ask us.

Related News

Related Articles

Popular Degrees

Popular Specializations

Engineering Colleges in States

Engineering Colleges in Cities

Popular Engineering Exams

Engineering Colleges by College Type