Class 11 Chemistry Modal Question Paper 2023 [SET-01]

Class 11th Chemistry Objective Questions

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SET-01

Question 1:

The molecular mass of SO₂ is

A) 30 u
B) 64 u
C) 32 u
D) 46 u
Answer: (B) 64 u

Question 2:

Empirical formula of benzene is:

A) C₆H₆
B) C₂H₂
C) CH
D) C₂H₄
Answer: (A) C₆H₆

Question 3:

The volume of one mole of a gas at NTP is:

A) 11.2 lit
B)  22.4 lit
C) 5.6 lit
D) None of these
Answer: (B) 22.4 lit

Question 4:

The number of moles of solute present in one litre solution is known as:

A) molarity
B) molality
C) normality
D) mole fraction
Answer: (A) molarity

Question 5:

Which of the following does not change with a change in temperature?

A) molarity
B) molality
C) normality
D) None of these
Answer: (B) molality

Question 6:

The amount of CO₂ that could be produced when one mole of carbon is burnt in the air is:

A) 22g
B) 50g
C) 44g
D) 56g
Answer: (C) 44g

Question 7:

Avogadro’s number is equal to:

A) 6.022 x 10²²
B) 6.022 x 10²³
C) 6.022 x 10²⁰
D) 6.022 x 10²¹
Answer: (B) 6.022 x 10²³

Question 8:

The electronic configuration of sodium atom (Na) is:

A) 1s²2s²2p⁶3s¹
B) 1s²2s²p⁶
C) 1s²2s²2p⁶3s²
D) 1s²2s²
Answer: (A) 1s²2s²sp⁶3s¹

Question 9:

The orbital with quantum number n=3 and l=2 will be:

A) 3s
B) 3p
C) 3d
D) 2p
Answer: (C) 3d

Question 10:

Which atom is indicated by the Configuration [He]2s¹?

A) Be
B) Li
C) B
D) C
Answer: (B) Li

Question 11:

Which of the following is lowest energy subshell?

A) 3d
B) 4s
C) 4p
D) 5s
Answer: (B) 4s

Question 12:

How many protons are present in Mg (Atomic no-12, Mass no.-24):

A) 24
B) 20
C) 10
D) 12
Answer: (D) 12

Question 13:

The Bohr’s radius of first orbit of hydrogen atom is:

A) 0.629 Å
B) 0.529 Å
C) 0.429 Å
D) 0.329 Å
Answer: (B) 0.529 Å

Question 14:

The wavelength of the radio wave having frequency 3MHz would be:

A) 100 m
B) 300 m
C) 100 nm
D) 300 nm
Answer: (A) 100 m

Question 15:

Which of the following ions will have largest size?

A) Mg²⁺
B) O^2-
C) Al³⁺
D) F^–
Answer: (B) O^2-

Question 16:

Which group of elements is commonly known as halogens?

A)  Group 16
B) Group 17
C) Group 13
D) Group 15
Answer: (A) Group 17

Question 17:

Which of the following configuration has highest ionization energy?

A) ns²np²
B) ns²np³
C) ns²np⁶
D) ns²np¹
Answer: (C) ns²np¹

Question 18:

An element with atomic number 35 is placed in which period of the periodic table?

A) 3
B) 4
C) 2
D) 1
Answer: (B) 4

Question 19:

Which of the following has highest electronegativity?

A) F
B) Cl
C) N
D) O
Answer: (A) F

Question 20:

How many groups are present in the modern periodic table?

A) 15
B) 18
C) 10
D) 20
Answer: (B) 18

Question 21:

Equal volumes of all the gases under the same conditions of pressure and temperature contain equal number of ‘molecules is known as

A) Charle’s Law
B) Boyle’s Law
C) Avogadro’s Law
D) None of these
Answer: (C) Avogadro’s Law

Question 22:

 PV = nRT is:

A) Ideal gas equation
B) Real gas equation
C) elementary gas equation
D) None of these
Answer: (A) Ideal gas equation

Question 23:

The numerical value of gas constant ‘R’ depends on:

A) the nature of the gas
B) the temperature of the gas
C) the pressure of the gas
D)  the units of measurement
Answer: (A) the nature of the gas

Question 24:

A gas that obeys gas laws at all ranges of temperature and pressure is called

A) Real gas
B) Ideal gas
C) Noble gas
D) None of these
Answer: (B) Ideal gas

Question 25:

For ‘n’ mole of real gas the Vander Waals Equation is:

A) PV = nRT
B) V ∞ n
C) P ∞ 1/V
D) (P + an²/V²)(V – nb) = nRT
Answer: (D) (P + an²/V²)(V – nb) = nRT

Question 26:

What will be the minimum pressure required to compress 500 dm³ of air at 1 bar pressure to 200 dm³ at 30°C?

A) 3.5 bar
B) 2.5 bar
C) 700 bar
D) 900 bar
Answer: (B) 2.5 bar

Question 27:

V/T constant is:

A) Charle’s Law
B) Boyle’s Law
C) Avogadro’s Law
D) None of these
Answer: (A) Charle’s Law

Question 28:

Which element will show a diagonal relationship with Be?

A) Mg
B) Na
C) Al
D) Ca
Answer: (C) Al

Question 29:

The basic strength of which hydroxide is maximum?

A) NaOH
B) LiOH
C) Ca(OH)₂
D) KOH
Answer: (C) Ca(OH)₂

Question 30:

Which of the following is an amphoteric hydroxide?

A) LiOH
B) NaOH
C) Ca(OH)₂
D) Be(OH)₂
Answer: (D) Be(OH)₂

Question 31:

Outer electronic configuration of s-block element is:

A) ns¹
B) ns²
C) ns^1-2
D) ns²nsp^1-6
Answer: (A) ns^1-2

Question 32:

What is the IUPAC name of the compound CH3CH2CH2CH(CI)CHO?

A) 4-Chloropentanal
B) 2-Chloropentanal
C) 2-Chloropentane
D) 2-Chloropentanone
Answer: (B) 2-Chloropentanal

Question 33:

Which of the following is an electrophile?

A) NH₃
B) Cl^–
C) OH^–
D) BF₃
Answer: (D) BF₃

Question 34:

What is the hybridization of carbon atom in methane molecule?

A) sp³
B) sp²
C) sp
D) sp3d
Answer: (A) sp³

Question 35:

 Which of the following exerts +I effect?

A) – CH₃
B) Cl^–
C) – NH₂
D) – NO₂
Answer: (A) – CH₃

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