Class 11 Chemistry | ICSE Board Board | Mixed Level Practice Test - 40 Questions (2026)

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Q1 MCQ

Which of the following statements is correct regarding the photoelectric effect?

A The number of photoelectrons emitted is independent of the intensity of incident light.

B The kinetic energy of photoelectrons increases linearly with the intensity of incident light.

C There exists a threshold frequency below which no photoelectrons are emitted, regardless of the intensity of light.

D The kinetic energy of photoelectrons is independent of the frequency of incident light.

Q2 MCQ

What is the IUPAC name of the organic compound with the formula $CH_3CH(CH_3)CH_2COOH$?

A 3-Methylbutanoic acid

B 2-Methylbutanoic acid

C Isopentanoic acid

D 2-Methylpropanoic acid

Q3 MCQ

What is the number of moles of oxygen atoms present in 90 g of $H_2O$?

A 5 moles

B 10 moles

C 15 moles

D 20 moles

Q4 MCQ

Which of the following species has the highest bond order?

A $O_2$

B $O_2^+$

C $O_2^-$

D $O_2^{2-}$

Q5 MCQ

What is the pH of a $0.001$ M solution of $HCl$?

A 1

B 2

C 3

D 11

Q6 MCQ

In the reaction $N_2(g) + 3H_2(g) ightleftharpoons 2NH_3(g)$, increasing the pressure will:

A Shift the equilibrium to the left.

B Shift the equilibrium to the right.

C Have no effect on the equilibrium.

D Increase the value of the equilibrium constant.

Q7 MCQ

Which of the following halides is most reactive towards $S_N1$ reaction?

A $CH_3Cl$

B $CH_3CH_2Cl$

C $(CH_3)_2CHCl$

D $(CH_3)_3CCl$

Q8 MCQ

What is the oxidation number of chromium in $K_2Cr_2O_7$?

A +2

B +3

C +6

D +7

Q9 MCQ

Which of the following gases contributes most to the greenhouse effect?

A Oxygen

B Nitrogen

C Carbon Dioxide

D Hydrogen

Q10 MCQ

If the rate constant for a first-order reaction is $k = 2.303 imes 10^{-2} s^{-1}$, what time will be required for 50% completion of the reaction? (Given: $log_{10}2 = 0.3010$)

A 10 seconds

B 20 seconds

C 30 seconds

D 40 seconds

Q11 MCQ

Which of the following molecules has the highest dipole moment?

A CO$_2$

B NH$_3$

C BF$_3$

D CCl$_4$

Q12 MCQ

The de Broglie wavelength of an electron moving with a velocity of $3 \times 10^6$ m/s is closest to (Planck's constant, $h = 6.626 \times 10^{-34}$ Js, mass of electron, $m = 9.1 \times 10^{-31}$ kg):

A 0.243 nm

B 2.43 nm

C 24.3 nm

D 0.0243 nm

Q13 MCQ

Which of the following statements is correct regarding the properties of alkali metals?

A Ionization enthalpy increases down the group.

B Hydration enthalpy decreases down the group.

C Atomic size decreases down the group.

D Electronegativity increases down the group.

Q14 MCQ

What is the effect on the equilibrium of the reaction N$_2$(g) + 3H$_2$(g) $\rightleftharpoons$ 2NH$_3$(g) + Heat, if the pressure is increased?

A The equilibrium shifts to the left.

B The equilibrium shifts to the right.

C There is no effect on the equilibrium.

D The reaction rate decreases.

Q15 MCQ

Which of the following species is isoelectronic with Ne?

A Na$^+$

B Mg$^{2+}$

C O$^{2-}$

D All of the above

Q16 MCQ

The empirical formula of a compound is CH$_2$O. If its molar mass is 180 g/mol, what is its molecular formula?

A CH$_2$O

B C$_2$H$_4$O$_2$

C C$_3$H$_6$O$_3$

D C$_6$H$_{12}$O$_6$

Q17 MCQ

Which of the following is the strongest oxidizing agent?

A F$_2$

B Cl$_2$

C Br$_2$

D I$_2$

Q18 MCQ

What is the pH of a 0.001 M solution of HCl?

A 1

B 2

C 3

D 11

Q19 MCQ

Which of the following compounds exhibits hydrogen bonding?

A CH$_4$

B H$_2$S

C NH$_3$

D HCl

Q20 MCQ

What is the IUPAC name for the compound with the formula CH$_3$-CH(Cl)-CH$_2$-CH$_3$?

A 2-Chlorobutane

B 3-Chlorobutane

C 1-Chloro-2-methylpropane

D 2-Methyl-1-chloropropane

Q21 MCQ

Which of the following species is isoelectronic with $K^+$?

A $Ca^{2+}$

B $Cl$

C $Na^+$

D $Ar^+$

Q22 MCQ

The empirical formula of a compound is $CH_2O$. If its molar mass is 180 g/mol, what is its molecular formula?

A $C_3H_6O_3$

B $C_6H_{12}O_6$

C $C_4H_8O_4$

D $C_5H_{10}O_5$

Q23 MCQ

Which of the following statements is true regarding the photoelectric effect?

A The kinetic energy of the emitted electrons is independent of the frequency of the incident light.

B The number of emitted electrons is directly proportional to the intensity of the incident light above the threshold frequency.

C Photoelectric effect occurs for all frequencies of incident light.

D The kinetic energy of the emitted electrons increases with increasing intensity of light.

Q24 MCQ

Which of the following molecules is non-polar despite having polar bonds?

A $H_2O$

B $NH_3$

C $CO_2$

D $SO_2$

Q25 MCQ

What volume of $0.2$ M $NaOH$ solution is required to neutralize $20$ mL of $0.1$ M $H_2SO_4$ solution?

A 10 mL

B 20 mL

C 30 mL

D 40 mL

Q26 MCQ

Which of the following has the highest ionization enthalpy?

A Na

B Mg

C Al

D Si

Q27 MCQ

According to Le Chatelier's principle, what will be the effect of increasing pressure on the following equilibrium reaction? $N_2(g) + 3H_2(g) ightleftharpoons 2NH_3(g)$

A The equilibrium will shift to the left.

B The equilibrium will shift to the right.

C There will be no effect on the equilibrium.

D The rate of the forward reaction will decrease.

Q28 MCQ

Which of the following statements regarding sigma ($\sigma$) and pi ($\pi$) bonds is correct?

A A sigma bond is formed by the sideways overlapping of p-orbitals.

B A pi bond is stronger than a sigma bond.

C A single bond is always a sigma bond.

D A double bond consists of two sigma bonds.

Q29 MCQ

What is the IUPAC name of the following compound: $CH_3-CH(CH_3)-CH_2-CH_3$?

A 2-Methylbutane

B 3-Methylbutane

C 2-Ethylpropane

D 1,1-Dimethylpropane

Q30 MCQ

What is the pH of a $0.001$ M solution of $NaOH$ at $25^\circ C$?

A 3

B 11

C 1

D 13

Q31 MCQ

Which of the following molecules is nonpolar despite having polar bonds?

A $H_2O$

B $NH_3$

C $CO_2$

D $SO_2$

Q32 MCQ

What is the IUPAC name of the compound with the following structure: $CH_3-CH(CH_3)-CH_2-CH=CH_2$?

A 2-methyl-4-pentene

B 4-methyl-1-pentene

C 2-methyl-1-pentene

D 4-methyl-4-pentene

Q33 MCQ

Which of the following elements has the highest electronegativity?

A Oxygen

B Nitrogen

C Fluorine

D Chlorine

Q34 MCQ

What is the oxidation number of sulfur in $H_2SO_4$?

A +2

B +4

C +6

D -2

Q35 MCQ

Which of the following represents Boyle's Law?

A $V \propto T$ (at constant n, P)

B $P \propto T$ (at constant n, V)

C $V \propto rac{1}{P}$ (at constant n, T)

D $P \propto n$ (at constant V, T)

Q36 MCQ

What is the shape of the $SF_6$ molecule according to VSEPR theory?

A Tetrahedral

B Octahedral

C Trigonal bipyramidal

D Square planar

Q37 MCQ

The enthalpy change for a reaction is $-50 kJ/mol$. What can be inferred about the reaction?

A The reaction is endothermic.

B The reaction is exothermic.

C The reaction is at equilibrium.

D The reaction is non-spontaneous.

Q38 MCQ

What is the conjugate base of $H_2PO_4^-$?

A $H_3PO_4$

B $HPO_4^{2-}$

C $PO_4^{3-}$

D $H_3O^+$

Q39 MCQ

Which of the following species has the same number of lone pairs as $XeF_4$?

A $ICl_2^-$

B $H_2O$

C $NH_3$

D $SF_4$

Q40 MCQ

The enthalpy change for a reaction is -40 kJ/mol. The activation energy, $E_a$, for the forward reaction is 60 kJ/mol. What is the activation energy for the reverse reaction?

A 20 kJ/mol

B 100 kJ/mol

C -20 kJ/mol

D -100 kJ/mol

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