Balaji Chemistry Class 11. We covered all the Balaji Chemistry Class 11 in this post for free so that you can practice well for the exam.
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Balaji Chemistry Class 11 Objective for Students
Assuming complete ionization pH of 0.1 M HCl is 1. The molarity of H₂SO4 with the same pH is
(A) 0.2
(B) 0.1
(C) 2.0
(D) 0.05
Option d – 0.05
50 ml of 0.1 M HCl and 49.9 ml of 0.1 M NaOH are mixed. The pH of the resulting mixture solution is ( Balaji Chemistry Class 11 MCQ )
(A) 7
(B) 6.8
(C) 4
(D) 6.0
Option c – 4
Which salt hydrolyzed?
(A) CH3COONa
(B) K₂SO4
(C) KNO3
(D) NaCl
Option a – CH3COONa
Any precipitate is formed when ( Balaji Chemistry Class 11 MCQ )
(A) I.P. = Ksp
(B) I.P < Ksp
(C) I.P. > Ksp
(D) Solution is unsaturated
Option c – I.P. > Ksp
the pH of H₂SO4 solution, whose molar concentration is equal to that of NaOH of pH = 12 is
(A) 2
(B) 1.3010
(C) 0.3010
(D) 1.6990
Option d – 1.6990
the pH of solution 3 is mixed with the pH of solution 6 in equal volumes, and the pH of the resulting solution is ( Balaji Chemistry Class 11 MCQ )
(A) 3.5
(B) 4
(C) 3.3
(D) 4.5
Option c – 3.3
50 ml of pH = 11 and 50 ml of pH = 3 are mixed together. The pH of the solution is
(A) 7
(B) 9
(C) 14
(D) 5
Option a – 7
the pH of sodium hydroxide was obtained when 0.04 g of it dissolved in water to get a 100 ml solution ( Balaji Chemistry Class 11 MCQ )
(A) 12
(B) 13
(C) 1
(D) 2
Option a – 12
The pH of decimolar solution of NH4OH when it is 20% ionized
(A) 12.95
(B) 13.3
(C) 11.27
(D) 12.3
Option d – 12.3
The increase in equivalent conductance of a weak electrolyte with dilution is due to ( Balaji Chemistry Class 11 MCQ )
(A) an increase in the degree of dissociation and an increase in ionic mobility
(B) an increase in the degree of dissociation and a decrease in ionic mobility
(C) a decrease in the degree of dissociation and an increase in ionic mobility
(D) All of these
Option a – an increase in the degree of dissociation and an increase in ionic mobility
Electrolytes can conduct electricity because
(A) The molecules contain unpaired electrons which are mobile.
(B) Their molecules contain loosely held electrons which get free under the influence of voltage.
(C) The molecules break up into ions when a voltage is applied.
(D) The molecules are broken up into ions when the electrolyte is fused or dissolved in the solvent.
Option d – The molecules are broken up into ions when the electrolyte is fused or dissolved in the solvent
The conductance of 1 cm³ of a solution is its ( Balaji Chemistry Class 11 MCQ )
(A) Specific conductance
(B) Equivalent conductance
(C) Molar conductance
(D) Resistance
Option a – Specific conductance
Which of the following does not conduct electricity?
(A) Crystalline NaCl
(B) CuSO4
(C) Graphite
(D) NaCl crystal having a defect
Option a – Crystalline NaCl
The reaction is spontaneous if the cell potential ( Balaji Chemistry Class 11 MCQ )
(A) positive
(B) Negative
(C) Zero
(D) Infinite
Option a – positive
Which aqueous solution will not have an electric current?
(A) Glycerol
(B) Glycol
(C) Hydrochloric acid
(D) Pure water
Option c – Hydrochloric acid
Strong electrolytes are those that
(A) Dissolve readily in water
(B) Conduct Electricity
(C) Dissociate into ions
(D) Completely dissociate into all dilutions
Option d – Completely dissociate into all dilutions
Electrochemistry is a branch of physical science that studies about ( Balaji Chemistry Class 11 MCQ )
(A) Physical change
(B) Chemical change
(C) Chemical and electrical change
(D) Mechanical change
Option c – Chemical and electrical change
Electrolysis involves oxidation and reduction respectively at
(A) Anode and cathode
(B) Cathode and anode
(C) At both electrodes
(D) None of the above
Option a – Anode and cathode
Electrolytes when dissolved in water dissociate into ions because ( Balaji Chemistry Class 11 MCQ )
(A) They are unstable
(B) The water dissociates it
(C) The force of repulsion increases
(D) The force of electrostatic attraction is broken down by water.
Option d – The force of electrostatic attraction is broken down by water
The flow of current in an electrolyte is due to the movement of
(A) Electrons
(B) Ions
(C) Protons
(D) Molecules
Option b – Ions
Pure water does not conduct electricity because it ( Balaji Chemistry Class 11 MCQ )
(A) Is neutral
(B) Is readily decomposed
(C) Has a low boiling point
(D) is almost totally unionized.
Option d – is almost totally unionized
The heat of combustion of ethylene is -337 Kcal. If 5.6 Lit of O2(g) is used at STP, in the combustion heat produced is
(A) 28.08 Kcal
(B) 14.04 Kcal
(C) 42.06 Kcal
(D) 56.16 Kcal
Option a – 28.08 Kcal
The enthalpy is the maximum for ( Balaji Chemistry Class 11 MCQ )
(A) 10 gms of water
(B) 10 g of ice
(C) 10 gms of steam
(D) Same to all
Option c – 10 gms of steam
In which process is net work done is zero
(A) Cyclic
(B) Adiabatic
(C) Free Expansion
(D) Isochoric
Option c – Free Expansion
Enthalpy (H) equal to ( Balaji Chemistry Class 11 MCQ )
(A) Internal energy (v)
(B) Product of pressure (P) and volume (V)
(C) Internal energy (U + PV)
(D) Work done by a system
Option c – Internal energy (U + PV)
Calculate the work done when 1 mol of an ideal gas is compressed reversibly from 1 bar to 4 bar at a constant temperature of 300 K.
(A) 4.01 kJ
(B) 3.458 kJ
(C) 18.02 kJ
(D) -14.01 kJ
Option b – 3.458 kJ
Which is not an endothermic reaction among the following?
(A) Combustion of methane
(B) Decomposition of water
(C) Dehydration of ethane to ethene
(D) Conversion of graphite to diamond
Option a – Combustion of methane
The standard molar enthalpy of the formation of CO2 is equal to ( Balaji Chemistry Class 11 MCQ )
(A) Zero
(B) Standard molar enthalpy of combustion
(C) the Sum of standard molar enthalpies of the formation of CO(g) and CO2
(D) Standard molar enthalpy of combustion of carbon
Option d – Standard molar enthalpy of combustion of carbon
Enthalpy change is equal to internal energy change when
(A) All reactants and products are solutions.
(B) Reaction in a closed container
(C) No. of moles of gases reactants and products are equal.
(D) Reaction occurs at constant pressure.
Option c – No. of moles of gases reactants and products are equal
Which of the following species have zero enthalpies at their standard state? ( Balaji Chemistry Class 11 MCQ )
(A) Br2
(B) Cl2
(C) H₂O
(D) CH4
Option b – Cl2
The free energy change of a reaction is zero when
(A) The reactants are initially mixed
(B) A catalyst is added
(C) the System is at an equilibrium
(D) the Reactants are completely consumed.
Option c – the System is at an equilibrium
The change in entropy of an ideal gas during reversible isothermal expansion is
(A) Negative
(B) Zero
(C) Positive
(D) Infinite
Option c – Positive
Lewis acid is
(A) Electron pair accepter
(B) Electron pair doner
(C) Proton accepter
(D) Proton doner
Option a – Electron pair accepter
Which does not forms a buffer solution?
(A) NaH₂PO4 + Na₂HPO4
(B) H₂CO3 + NaHCO3
(C) NH4Cl + NH4Cl
(D) KOH + K₂SO4
Option d – KOH + K₂SO4
The pH of the solution obtained by mixing 50 ml of 1 M HCI and 30 ml, of 1 M NaOH solution is
(A) 3.979
(B) 0.6021
(C) 12.042
(D) 0.3979
Option b – 0.6021
The pH of neutral water is 6.5. The temperature of the water is
(A) 25°C
(B) > 25°C
(C) < 25°C
(D) Cannot predict
Option b – > 25°C
50 ml of 0.2 M HCl treated with 0.1 M NaOH solution. the volume of NaOH required for the complete neutralization of acid is
(A) 25 ml
(B) 50 ml
(C) 100 ml
(D) 200 ml
Option c – 100 ml
How many grams equivalents of NaOH are required to neutralize 25 cm³ of decimolar HCl solution? to
(A) 0.00125
(B) 0.0025
(C) 0.0050
(D) 0.025
Option b – 0.0025
pKa of weak acid HA is 4.5. The pOH of an aqueous buffer solution of HA in which 50% acid is ionized is
(A) 7.0
(B) 4.5
(C) 2.5
(D) 9.5
Option d – 9.5
40 ml of 0.1 M ammonia is mixed with 20 ml of 0.1 M HCI. What is the pH of the mixture? (pKb of NH3 = 4.74)
(A) 4.74
(B) 2.76
(C) 9.09
(D) 5.00
Option c – 9.09
NH4OH is a weak base, but it still becomes weak with the addition of
(A) 0.2 M CH3COONa
(B) 0.2 M CH3COONH4
(C) 0.2 M H₂SO4
(D) 0.2 M NH4Cl
Option d – 0.2 M NH4Cl
In addition to a small quantity of strong acid the pH of the buffer solution
(A) Decreases
(B) Increases
(C) Remains constant
(D) Does not change considerably
Option d – Does not change considerably
20 ml of HCl solution neutralizes by 40 ml of 0.05 M KOH solution. The pH of HCI is
(A) 1
(B) 1.5
(C) 0.1
(D) 2
Option a – 1
Which of the following is a Bronsted acid but not a Bronsted base?
(A) H₂S
(B) HCO3
(C) H₂O
(D) NH3
Option a – H₂S
Ostwald’s dilution formula is applicable for
(A) Weak electrolytes
(B) Strong electrolytes
(C) Both ‘A’ and ‘B’
(D) Only for weak salt
Option a – Weak electrolytes
The salt which undergoes anion hydrolysis is
(A) CuSO4
(B) FeCl3
(C) NH4Cl
(D) Na2CO3
Option d – Na2CO3
On addition of sodium cyanide in water
(A) pH increases
(B) pH decreases
(C) pH = constant
(D) pH becomes zero
Option a – pH increases
When 25 ml of 0.02 M NH4OH and 25 ml of 0.2 M NH4Cl are mixed to form a buffer solution. The pH of the solution is (pKb = 4.8 for NH4OH)
(A) 5.8
(B) 8.2
(C) 3.8
(D) 4.8
Option b – 8.2
Which of the following aq. the solution is acidic in nature?
(A) NaCl
(B) NaHCO3
(C) CuCl₂
(D) KCI
Option c – CuCl₂
The pKa value of the strongest carboxylic acid is
(A) 4.19
(B) 3.41
(C) 4.76
(D) 0.23
Option d – 0.23
the pH of 0.01 M H₂SO4 solution is
(A) 2
(B) 1.6990
(C) 0.2
(D) 2.6990
Option b – 1.6990
100 ml of 1 M HCl mixed with 200 ml of 0.5 MI NaOH solution. The pH of the resulting mixture is
(A) >7
(B) <7
(C) = 0
(D) =7
Option d – =7
the pH of a strong acid is 2. If 100 ml of strong acid is mixed with 900 ml of water. The resulting solution will have a pH
(A) 10
(B) 1
(C) 0.4
(D) 3
Option d – 3
A solution is 1 M sodium acetate and 10 Macetic acid. If pKa is 4.6. The pH of the solution is
(A) 0.46
(B) 3.6
(C) 4.6
(D) 5.6
Option b – 3.6
A solution containing 2 M each of NH4OH and NH4Cl. If pKa for NH4OH is 4.7. The pH of a solution is
(A) 4.7
(B) 9.3
(C) 7
(D) 9
Option b – 9.3
What happens to F.P. of benzene when naphthalene is added?
(A) Increases
(B) Decreases
(C) remains unchanged
(D) First decreases, then increases
Option b – Decreases
The abnormal molar mass of the solute is due to
(A) Association
(B) Dissociation
(C) Association or dissociation
(D) Neither association nor dissociation
Option c – Association or dissociation
The i for 0.005 M aq. KCl solution is 1.95. The degree of dissociation of KCl is
(A) 0.95
(B) 0.97
(C) 0.94
(D) 0.96
Option a – 0.95
Association or dissociation of solute (electrolyte) in solvent molar mass of solute
(A) Increase
(B) Decreases
(C) May increase or decrease
(D) Remains constant
Option c – May increase or decrease
Van’t a Hoff factor (i) for a solute that undergoes dissociation in one solvent and association in another solvent is respectively
(A) Greater than one and greater than one
(B) Less than one and greater than one
(C) Greater than one and less than one
(D) Less than one and less than one
Option b – Less than one and greater than one
X solute dissolved in a solvent associated to form pentamer. i value is
(A) 0.5
(B) 5
(C) 0.2
(D) 0.1
Option c – 0.2
What is the effect on the freezing point of water adding urea in water?
(A) FP. decreases
(B) F.P. increases
(C) FP doubles
(D) F.P. remains constant
Option a – FP. decreases
A solution of sucrose (molar mass 342) has been prepared by dissolving 68.5 of sucrose in 1 kg of water. The freezing point of the solution will be (Kf = 1.86 C/m)
(A) -0.372 °C
(B) -0.520 °C
(C) +0.372 °C
(D) -570 °C
Option a – -0.372 °C
For a nonelectrolyte solution Van’t a Hoff factor (i) equal to
(A) 0
(B) 1
(C) 2
(D) Between 1 and 2
Option b – 1
A substance ‘A’ dissolved in solvent ‘B’ shows molar mass A3. i value is
(A) 1
(B) 2
(C) 2
(D) 1/3
Option d – 1/3
Van’t the Hoff factor of equal concentration of x, y, and z is 1.8, 0.8, and 2.5 then the correct order will be
(A) Boiling point x <y<Z
(B) Freezing point z<x<y
(C) Osmotic pressure x = y = z
(D) Vapour pressure y<x< Z
Option b – Freezing point z
Which of the following is not a sub-atomic particle?
(a) Neutron
(b) Proton
(c) Deuteron
(d) Electron
Option c – Deuteron
The Nucleus of an atom consists of the
(a) proton
(b) neutron
(c) proton and neutron
(d) electron, proton, and neutron
Option c – proton and neutron
Which statement(s) is/are correct regarding Daltons’ Atomic theory? I. All matter is made of very tiny particles. II. Atoms of different elements have different masses and chemical properties. III. The relative number of atoms is variable in any compound. Codes
(a) Only I and II
(b) Only I and III
(c) Only II and III
(d) All I, II, and III
Option a – Only I and II
The absolute value of charge on an electron was determined by
(a) JJ Thomson
(b) Rutherford
(c) Priestly
(d) RA Millikan
Option d – RA Millikan
Electrons move around the nucleus in ……. motion.
(a) translatory
(b) spin
(c) orbital
(d) vibrational
Option c – orbital
In an X-ray tube, a potential difference of several thousand volts accelerates electrons which then hit the target, and X-rays are emitted. Why are the X-rays emitted?
(a) Because of electron transition in an atom.
(b) Because of the removal of an electron from an atom.
(c) Because electrons get decelerated.
(d) Because of the heat produced in the collision.
Option c – Because electrons get decelerated
Which of the following are the properties of an electron? I. Electron is a constituent of the cathode ray. II. Electron is a negatively charged particle. III. The mass of the electron is equal to the mass of the proton. IV. Electron is deflected by the electric field but not by a magnetic field. Select the correct answer using the codes given below.
(a) I and II
(b) I, II and III
(c) III and IV
(d) I and IV
Option a – I and II
An atomic number of an atom gives the number of which of the following?
(a) Electrons
(b) Protons
(c) Neutrons
(d) Neutrons and Protons
Option b – Protons
Which of the following is the correct statement about proton?
(a) Proton is the nucleus of deuterium.
(b) Proton is a particle.
(c) Proton is an ionized hydrogen molecule.
(d) Proton is ionized hydrogen.
Option d – Proton is ionized hydrogen
In an atom, the neutron was discovered by
(a) JJ Thomson
(b) Chadwick
(c) Rutherford
(d) Newton
Option b – Chadwick
Which of the following elements does not contain neutrons?
(a) Oxygen
(b) Nitrogen
(c) Hydrogen
(d) Copper
Option c – Hydrogen
A neutron is a fundamental particle carrying
(a) a charge of +1 and a mass of 1 unit.
(b) no charge and no mass.
(c) no charge and a mass of 1 unit.
(d) a charge of -1 and a mass of 1 unit.
Option c – no charge and a mass of 1 unit
Which one of the following statements is correct?
(a) Only electrons reside inside the nucleus of an atom.
(b) Both electrons and protons reside inside the nucleus of an atom.
(c) Only neutrons reside inside the nucleus of an atom.
(d) Both protons and neutrons can reside inside the nucleus of an atom.
Option d – Both protons and neutrons can reside inside the nucleus of an atom
Consider the following statements. I. The neutron was discovered in 1932 by bombarding beryllium with a-rays. II. The electron and proton have equal but opposite electron charges. III. The neutron is not charged. Which of the statement given above is/are correct?
(a) I and II
(b) II and III
(c) I and III
(d) I, II and III
Option d – I, II and III
Electrons in the highest energy level of an atom are called
(a) valence protons
(b) orbital protons
(c) valence electrons.
(d) orbital electrons
Option c – valence electrons
A body is charged negatively. It implies that
(a) it has lost some of its protons.
(b) it has lost some of its electrons.
(c) it has gained some electrons from the outside.
(d) None of the above
Option c – it has gained some electrons from the outside
Which one among the following statements about an atom is not correct?
(a) Atoms always combine to form molecules.
(b) Atoms are the basic units from which molecules and ions are formed.
(c) Atoms are always neutral in nature.
(d) Atoms aggregate in large numbers to form the matter we can see, feel and touch.
Option d – Atoms aggregate in large numbers to form the matter we can see, feel and touch
Consider the following statements I. The positive charge is essentially immovable because it contains practically all the mass of the atom. II. An atom is the smallest indivisible particle of an element that takes part in a chemical reaction. Which of the above statements is/are correct?
(a) Only I
(b) Only II
(c) I and II
(d) None of these
Option c – I and II
Who is regarded as the Father of Modern Chemistry?
(a) Rutherford
(b) Einstein
(c) Lavoisier
(d) CV Raman
Option c – Lavoisier
Who among the following proposed that the atom is indivisible?
(a) Dalton
(b) Berzelius
(c) Rutherford
(d) Avogadro
Option a – Dalton
A single type of atom is found in
(a) compounds of minerals.
(b) a mixture of minerals.
(c) native elements.
(d) None of the above
Option c – native elements
Atoms of different elements have
(a) the same atomic number and the same electronic configuration.
(b) different atomic numbers and the same electronic configuration.
(c) different atomic numbers and different numbers of valence electrons.
(d) a same number of electrons and neutrons.
Option c – different atomic numbers and different numbers of valence electrons
Which one of the following statements about an atom is not correct? ( Class 12 Chemistry Chapter 1 MCQ )
(a) Atoms of different elements may have the same mass numbers.
(b) Atoms of elements may have different mass numbers.
(c) All the atoms of an element have the same number of protons.
(d) All the atoms of an element will always have the same number of neutrons.
Option d – All the atoms of an element will always have the same number of neutrons
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