MATRIC • FSC • NTS • ETEA • CSS • PMS etc MCQs Learn, Practice, Prepare, Succeed! Prepare Today, Succeed Tomorrow!

Q: Choose the one which is not the assumption of collision theory of reaction rate: (ETEA 2015)

A) For chemical reaction to occur molecular particles must collide

B) For reacting molecules/particles must possess a certain minimum amount of energy (the activation energy)

C) Every collision is not productive

D) For hydrogen molecule formation from atoms require specific orientation

Q: Consider the following reaction A + B + C → M + N + O. The fact that enthalpy of M + N + O is higher than that of A + B + C indicates that: (ETEA 2015)

A) The reaction is exothermic

B) The reaction is endothermic

C) Catalyst for the reaction is unnecessary

D) The activation energy required for the reverse reaction is higher than for the forward reaction

Q: The number of colliding molecules of different gases calculated from kinetic molecular theory per liter per second at standard condition is the order of magnitude of: (ETEA 2015)

A) 10²³

B) 10²⁹

C) 10³²

D) 10⁴

Q: The rate law equation for reaction is given as dx/dt = k[FeCl][K₂]. The reaction is: (ETEA 2015)

A) First order

B) Second order

C) Third order

D) Pseudo first order

Q: A zero order reaction is one whose rate is independent of: (ETEA 2015)

A) Temperature

B) Concentration of reactants

C) Concentration of products

D) Material of the vessel in which the reaction is carried out

Q: 3FeCl₂ + 6KI → 2FeI₂ + 6KCl. Rate = k[FeCl₂][KI]². Choose the correct molecularity and order of the reaction respectively: (ETEA 2017)

A) 2 and 2

B) 6 and 2

C) 8 and 3

D) 8 and 2

Q: In a transition state the reactants are: (ETEA 2018)

A) High stable

B) Moderately stable

C) Highly unstable

D) In low energy state

Q: The main difference between catalysis and enzymes is: (ETEA 2018)

A) Enzymes are sharp in action than catalyst

B) Catalysts used in large amount than enzymes

C) Catalysts are inorganic while enzymes are organic in nature

D) Enzymes need pH while catalysis do not

Q: The minimum energy below which no reaction occurs in reactant molecules is: (ETEA 2018)

A) Average K·E of the molecules

B) Potential energy of the molecules

C) Free energy of the molecules

D) Activation energy of the molecules

Q: For a reversible reaction, the catalyst increases the speed of: (ETEA 2019)

A) Forward reaction

B) Backward reaction

C) Both forward and backward reactions equally

D) Forward reaction to larger extent than backward reaction

Q: 2N₂O → 4NO + O₂. This reaction is an example of .... order reaction: (ETEA 2019)

A) 1st

B) 2nd

C) 3rd

D) Zero

Q: For exothermic reversible reaction, activation energy for forward direction depends upon: (ETEA 2019)

A) Temperature

B) Nature of reactant

C) Nature of product

D) Both (a) & (b)

Q: A solution of 2.0 g NaOH dissolved in 1000 g of water has the following concentration: (ETEA 2005)

A) 0.50 m

B) 0.05 M

C) 0.05 N

D) 0.05 m

Q: 50 cm³ of KOH solution was titrated against 1.0 M HCl using phenolphthalein as an indicator. The acid used was found to be 7.5 cm³. The concentration of KOH solution is: (ETEA 2005)

A) 0.15

B) 1.5

C) 0.75

D) None

Q: The lowering in vapour pressure is the highest for: (ETEA 2006)

A) 0.34 molal

B) 0.25 molal

C) 2 molal

D) 0.02 molal

Q: The 2% solution by weight of sodium chloride solution is prepared. The molality of this solution is: (ETEA 2007)

A) 0.34 molal

B) 0.25 molal

C) 2 molal

D) 0.02 molal

Q: 50.0 ml of 3.50 M H₂SO₄ must be diluted in order to make 2 M H₂SO₄. The required volume is: (ETEA 2008)

A) 25

B) 60.1

C) 87.5

D) 93.2

Q: 10 ml of 1.5 M NaOH solution is neutralized by 20 ml of a M HCl solution. The value of M HCl will be: (ETEA 2010)

A) 1.0

B) 0.75

C) 0.5

D) 0.25

Q: 2.3 g of ethanol (C₂H₅OH) is added to 500 g of water. Determine the molality of the resulting solution: (ETEA 2010)

A) 0.01 molal

B) 0.1 molal

C) 1.1 molal

D) 1.0 molal

Q: Water has a vapour pressure of 23.75 torr at 25°C. What is the vapour pressure of solution sucrose if its mole fraction is 0.25? (ETEA 2010)

A) 15.2 torr

B) 17.8 torr

C) 23.8 torr

D) 29.7 torr