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Free download in PDF Chemical Reaction Engineering Multiple Choice Questions(MCQs) & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
For the hydrolysis of methyl acetate in presence of acids
[A]
the order of reaction is 1 and molecularity is 2
[B]
the order of reaction is 2 and molecularity is 2
[C]
the order of reaction is 2 and molecularity is 1
[D]
the order of reaction is 1 and molecularity is 1
Answer: the order of reaction is 1 and molecularity is 2
(2)
The excess energy of the reactants required to dissociates into products is known as
[A]
activation energy
[B]
binding energy
[C]
threshold energy
[D]
thermal energy
Answer: activation energy
(3)
A reaction which proceeds with evolution of heat is called
[A]
thermo-nuclear reaction
[B]
endothermic reaction
[C]
exothermic reaction
[D]
photochemical reaction
Answer: exothermic reaction
(4)
A reaction which proceeds with absorption of heat is termed as
[A]
exothermic reaction
[B]
endothermic reaction
[C]
thermo-chemical reaction
[D]
photochemical reaction
Answer: endothermic reaction
(5)
Which of the following is a catalytic reaction?
[A]
Synthesis of water by passing electric sparks through a mixture of hydrogen and oxygen
[B]
Neutralization of a dilute alkali solution by a small amount of a conentrated acid
[C]
Hydrolysis of an ester in the presence of H+
[D]
Darkening of silver halides in light
Answer: Hydrolysis of an ester in the presence of H+
(6)
The formation of water from H2(g) and O2(g) is an exothermic reaction because
[A]
H2(g) and O2(g) have a higher chemical energy than water
[B]
H2(g) and O2(g) have a higher temperature than water
[C]
H2(g) and O2(g) have a lower chemical energy than water
[D]
energy considerations do not arise
Answer: H2(g) and O2(g) have a higher chemical energy than water
(7)
An exothermic reaction is that in which the reacting substances
[A]
have more energy than the products
[B]
have less energy than the products
[C]
have as much energy as the products
[D]
are at a higher temperature than the products
Answer: have more energy than the products
(8)
The reaction between organic material and oxygen is
[A]
an endothermic reaction
[B]
an exothermic reaction
[C]
a photochemical reaction
[D]
a biochemical reaction
Answer: an exothermic reaction
(9)
The rates of purely photochemical reactions do not depend on temperature to any significant extent because
[A]
they are exothermic reactions
[B]
they are endothermic reactions
[C]
the energy of the reacting molecules exceeds the activation energy by absorption of light
[D]
they are reversible reactions
Answer: the energy of the reacting molecules exceeds the activation energy by absorption of light
(10)
Plants manufacture carbohydrates from the carbon dioxide of the atmosphere by
[A]
oxidation
[B]
polymerization
[C]
condensation with water
[D]
a photochemical reaction
Answer: a photochemical reaction
(11)
A photochemical reaction is
[A]
catalysed by light
[B]
initiated by light
[C]
accompanied with emission of light
[D]
used to convert heat energy into light
Answer: initiated by light
(12)
Reaction between neutral solution of barium chloride and sodium carbonate goes to completion because
[A]
the reaction is irreversible
[B]
sodium chloride is only sparingly soluble in water
[C]
barium carbonate is almost insoluble in water
[D]
the solubility of BaCI2 decreases in the presence of sodium carbonate
Answer: barium carbonate is almost insoluble in water
(13)
The reaction CH2 = CH2 + Br2 ?? CH2 Br ?CH2Br is
[A]
a substitution reaction
[B]
an addition reaction
[C]
a molecular rearrangement
[D]
a photochemical reaction
Answer: an addition reaction
(14)
A chemical reaction occurs when the energy of the reacting molecules is
[A]
less than the activation energy of the reaction
[B]
equal to the activation energy of the reaction
[C]
more than the activation energy of the reaction
[D]
equal to or more than the activation energy of the reaction
Answer: equal to or more than the activation energy of the reaction
(15)
The symbolic representation of the molecule of a compound is called
[A]
structural formula
[B]
molecular formula
[C]
empirical formula
[D]
graphic formula
Answer: molecular formula
(16)
Chemical reactions involve the participation of
[A]
electrons
[B]
protons
[C]
neutrons
[D]
nuclei
(17)
When a correctly written chemical equation is balanced
[A]
the number of atoms of each kind on each side should be equal
[B]
all molecules are diatomic
[C]
all substances are in the same physical state
[D]
the sum of the coefficient on both sides is the same
Answer: the number of atoms of each kind on each side should be equal
(18)
An imbalanced equation is against the
[A]
law of gaseous volumes
[B]
law of constant proportions
[C]
law of conservation of mass
[D]
law of multiple proportions
Answer: law of conservation of mass
(19)
A balanced chemical equation is in accordance with
[A]
law of gaseous volumes
[B]
law of Avogadro
[C]
law of constant proportions
[D]
law of conservation of mass
Answer: law of conservation of mass
(20)
Which one of the following statements about a chemical equation is true?
[A]
Mass is conserved
[B]
Mass as well as atoms are conserved
[C]
Atoms are conserved
[D]
Ions are conserved
Answer: Mass as well as atoms are conserved
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