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Chemistry: CUET Mock Test - 2 - NEET MCQ


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40 Questions MCQ Test Chemistry Practice Tests: CUET Preparation - Chemistry: CUET Mock Test - 2

Chemistry: CUET Mock Test - 2 for NEET 2024 is part of Chemistry Practice Tests: CUET Preparation preparation. The Chemistry: CUET Mock Test - 2 questions and answers have been prepared according to the NEET exam syllabus.The Chemistry: CUET Mock Test - 2 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Chemistry: CUET Mock Test - 2 below.
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Chemistry: CUET Mock Test - 2 - Question 1

_________ is the basic repeated structural unit of a crystalline solid.

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 1

Crystalline solids are composed of many small crystals, each of which is called a unit cell. It is a specific term. Monomer is the basic unit for a polymer, and atoms make up molecules, which can further arrange themselves to form solids, liquids or gases.

Chemistry: CUET Mock Test - 2 - Question 2

The rate constant of a reaction is 0.01s-1, how much time does it take for 2.4 mol L-1 concentration of reactant reduced to 0.3 mol L-1?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 2

Given,
K = 0.01s-1
t1/2 = 0.693/0.01
t1/2 = 69.3s
[R] = [R]0/2n
2n = [R]0/[R]
2n = 2.4/0.3
2n = 8
n = 3 (number of half-lives)
For 1 half-life t1/2 = 69.3s
For 3 half-life 3t1/2 = 3 x 69.3s = 207.9s.

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Chemistry: CUET Mock Test - 2 - Question 3

Sulfur exists in two polymorphic forms ________ and ________

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 3

There are two polymorphous structures of sulfur, rhombic and monoclinic. Polymorphous structures occur when a single substance can crystallize in two or more forms depending upon the conditions.

Chemistry: CUET Mock Test - 2 - Question 4

When a single substance can crystallize in two or more forms under different conditions provided, it is called as _________

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 4

Isomorphous is when two or more substances have the same crystal structure. Polymorphous is when a single substance can crystallize in two or more forms depending upon the conditions.

Chemistry: CUET Mock Test - 2 - Question 5

What is the composition of aqua regia?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 5

Aqua regia also known as royal water is a yellow-orange mixture of concentrated nitric acid and hydrochloric acid in the ratio 1:3. It is used by an alchemist to dissolve noble metals like gold and silver.

Chemistry: CUET Mock Test - 2 - Question 6

What time does it take for reactants to reduce to 3/4 of initial concentration if the rate constant is 7.5 x 10-3 s-1?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 6

Given,
K = 7.5 x 10-3 s-1
K = (2.303/t) x log([R]0/[R])
t = (2.303/7.5 x 10-3) x log([100]/[25])
t = (2.303/7.5 x 10-3) x 0.6
t = 38.4s.

Chemistry: CUET Mock Test - 2 - Question 7

Which of the following is the correct expression for the temperature coefficient (n)?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 7

The effect of temperature on the rate of a reaction is usually expressed in terms of the temperature coefficient which is defined by the equation:
Temperature coefficient (n) = Rate constant at T + 10° (308 K)/Rate constant at T° (298 K).

Chemistry: CUET Mock Test - 2 - Question 8

Which of the following is not an example of lyophilic colloids?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 8

Starch solution, gelatin and gum are colloids in which the dispersed phase has very high affinity for the dispersion medium and therefore they are categorized as lyophilic colloids. Silver solution on the other hand is an example of lyophobic colloids.

Chemistry: CUET Mock Test - 2 - Question 9

What is the preferred electrode when it is not allowed to take part in the chemical reaction?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 9

Electrodes which do not take part in the chemical reaction during electrolysis are known as inert electrodes. Gold, silver and graphite do not take part in the process, but graphite is preferred because gold and silver electrodes are expensive.

Chemistry: CUET Mock Test - 2 - Question 10

A zero-order reaction is 25% complete in 30seconds. What time does it take for 50% completion?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 10

t25% = (1-0.75)/K
K = 0.25/30
t50% = (1 x 30)/(2 x 0.25)
t50% = 15/0.25
t50% = 60s.

Chemistry: CUET Mock Test - 2 - Question 11

Solid-state is denser than the liquid and gaseous states of the same substance. Which of the following is an exception to this rule?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 11

The density of ice is about 0.92 g/cm3 while that of water is 1 g/cm3. Mercury has density 14.184 g/cm3 as solid and 13.69 g/cm3 as liquid. Carbon dioxide has density 1.56 g/cm3 as solid and 1.10 g/cm3 as liquid. NaCl has density 2.71 g/cm3 as solid and 1.556 g/cm3 in molten state. Therefore only ice has lesser density as a solid than as a liquid.

Chemistry: CUET Mock Test - 2 - Question 12

Which of the following is not an example of lyophobic colloids?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 12

Gold solution, Sulphur solution and blood are colloids in which the dispersed phase has very low affinity for the dispersion medium and once the dispersed phase and dispersion medium are separated we cannot get the solution directly by remixing the two phases. Therefore they are categorized under lyophobic colloids.

Chemistry: CUET Mock Test - 2 - Question 13

What is the product formed at the cathode in the electrolysis of molten NaCl?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 13

In the electrolysis of NaCl, if the electrolyte is molten NaCl, then the only ions formed after dissociation are Na+ and Cl ions. The cathode being a negatively charged electrode attracts the positive Na+ ions and neutralizes it to form Sodium metal.

Chemistry: CUET Mock Test - 2 - Question 14

What is the integrated rate equation for a first order reaction?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 14

A reaction is said to be of the first order if the rate of the reaction depends upon one concentration term only. The integrated rate equation for a first order reaction in exponential form is [A] = [A]0e-kt.

Chemistry: CUET Mock Test - 2 - Question 15

What happens to the peak of the curve in the Maxwell-Boltzmann distribution graph if temperature increases?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 15

With the increase of temperature, the peak shifts forward but downward. This is because with the increase of temperature, the most probable kinetic energy increases and the fraction of molecules possessing most probable kinetic energy decreases.

Chemistry: CUET Mock Test - 2 - Question 16

In ______ constituent particles are closely packed leaving the least amount of vacant spaces.

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 16

In solids, the constituent particles tend to be closely packed due to strong forces between them. Hence, solids are stable and have a definite shape.

Chemistry: CUET Mock Test - 2 - Question 17

What is the product formed at the cathode in the electrolysis of aqueous Na2SO4?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 17

Na2SO4 dissociates into Na+ and SO42- ions in the electrolysis of aqueous Na2SO4. Na+ has much lower reduction potential than water and hence Na+ ions are not reduced at the cathode. Instead, reduction of water occurs giving out hydrogen gas at the cathode.

Chemistry: CUET Mock Test - 2 - Question 18

For a certain reaction the values of Arrhenius factor and Activation energy are 4 x 1013 collision/sec and 98.6KJ/mol at 303K. Calculate the rate constant if reaction is 1st order?( R = 8.341mol-1K-1)

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 18

Arrhenius factor(A) = 4 x 1013 collisions/sec
Activation energy (Ea)=98.6KJ/mol=98.6 x 103J/mol, T=303 K
log K = log A – (Ea/2.303RT)
log K = log (4 x 1013) – (98.6 x 103)/(2.303 x 8.314 x 303)
log K = 13.6020 – (98.6 x 103/5801.584)
log k = -3.39
K = 10-3.39
K = 4.07 x 10-4.

Chemistry: CUET Mock Test - 2 - Question 19

Which of the following is the correct Arrhenius equation?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 19

Quantitatively, the effect of temperature on the rate of a reaction and hence on the rate constant k, was proposed by Arrhenius in 1889. The equation, called Arrhenius equation, is usually written in the form k = A e-Ea/RT.

Chemistry: CUET Mock Test - 2 - Question 20

Which of the following is a characteristic of a multi-molecular colloid?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 20

In this type of colloidal solution, a large number of atoms or small molecules aggregate to form a particle of colloidal size, these are normally of lyophobic type. Starch solution is an example of lyophilic colloids and hence is not an example for multi-molecular colloids.

Chemistry: CUET Mock Test - 2 - Question 21

What is the product formed at the cathode in the electrolysis of aqueous CuSO4?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 21

In the electrolysis of aqueous CuSO4, Cu2+, SO42+, H+ and OH are the ions formed after dissociation. Copper ions have much higher reduction potential than water. Hence, these ions are easily reduced and deposited as Cu at the cathode.

Chemistry: CUET Mock Test - 2 - Question 22

The decomposition of N2O5 in CCl4 solution was studied. N2O5 → 2NO2 + 1/2O2. The rate constant of the reaction is 6.2 x 10-4 sec-1. Calculate the rate when the concentration of N2O5 is 1.25 molar.

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 22

Given,
N2O5 → 2NO2 + 1/2 O2
Rate = k[N2O5] 1
Rate = 6.25 x 10-4 x [1.25]
Rate = 7.75 x 10-4.

Chemistry: CUET Mock Test - 2 - Question 23

Which of the following represents the Boltzmann factor?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 23

The factor e-Ea/RT in the Arrhenius equation is called Boltzmann factor. It represents the fraction of the molecules (NE/NT) having energy equal to or greater than E where NE represents the number of molecules with energy E and NT represents the total number of molecules.

Chemistry: CUET Mock Test - 2 - Question 24

Which of the following is false regarding macro-molecular colloids?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 24

Macro-molecules dissolve in a suitable solvents, gives rise to particles of colloidal size. These are normally of lyophilic type and silver solution is an example for lyophobic and multi-molecular colloids.

Chemistry: CUET Mock Test - 2 - Question 25

Which of the following statements is true for an amorphous solid?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 25

For an amorphous solid there is short range order present which is independent of the temperature. Long range order is present in crystalline solids.

Chemistry: CUET Mock Test - 2 - Question 26

What is the formula to calculate the time taken for the completion of a zero-order reaction?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 26

The time taken for the zero-order reaction to complete can be calculated as follows:
When the reaction is complete, [A]0 = 0
Therefore, k = [A]0/t or t100% = [A]0/k.

Chemistry: CUET Mock Test - 2 - Question 27

What is R in the equation k = Ae-Ea/RT?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 27

Saline medium has extra salts such as sodium chloride dissolved in water. It has a greater concentration of electrolyte than ordinary medium. The ions present will favour the formation of more electrochemical cells and favour the transfer of hydrogen ions and will thus promote rusting or corrosion.

Chemistry: CUET Mock Test - 2 - Question 28

Which of the following is not an example of associated colloids?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 28

Some substances at low concentration behave as true solutions. As the concentration of the solution increases, it turns to be a colloidal solution. These type of colloids are knows as associated solution. Soaps like sodium stearate potassium stearate and detergents are examples of associated colloids whereas gum is an example for lyophilic colloids.

Chemistry: CUET Mock Test - 2 - Question 29

What is the electrolyte used in the electroplating of gold?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 29

The electrolyte in electrolysis should contain the metal to be coated, gold in this case. AuCN is used because it is exceptionally stable and doesn’t resist the flow of Au+ ions from anode to cathode.

Chemistry: CUET Mock Test - 2 - Question 30

In how many ways, can the two-dimensional close packed structure be generated?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 30

Two-dimensional close packed structure can be generated using the one-dimensional close packed structures. This can be done in 2 ways:

  • By placing one row of one-dimensional structure below another in such a way that the spheres are one below the another.
  • By placing one row of one-dimensional structure below another such that spheres of second row fit in the depressions of the first row.
Chemistry: CUET Mock Test - 2 - Question 31

The activation energy of a reaction is 50 kJ mol-1 and the value of rate constant at 300 K is 2.5 × 10-5 sec-1. What is the value of the frequency factor, A?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 31

Given,
Ea = 50 kJ mol-1
T = 300 K
k = 1.5 × 10-5 sec-1
R = 8.314 J K-1 mol-1
log k = – Ea / (2.303 RT) + log A
OR
log A = log k + Ea / (2.303 RT)
log A = log (1.5 × 10-5) + 50000 / (2.303 × 8.314 × 300)
log A = 3.88061
A = antilog (3.880611)
A = 7596.45 s-1.

Chemistry: CUET Mock Test - 2 - Question 32

Which of the following colloids cannot be formed by direct mixing?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 32

Lyophobic colloids such as metal solutions like gold and silver solution, sulphur solution and blood cannot be prepared directly by mixing. These are prepared by special methods and are irreversible in nature. Once the dispersed phase and medium are separated it is not possible to get the solution by remixing the two phases.

Chemistry: CUET Mock Test - 2 - Question 33

What are the two electrodes used in Daniell cell?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 33

The two electrodes that are used in a Daniell cell are zinc (as anode) and copper (as cathode) electrodes which are dipped in a solution containing its own ions, generally zinc sulphate and copper sulphate.

Chemistry: CUET Mock Test - 2 - Question 34

Which of the following describes a general solid?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 34

The intermolecular forces of attraction in a solid are very strong, making it incompressible. Gases are highly compressible, while liquids are semi-compressible. Fluid is a property of a substance that can ‘flow’.

Chemistry: CUET Mock Test - 2 - Question 35

What is the value of rate constant k if the value of the activation energy Ea and the frequency factor A are 49 kJ / mol and 9 × 1010 s-1 respectively? (T = 313 K)

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 35

Ea = 49 kJ / mol-1
T = 313 K
A = 9 × 102 s-1
R = 8.314 J K-1 mol-1
log k = – Ea / (2.303 RT) + log A
log k = – 49000 / (2.303 × 8.314 × 313) + log 9 × 1010
log k = 2.77843
k = antilog (2.77843)
k = 6 × 102 s-1.

Chemistry: CUET Mock Test - 2 - Question 36

Which of the following colloids is most stable?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 36

Starch solution is most stable among the following because it is a lyophilic colloid and the solutions are highly stable due to the high interaction between the dispersed phase and the dispersion medium.

Chemistry: CUET Mock Test - 2 - Question 37

What is the coordination number for a two-dimensional hexagonal close packed structure?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 37

In a two-dimensional hexagonal close packed structure, each sphere is in direct contact with 6 of its adjacent spheres. Hence, it has coordination number 6.

Chemistry: CUET Mock Test - 2 - Question 38

The half-life of a given reaction is doubled if the initial concentration of the reactant is doubled. What is the order of the reaction?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 38

Half-life (t1⁄2) is the time required for a quantity to reduce to half of its initial value. The half-life of a zero-order reaction is directly proportional to its initial concentration. They are related as: t1/2 = [R]0/2k.

Chemistry: CUET Mock Test - 2 - Question 39

A first-order reaction is 50 percent complete in 30 minutes. Calculate the time taken for completion of 87.5 percent of the reaction.

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 39

Reaction is 50 percent complete in 30 minutes. Hence, t1/2 = 30 minutes
75 percent of the reaction is completed in two half-lives. Hence, t = 2 × 30 = 60 minutes
87.5 percent of the reaction is completed in three half-lives. Hence, t = 3 × 30 = 90 minutes.

Chemistry: CUET Mock Test - 2 - Question 40

In which of the following, the dispersed phase and medium can be separated by evaporation?

Detailed Solution for Chemistry: CUET Mock Test - 2 - Question 40

In starch solution, if the dispersed phase and the dispersion medium are separated by evaporation, the colloidal solution can be regained by remixing the dispersed phase and dispersion medium. Hence these are called reversible solutions are highly stable because of the high interaction between the dispersed phase and medium.

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