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Chemistry: CUET Mock Test - 9 - NEET MCQ


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40 Questions MCQ Test Chemistry Practice Tests: CUET Preparation - Chemistry: CUET Mock Test - 9

Chemistry: CUET Mock Test - 9 for NEET 2024 is part of Chemistry Practice Tests: CUET Preparation preparation. The Chemistry: CUET Mock Test - 9 questions and answers have been prepared according to the NEET exam syllabus.The Chemistry: CUET Mock Test - 9 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Chemistry: CUET Mock Test - 9 below.
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Chemistry: CUET Mock Test - 9 - Question 1

Which of the following is not a method to test the type of emulsion?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 1

Coagulation or precipitation is a process of aggregating together the colloidal particles to change them into large-sized particles which ultimately settle as a precipitate. The different methods to test the type of emulsion are-microscopic, conductance and dye method.

Chemistry: CUET Mock Test - 9 - Question 2

Which of the following is an example of an emulsifier?

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

To obtain a stable emulsion, sometimes, small quantities of certain other substances are added during its preparation. The substances thus added to stabilize the emulsions are called emulsifiers or emulsifying agents.

Chemistry: CUET Mock Test - 9 - Question 3

 What is the process called when the molecules of a substance are retained at the surface of a solid or a liquid?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 3

Adsorption is the process which involves the accumulation of the molecules of a substance in higher concentration on the surface of a solid or a liquid. For example, gasses are adsorbed on the surface of charcoal.

Chemistry: CUET Mock Test - 9 - Question 4

Which of the following can result in a transition from physisorption to chemisorption?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 4

Physisorption occurs due to Van der Waals forces. On increasing the temperature, the adsorbate can split into atoms and form chemical bonds with the adsorbent and hence, cause chemisorption.

Chemistry: CUET Mock Test - 9 - Question 5

Which of the following statements is true with respect to the types of adsorption?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 5

Chemisorption is stronger than physisorption. Chemisorption involves the forming of a chemical bond between the adsorbent and the adsorbate whereas in physisorption, the molecules are held together by weak Van der Waal’s forces. Therefore, chemisorption is stronger.

Chemistry: CUET Mock Test - 9 - Question 6

Which of the following statements is not true with respect to chemisorption?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 6

Chemisorption is a kind of adsorption that involves a chemical reaction between the adsorbent and adsorbate, resulting in the formation of a chemical bond between the two. Since a bond is to be formed, chemisorption is highly dependent on the reactants(adsorbate and adsorbent) and has a large heat of adsorption. Also, since it involves bond formation, it cannot be multi-layered. Chemisorption is favoured to occur at high temperature.

Chemistry: CUET Mock Test - 9 - Question 7

Which of the following is an example of sorption?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 7

Sorption refers to the process where adsorption and absorption occur at the same time. Cotton dipped in ink is one of the cases where both adsorption and absorption, that is, sorption occurs.

Chemistry: CUET Mock Test - 9 - Question 8

Which of the following statements is incorrect with respect to physisorption?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 8

Physisorption is reversible as the molecules of the adsorbate are held to the adsorbent by weak Van der Waals forces which can be broken easily. Physisorption is exothermic and so, ΔH is negative. Adsorption is a spontaneous process. In adsorption, the movement of the adsorbed molecule is restricted. As a result the entropy change (ΔS) is negative.

Chemistry: CUET Mock Test - 9 - Question 9

Which of the following statements is true with respect to the extent of physisorption?

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

Physisorption is an exothermic process. According to Le-Chatelier’s principle, an exothermic reaction is favoured by a decrease in temperature. Therefore, the extent of physisorption decreases on increasing temperature.

Chemistry: CUET Mock Test - 9 - Question 10

Which of the following forces is involved in physical adsorption?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 10

In physical adsorption, the molecules of the adsorbate stick to the surface of the adsorbent due to very weak forces which is known as Van der Waals force. Van der Waals force is similar to the forces that cause condensation of gas into liquid.

Chemistry: CUET Mock Test - 9 - Question 11

The rate constant of a reaction is k=3.28 × 10-4 s-1. Find the order of the reaction.

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 11

Given,
k = 3.28 × 10-4 s-1
The general formula to find the units for rate constant, k = (mol L-1)1-ns-1 where n is the order of the reaction. The value of n must be 1 for (mol L-1)1-ns-1 to become s-1.
Therefore,k = 3.28 × 10-4s-1 represents a first order reaction.

Chemistry: CUET Mock Test - 9 - Question 12

What is the concentration of the reactant in a first order reaction when the rate of the reaction is 0.6 s-1 and the rate constant is 0.035?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 12

Given, R=0.6 s-1 and k= 0.035
For a first order reaction R= k [A]

Chemistry: CUET Mock Test - 9 - Question 13

What is the rate law for acid hydrolysis of an ester such as CH3COOC2H5 in aqueous solution?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 13

Acid hydrolysis of ester, CH3COOC2H5 + H2O → CH3COOH + C2H5OH
The order of the reaction may be altered sometimes by taking reactant in excess compared to the other.
The rate law R= k [CH3COOC2H5] [H2O] however water is present in excess.
So, R= k [CH3COOC2H5].

Chemistry: CUET Mock Test - 9 - Question 14

For the reaction A + H2O → products, find the rate of the reaction when [A] = 0.75 M, k= 0.02.

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 14

Given,
[A] = 0.75 M, k= 0.02
The reaction belongs to pseudo first order reaction so, the unit is s-1
R= k [A]= 0.02 × 0.75= 0.015 s-1.

Chemistry: CUET Mock Test - 9 - Question 15

For a reaction A +B → C, the experimental rate law is found to be R=k[A]1[B]1/2. Find the rate of the reaction when [A] = 0.5 M, [B] = 0.1 M and k=0.03.

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 15

Given, [A] = 0.5 M, [B] = 0.1 M and k= 0.03
From the rate law it is evident that the order of the reaction is 1+ 0.5 = 1.5 = 32
Therefore the unit of k= (mol L-1)1-1.5 s-1 = (L/mol)1/2 s-1
R= k[A]1[B]1/2 = 0.03 × 0.5 × 0.11/2 = 4.74 × 10-2(L/mol)1/2 s-1.

Chemistry: CUET Mock Test - 9 - Question 16

How many times will the rate of the elementary reaction 3X + Y → X2Y change if the concentration of the substance X is doubled and that of Y is halved?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 16

Since it is an elementary reaction, its rate law r1= k [A] 3[B]
When the concentrations are changed the new rate will be r2= k (2[A])3([B]/2) = 4k[A]3[B]
So, r2 = 4r1.

Chemistry: CUET Mock Test - 9 - Question 17

What is the rate law for the reaction C2H4 + I2 → C2H4I2?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 17

Fractional order reactions are reaction whose order is a fraction. This reaction is an example of fractional order reaction, where the order of the reaction is 5/2.
The rate law for the reaction is known to be R= [C2H4] [I2]3/2.

Chemistry: CUET Mock Test - 9 - Question 18

What is the method of protection of iron by coating it with zinc called?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 18

Rusting of iron is one of the most common forms of corrosion. To prevent iron from rusting, generally, more active metals are coated on it. The metal which is often used for coating iron is zinc (which is more active) and this process is called galvanization.

Chemistry: CUET Mock Test - 9 - Question 19

Which of the following is not a method of prevention of corrosion?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 19

Galvanization is the process of coating iron with zinc to prevent its oxidation. Anti-rust solutions are alkaline phosphate and alkaline chromate solutions. The alkalinity prevents the availability of hydrogen ions. Cathodic protection is the process of connecting the iron object to be protected to a more active metal either directly or through a wire.

Chemistry: CUET Mock Test - 9 - Question 20

Which of the following is not essential for rusting to take place?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 20

Rust is a general term for a series of iron oxides, usually, reddish-brown oxides, formed by the reaction of iron with oxygen in the presence of water or moisture. Water is usually present in the form of water vapour and oxygen is always present in the normal atmosphere. The oxygen needs moisture as a catalyst and reactant to accelerate the reaction, so in the absence of moisture, iron won’t rust.

Chemistry: CUET Mock Test - 9 - Question 21

Which of the following metal does not corrode?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 21

Magnesium and zinc are highly active. Hence, they corrode at a faster rate than iron. Iron undergoes rusting in the presence of oxygen and moisture. Copper, a noble metal that occurs naturally in its elemental form, is almost totally impervious to corrosion.

Chemistry: CUET Mock Test - 9 - Question 22

Which of the following statements is false?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 22

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 - 9 - Question 23

Which of the following does not cause rusting of iron?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 23

Air and moisture accelerate corrosion. The most important factor in atmospheric corrosion, overriding pollution or lack of it, is moisture. Presence of gases like SO2 and CO2 in air catalyse the process of corrosion. Iron, when placed in vacuum, does not rust.

Chemistry: CUET Mock Test - 9 - Question 24

Which of the following statements regarding corrosion is true?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 24

More active metals are readily corroded. Presence of impurities in metals enhances the chances of corrosion. Pure metals do not corrode. Corrosion takes place rapidly at bends, scratches, nicks and cuts in the metal. Electrolytes, if present, also increase the rate of corrosion.

Chemistry: CUET Mock Test - 9 - Question 25

Which of the following is the overall reaction of rusting?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 25

2Fe(s) → 2Fe2+ + 4e is the reaction that occurs at the anode.
O2 (g) + 4H+(aq) + 4e⟶2H2O(l) is the reaction that occurs at the cathode.
2Fe(s) + O2(g) + 4H+(aq) → 2Fe2+(aq) + 2H2O(l) is the overall reaction of rusting.

Chemistry: CUET Mock Test - 9 - Question 26

What is the composition of aqua regia?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 26

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 - 9 - Question 27

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

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 27

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 - 9 - Question 28

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

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 28

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 - 9 - Question 29

What is the electrolyte used in the electroplating of gold?

Detailed Solution for Chemistry: CUET Mock Test - 9 - 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 - 9 - Question 30

What are the two electrodes used in Daniell cell?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 30

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 - 9 - Question 31

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

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 31

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 - 9 - Question 32

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

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 32

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 - 9 - Question 33

 An electrochemical cell generally consists of a cathode and an anode. Which of the following statements is correct with respect to the cathode?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 33

Cathodes are usually metal electrodes. It is the electrode where reduction takes place. The cathode is the positive electrode in a galvanic cell and a negative electrode in an electrolytic cell. Electrons move into the cathode.

Chemistry: CUET Mock Test - 9 - Question 34

Which of the following is not a generally used electrolyte in the salt bridges used to connect the two half-cells of an electrochemical cell?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 34

A salt bridge is a device used to connect the oxidation and reduction half-cells of a galvanic cell (a type of electrochemical cell). Strong electrolytes are generally used to make the salt bridges in electrochemical cells. Since ZnSO4 is not a strong electrolyte, it is not used to make salt bridges.

Chemistry: CUET Mock Test - 9 - Question 35

Which of the following statements is correct regarding Electrochemical cells?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 35

Cell potential is an intensive property as it is independent of the amount of material present. Gibbs free energy is defined for an electrochemical cell and is an extensive property as it depends on the quantity of the material.

Chemistry: CUET Mock Test - 9 - Question 36

Why are the saturated solutions of electrolytes for the salt bridge prepared in agar-agar jelly or gelatin?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 36

The salt bridge connects the two half-cell solutions to complete the circuit of the electrochemical cell. The electrolytes of the salt bridge are generally prepared in agar-agar or gelatin so that the electrolytes are kept in a semi-solid phase and do not mix with the half-cell solutions and interfere with the electrochemical reaction.

Chemistry: CUET Mock Test - 9 - Question 37

Which of the following is not a type of electrochemical cell?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 37

A Voltaic or Galvanic cell is a type of electrochemical cell that converts chemical energy into electrical energy. Photovoltaic cells are used to convert light energy into electrical energy. An Electrolytic cell is a type of electrochemical cell that converts electrical energy into chemical energy. A fuel cell is an electrochemical cell that converts the chemical energy of a fuel and an oxidizing agent into electricity.

Chemistry: CUET Mock Test - 9 - Question 38

Which of the following is a not a secondary cell?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 38

A secondary battery (a series of cells) is one which can be charged, discharged into a load, and recharged many times. Nickel-cadmium cell, Lead storage cell and Mercury cell are examples of secondary cells. Leclanche cell is an example of a primary cell.

Chemistry: CUET Mock Test - 9 - Question 39

What is the observation when the opposing external applied potential to an electrochemical cell is greater than the cell’s potential?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 39

In an electrochemical cell, when an opposing externally potential is applied and increased slowly, the reaction continues to take place. When the external potential is equal to the potential of the cell, the reaction stops. Once the externally applied potential is greater than the potential of the cell, the reaction goes in the opposite direction and the cell behaves like an electrolytic cell.

Chemistry: CUET Mock Test - 9 - Question 40

Which of the following statements regarding primary cells is false?

Detailed Solution for Chemistry: CUET Mock Test - 9 - Question 40

Primary cells cannot be used again and again. Since there is no fluid inside, these cells are also known as dry cells. The internal resistance is high and the chemical reaction is irreversible. Their initial cost is cheap.

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