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Chemistry: CUET Mock Test - 10 - CUET MCQ


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Chemistry: CUET Mock Test - 10 - Question 1

What is the direction of flow of electrons in an electrolytic cell?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 1

An electrolytic cell is a type of electrochemical cell. An electrolytic cell converts electrical energy into chemical energy. Electrons flow from anode to cathode through the external supply in an electrolytic cell. In the solution, only ions flow and not the electrons.

Chemistry: CUET Mock Test - 10 - Question 2

The IUPAC name of the above coordination entity is

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

To name this compound according to IUPAC conventions, follow these guidelines:
List the ligands first, in alphabetical order. The ligands here are ammonia (ammine in naming coordination entities) and chloride.
After the ligands, name the metal itself. The oxidation state of the metal is indicated in Roman numerals in parentheses right after the name of the metal.
The name ends with the counter ion(s) outside the coordination sphere.
Given this compound, the central metal is cobalt (Co), and it is coordinated to five ammine ligands ((NH3)) and one chloride ligand (Cl).
To determine the oxidation state of cobalt, consider that ammonia is a neutral ligand and does not contribute to the charge, while chloride is -1. The complex ion has a net charge of -1 (because there are two chloride ions outside the coordination sphere bringing the total charge to -2, and therefore, the charge of the coordination entity must be 2-1 = +1 to counterbalance the two external chloride ions to get a neutral compound):
[x + (0 x 5) + (-1) = +2]
[x - 1 = +2]
[x = +3]

[Co(NH3)5Cl]Cl2 : Pentaamminechloridocobalt (III) chloride

Chemistry: CUET Mock Test - 10 - Question 3

The spin only magnetic moment of the complex [Co(NH3)5Cl] Cl2 in BM is

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 3

Due to high charge density on Co3+ and the presence of a strong field ligand (NH3), electrons in d-orbitals will pair up so unpaired electron (n) will be zero.

∴ Spin only magnetic moment = BM

= 0

Chemistry: CUET Mock Test - 10 - Question 4

The hybridization of cobalt in the above coordination entity is

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 4

Due to high charge density on Co3+ and the presence of a strong field ligand (NH3), electrons in d-orbitals will pair up.
[Co(NH3)5Cl]Cl2 ⇒ Co3+ : [Ar]3d64s04p0

Chemistry: CUET Mock Test - 10 - Question 5

The coordination number of cobalt in the above coordination entity is

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 5

[Co(NH3)5Cl]Cl2
Coordination number = total number of donating sites = 5 + 1 = 6

Chemistry: CUET Mock Test - 10 - Question 6

The primary valence of Co in above coordination entity is

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 6

[Co(NH3)5Cl]Cl2 : x + 5(0) + 3(-1) = 0
⇒ x = +3 ⇒ Co3+
Primary valence = oxidation state of central metal = + 3

Chemistry: CUET Mock Test - 10 - Question 7

What is the standard potential E° of the cell

Zn | Zn2+ (IM) || I- (IM) | CuI | Cu of Eo Zn2+ | Zn = -0.76 V and Eo Cu+ | Cu = -0.17 V?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 7

Concept:

The standard potential E0 of a galvanic cell is referred to as the sum of the standard half cell potential for the oxidation and reduction half cells.

E0cell = E0 reduced - E0oxidised

Explanation:

For the cell,

Zn | Zn2+ (IM) || I- (IM) | CuI | Cu

Zn (s) Zn2+ (aq) + 2e- ⇒ E0ox = - 0.76v
Cu2+ (aq) + 2e- → Cu (s) ⇒ E0red = - 0.17V

The overall reaction is,
Zn(s) + Cu2+ (aq) → Zn2+ (aq) + Cu (s)
The standard potential E° of the cell,

E0cell = E0 copper -  E0 zinc
E0cell = -0.17 - (-0.76) = -0.17 + 0.76 = 0.59 V

Chemistry: CUET Mock Test - 10 - Question 8

When initial concentration of the reactant is doubled, the half-life period of a zero order reaction

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 8

Concept:

  • The order of a reaction is the summation of the powers of all the reactants which is expressed in the rate law.
  • The order of reaction can be 0,1,2, etc, and even fractional.
  • Zero order reaction is the reaction, where the rate of the reaction is proportional to the reactant to the power zero.
  • rate [A]0
  • The half-life refers to the time taken to reach its half concentration.
  • The mathematical relationship is as follows,
  • t 1/2 = [A0]/2K
  • Where A0 is the initial concentration of the reactant and K is the rate constant.

Explanation:

From question,

The half-life of zero order is

t 1/2 = [A0]/2K

 t 1/2will be doubled on doubling the initial concentration.

Hence, the correct option for the given question is, 2) Is doubled.

Chemistry: CUET Mock Test - 10 - Question 9

An endothemic reaction A → B has an activation energy 15 kcal/mole and energy of reaction 5 kcal/mole. The activation energy of the reaction B → A is

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

Activation energy-

  • Activation energy is defined as the minimum amount of extra energy required by a reacting molecule to get converted into a product.
  • It can also be described as the minimum amount of energy needed to activate or energize molecules or atoms so that they can undergo a chemical reaction or transformation.

Endothermic reaction-

  • Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
  • These reactions lower the temperature of their surrounding area, thereby creating a cooling effect. Physical processes can be endothermic as well – Ice cubes absorb heat energy from their surroundings and melt to form liquid water (no chemical bonds are broken or formed).

Given data and Calculation:
⇒ An endothermic reaction A → B has an activation energy of 15 kcal/mole and energy of reaction of 5 kcal/mole
For an endothermic reaction, the activation energy for the backward reaction is equal to the difference between the activation energy of the forward reaction and the enthalpy change of the reaction.

Thus, the activation energy of the reaction B → A is 15 − 5 = 10 kcal/mole

Chemistry: CUET Mock Test - 10 - Question 10

The molar conductance of NaCl, HCl and CH3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm2 mol−1 respectively. The molar conductance of CH3COOH at infinite dilution is. Choose the right option for your answer.

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

Concept:

Kohlrausch law of independent migration of ions :

→ The law states that limiting the molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte.

Thus, if λ ° Na + and λ ° Clare limiting molar conductivity of the sodium and chloride ions respectively, then the limiting molar conductivity for sodium chloride is given by the equation:

Λ ° m (NaCl) = λ ° Na + + λ ° Cl

Calculation:

Given,

Molar conductance of NaCl, HCl, and CH3COONa at infinite dilution are 126.45, 426.16, and 91.0 S cm2 mol−1

According to Kohlrausch's law of independent migration of ions.

Λm (CH3COOH)

ΛM (CH3 COONa) + ΛM (HCL) ΛM (NaCL)

= 91.0 S cm2 mol-1 + 426.16 S cm2 mol-1 - 126.45 S cm2 mol-1

= 390.71 S cm2 mol-1

Chemistry: CUET Mock Test - 10 - Question 11

In a dry cell, which of the following are used as electrolytes?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 11

The correct answer is Ammonium chloride and zinc chloride.
CONCEPT:

  • The dry cell is a type of battery used in electric devices.
  • As it uses electrolyte in the form of a paste, it can be used in portable devices.
  • The dry cell consists of a Zinc container which also acts as the anode and carbon (graphite) rod acts as the cathode surrounded by powdered Manganese dioxide, carbon and electrolyte ammonium chloride in the form of a paste.
  • Electrode reactions are :

At anode : Zn(s) → Zn2+ + 2e

At cathode : MnO2 + NH4 + + e¯ → MnO(OH) + NH3
EXPLANATION:

  • In a dry cell ammonium chloride and zinc chloride is used in the form of electrolytes
  • Ammonium chloride is mixed with Plaster of Paris to form a paste, with a small amount of zinc chloride added to increase the shelf life of the battery
  • Ammonium chloride paste allows current to flow.
  • Zinc chloride paste allows a dry-cell to conduct the electricity and provide electrical power to various substances.
Chemistry: CUET Mock Test - 10 - Question 12

Which of the following is not a characteristic feature of a salt bridge?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 12

A salt bridge is a junction that connects the anodic and cathodic compartments in a cell or electrolytic solution. It maintains electrical neutrality within the internal circuit, preventing the cell from rapidly running its reaction to equilibrium.

Chemistry: CUET Mock Test - 10 - Question 13

Which of the following factors does not affect the electrode potential of an electrode?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 13

Electrode potential is the tendency of an electrode to accept or to lose electrons. Electrode potential depends on the nature of the electrode, temperature of the solution and the concentration of metal ions in the solution. It doesn’t depend on the size of the electrode.

Chemistry: CUET Mock Test - 10 - Question 14

When equilibrium is reached inside the two half-cells of the electrochemical cells, what is the net voltage across the electrodes?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 14

A half-cell is half of an electrochemical cell (electrolytic or galvanic), where either oxidation or reduction occurs. At equilibrium, there is no transfer of electrons across the half cells. Therefore, the potential difference between them is nil.

Chemistry: CUET Mock Test - 10 - Question 15

Which of the following statements is correct?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 15

On association of solute molecules, the number of particles in a solution is reduced. Since, colligative properties are directly proportional to the number of particles in a solution, the colligative properties reduce. The molecular mass of the solute is inversely proportional to its colligative properties. Therefore, solutes that associate in water have a higher molar mass than its value calculated theoretically.

Chemistry: CUET Mock Test - 10 - Question 16

In which of the following solutions will the Van’t Hoff Factor for the solute be lesser than 1?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 16

The Van’t Hoff factor is less than 1 for solutes that dissociate in solution. In the given list, only sodium chloride dissociates in water whereas the remaining carboxylic acids associate in benzene. Hence, the value of the Van’t Hoff factor is lesser than 1 for a solution of sodium chloride in water.

Chemistry: CUET Mock Test - 10 - Question 17

The depression of freezing point of a solution of acetic acid in benzene is – 0.2°C. If the molality of acetic acid is 0.1 m, then find the ratio of the normal mass to the abnormal mass. (Assume Kf of acetic acid = 4.0°C m-1)

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 17

Given,
Depression in freezing point(ΔT) = -0.2 °C
Molality of the solution(m) = 0.1 m
Freezing point depression constant (Kf) = 4.0 °C m-1
Let the Van’t Hoff factor = i
We know that, ΔT = i x Kf x m
0.2 = i x 4 x 0.1
i = 0.2/0.4 = 0.5
Therefore, the ratio between the normal mass and abnormal mass, which is equal to the Van’t Hoff factor is equal to 0.5.

Chemistry: CUET Mock Test - 10 - Question 18

Which of the following aqueous solutions should have the least boiling point?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 18

KOH→K+ + OH
(NH4)2SO4→2NH4+ + SO42-
K2CO3→2K+ + CO32-
K2SO4→2K+ + SO42-
Concentration of particles in 1.0 M KOH solution is minimum (= 2 M). Hence, it will minimum elevation in boiling point.

Chemistry: CUET Mock Test - 10 - Question 19

Acetic acid associates as dimers in benzene. What is the Van’t Hoff factor (i) if the degree of association of acetic acid is 50%?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 19

Given,
Degree of association (α) = 50% = 0.5
Number of molecules associated (n) = 2
Let the Van’t Hoff factor = i
We know that for solutes that associate in solution, i = 1 + ((1/n) -1) x α
= 1 + ((1/2) – 1) x 0.5
= 1 – (0.5 x 0.5)
= 0.75
Therefore, the Van’t Hoff factor is equal to 0.75.

Chemistry: CUET Mock Test - 10 - Question 20

The pH of a 2 M solution of a weak monobasic acid (HA) is 4. What is the value of the Van’t Hoff factor?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 20

pH = 4 means [H+] = 10-4 M

Total = C (1+α)
Thus, [H+] = Cα, i.e., 10-4 = 2 x α or α = 5 x 10-5 = 0.00005
i = 1 + α = 1 + 0.00005 = 1.00005.

Chemistry: CUET Mock Test - 10 - Question 21

What is the Van’t Hoff Factor for 1 mole of BaCl2, assuming 100% dissociation?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 21

Van’t Hoff Factor can also be written as the ratio between the total number of moles of particles after association / dissociation and the total number of moles of particles before association / dissociation. Since BaCl2 completely dissociates(into one Ba2+ and two Cl- ions), the total number of moles after dissociation is equal to 3. Therefore, the Van’t Hoff Factor for BaCl2 is 3.

Chemistry: CUET Mock Test - 10 - Question 22

What is the value of the Van’t Hoff factor (i) for solutes that dissociate in water?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 22

Van’t Hoff’s factor (i) is defined as the ratio of the observed colligative property to the calculated colligative property. Since, the abnormal mass for solutes that dissociate is lesser than its normal molar mass, the value of Van’t Hoff’s factor will always be > 1.

Chemistry: CUET Mock Test - 10 - Question 23

What is defined as the concentration of dissolved solute in a solvent beyond which none of it, if added to the solvent, will increase the concentration further more?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 23

Solubility is the maximum amount of solute that can be dissolved in a given solvent at a particular temperature and pressure. It is usually expressed in grams of solute dissolved in 100 grams of the solvent. Any more solute added beyond this forms a supersaturated solution as none of the particles dissolve any more.

Chemistry: CUET Mock Test - 10 - Question 24

In a saturated solution with endothermic dissolution, how does the concentration of dissolved solute change with increasing then decreasing temperature?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 24

When a solution is saturated a thermodynamic equilibrium exists between the undissolved solute and dissolved solute. Since the dissolution process here is mentioned as endothermic increasing and decreasing temperatures will decrease and increase the concentration, respectively, as given by Le Chatelier’s Principle of equilibrium.

Chemistry: CUET Mock Test - 10 - Question 25

When CO2 is introduced into aerated drinks and sealed, what is the nature of the graph between partial pressure of CO2 and its concentration in the drink?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 25

CO2 obeys Henry’s law, which governs the solubility of gases in liquids in relation to its pressure. Henry’s law states that mole fraction of gas in the solution varies directly with its partial pressure over the surface i.e. p ∝ x (mole fraction). The graph is of the form y = mx, a positively sloped straight line passing through the origin.

Chemistry: CUET Mock Test - 10 - Question 26

Which of the following best describes the difficulty in breathing as one climbs to higher altitudes?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 26

Henry’s law states that the partial pressure of a gas in vapor phase varies directly with its mole fraction in the solution. At higher altitudes the partial pressure of O2 decreases hence the decrease in its concentration which causes difficulty in breathing.

Chemistry: CUET Mock Test - 10 - Question 27

What is the substance, present in a larger quantity that tends to establish homogenous bonds with a foreign substance, introduced in smaller quantity?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 27

A solution is made up of two parts, the solute and the solvent. Solvent is present in larger quantity which dissolves a solute. The process of dissolution involves formation of homogeneous bonds between the particles of solvent and solute. E.g. salt-water solution is made by dissolving salt, NaCl (solute) in water (solvent).

Chemistry: CUET Mock Test - 10 - Question 28

What is the solubility product expression for silver chromate dissolving in water?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 28

The formula for silver chromate is Ag2CrO4. On the other hand, silver dichromate is formulated as Ag2Cr2O7. If a compound is represented as AXBY then the solubility product expression is written in terms of its molar concentration as [A+]X [B]Y. Similarly, the solubility product expression for Ag2CrO4 is given as [Ag+]2 [CrO42-]2.

Chemistry: CUET Mock Test - 10 - Question 29

What characteristic of water accounts for its unique properties as a solvent?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 29

Water is a universal solvent. It has the ability to dissolve the greatest number of substances than any other solvent. The highly polar nature accounts for this special feature as the water molecule bears a slightly positively charged hydrogen ion and two highly negatively charged oxygen ions. Since, it becomes attracted to many different types of molecules it is known as the ‘universal solvent’.

Chemistry: CUET Mock Test - 10 - Question 30

Which of the following compound releases heat when dissolved in water?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 30

Out of the given options calcium chloride is the only salt which releases heat upon dissolving. Barium chloride and ammonium chloride undergo endothermic dissolution which decreases the temperature of water. However, lead chloride is an insoluble salt and does not dissolve.

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