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Chemistry: CUET Mock Test - 10 - NEET MCQ


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40 Questions MCQ Test Chemistry Practice Tests: CUET Preparation - Chemistry: CUET Mock Test - 10

Chemistry: CUET Mock Test - 10 for NEET 2024 is part of Chemistry Practice Tests: CUET Preparation preparation. The Chemistry: CUET Mock Test - 10 questions and answers have been prepared according to the NEET exam syllabus.The Chemistry: CUET Mock Test - 10 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Chemistry: CUET Mock Test - 10 below.
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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

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

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

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 3

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

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

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 4

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 4

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 5

Which of the following statements is correct?

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

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 6

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 6

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 7

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 7

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 8

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

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

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 9

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 9

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 10

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 10

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 11

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

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

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 12

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 12

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 13

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 13

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 14

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 14

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 15

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 15

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 16

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 16

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 17

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 17

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 18

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

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

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 19

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

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

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 20

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

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

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.

Chemistry: CUET Mock Test - 10 - Question 21

What is the molar solubility product for V3(PO4)5 in terms of KSP?

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

The dissociation reaction is represented as V3(PO4)5 → 3V5+ + 5PO43-
If S is the solubility of V5+ and PO43- ions then KSP = [3V5+]3 [5PO43-]5, where the square brackets indicate the molar concentrations of the ions in the solution. KSP can then be written as KSP = [3S] 3[5S] 5 = 33 x 55 x S8 gives KSP= 84375 x S8.
Therefore, on rearranging, S = (KSP/84375)1/8.

Chemistry: CUET Mock Test - 10 - Question 22

At NTP, the solubility of natural gas in water is 0.8 mole of gas/kg of water. What is the Henry’s law constant for natural gas?

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

Given,
Solubility of natural gas, S = 0.8 mole of gas/kg of water = 0.8 molal
Hence, moles of natural gas in mixture, nNG = 0.8 mole
At NTP, pressure, PNG = 1.01325 bar
Number of moles of water in 1000 g, nw = mass/molar mass
nw = 1000g / (18g/mole) = 55.56 mole
Mole fraction of natural gas in the mixture, XNG = nNG/ (nNG + nw)
XNG = 0.8/(0.8 + 55.56) = 0.0142
Using Henry’s law PNG = KH x XNG
KH = PNG/XNG = 1.01325 bar/0.0142 = 71.36 bar.

Chemistry: CUET Mock Test - 10 - Question 23

What is the concentration of N2 in a fresh water stream in equilibrium with air at 298 K and 1 atmosphere? Given the value of KH for N2 = 0.00060 mole/kgbar.

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

Given,
KH = 0.00060 mole/kgbar
PN2 = mole fraction of N2 x Pair (from Dalton’s law)
Air consists of 79 mole% N2 and 21 mole% O2.
PN2 = 0.79 x 1 bar= 0.79 bar
Henry’s law –PN2x KH= solubility of N2
0.79 bar x 0.00060 (mole/kgbar) = solubility of N2
Solubility of N2 = 4.74 x 10-4 moles of N2/kg water
Converting moles of N2 to kg of N2 :
Solubility of N2 = 4.74 x 10-4 mole x 28 kg/mole = 0.0133 kg N2/kg water = 13.3 g N2/kg water.

Chemistry: CUET Mock Test - 10 - Question 24

If, at 298 K water is the solvent, and Henry’s law constant for CO2 is 1.67 kbar and the constant of argon is 40.3 kbar, which of the following statements is true?

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

Henry’s law is formulated asp = KH x X (mole fraction). From this, it is seen that as KH increases, mole fraction decreases in order to compensate the increase in partial pressure of the gas. Hence, higher the KH value lower is the solubility. Therefore, argon is less soluble in water than CO2 at 298 K.

Chemistry: CUET Mock Test - 10 - Question 25

How does the solubility of gas change in a liquid, as described?

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

In an equilibrium system of gas dissolved in solvent, when pressure over it is increased more and more gas particles are forced into a smaller volume. This also increases the rate at which they strike the surface of the solvent to enter it. Consequently, more gas dissolves with increasing pressure. In the case of increasing temperature, gas particles gain sufficient energy to escape the solvent and solubility decreases.

Chemistry: CUET Mock Test - 10 - Question 26

Which of the following solvents would most likely dissolve 3-Aminopropan-1-ol?

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

The principle of solubility states that ‘like dissolves like’. Following this, it is seen that 3-Aminopropan-1-ol is a highly polar compound since it bears an amine group as well as a hydroxyl group. The polarity of amine group is due to the highly electronegative nature of N atom in N – H and C – N bonds. Since water is the most polar solvent amongst the four, it will dissolve the solute to greatest extent.

Chemistry: CUET Mock Test - 10 - Question 27

Which of the following is not a trade name of PMMA polymer?

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

PMMA is a polymer of methyl methacrylate. It is used in the manufacturing of lenses, dentures, aircrafts windows, etc. It is known by the commercial names plexiglass, lucite, acrylite, perspex and crylux. Vectran is an aromatic polyester.

Chemistry: CUET Mock Test - 10 - Question 28

Which of the following is used in the making of unbreakable cups?

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

Urea formaldehyde is a thermosetting resin polymer produced by the condensation of urea and methanal. It is used in making unbreakable cups and laminated sheets.

Chemistry: CUET Mock Test - 10 - Question 29

Which of the following is used in the firewall of vehicles?

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

Nomex is a highly fire-resistant meta-aramid polymer that is rigid and durable. Its monomers are m-phenylenediamine and isophthaloyl chloride. It is commonly used in firefighting equipment and in the driving apparel of racers to protect them in the case of a fire.

Chemistry: CUET Mock Test - 10 - Question 30

Which of the following is used in the manufacture of building materials?

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

Glyptal is a copolymer of ethylene glycol and phthalic acid. It is an important component in the manufacturing of paints, lacquers and building materials.

Chemistry: CUET Mock Test - 10 - Question 31

When a soap is dissolved in ethanol followed by the evaporation of excess solvent, what type of soap is formed?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 31

When the soap is dissolved in a solution of ethanol while making it and then evaporating the excess ethanol not used in the process, a transparent soap is formed.

Chemistry: CUET Mock Test - 10 - Question 32

Dishwashing liquids are examples of ______

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 32

Dishwashing liquids are non-ionic detergents. They may be prepared from the reaction of polyethylene glycol with stearic acid. These do not contain any ionic entities in their whole chain.

Chemistry: CUET Mock Test - 10 - Question 33

What is the use of trisodium phosphate in soap powders?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 33

Sodium carbonate and trisodium phosphate acts a builders or building agents in powder soaps. These make the soap act more rapidly.

Chemistry: CUET Mock Test - 10 - Question 34

Which of the following causes soap to lather?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 34

Rosin is a chemical compound which is a gum that is added while making soaps. During saponification, it forms sodium rosinate which forms lathers.

Chemistry: CUET Mock Test - 10 - Question 35

Identify the cationic detergent from the following.

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 35

Cetyltrimethylammonium bromide is a quaternary salt cation with bromine as the anion. The cationic part participates in the cleansing mechanism. Pentaerythritol monostearate is a non-ionic detergent, whereas sodium dodecyl sulphate and sodium lauryl sulphate are anionic detergents.

Chemistry: CUET Mock Test - 10 - Question 36

What happens to the atomic size of the lanthanides with increase in atomic number?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 36

The gradual decrease in the atomic and ionic radii of the lanthanides with an increase in atomic number is called lanthanide contraction. It occurs due to the poor shielding effect of the 4f electrons.

Chemistry: CUET Mock Test - 10 - Question 37

What is the most common oxidation state of lanthanides?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 37

The most common and stable oxidation state of lanthanides is +3. Some elements also exhibit +4 oxidation states. Some elements exhibit +2 oxidation state also due to their half-filled, fully-filled and noble gas configuration.

Chemistry: CUET Mock Test - 10 - Question 38

Which of the following is not a property of lanthanides?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 38

All lanthanides are soft metals with silvery white color. They tarnish rapidly by air. With increase in atomic number, the harness of these metals also increases. The melting points of the lanthanides ranges from 1000 to 1200K but samarium melts at 1623K.

Chemistry: CUET Mock Test - 10 - Question 39

Which of the following is the correct order of arrangement of the first five lanthanides according to atomic number?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 39

The first five elements of Lanthanides are:
Lanthanum (La) – 57
Cerium (Ce) – 58
Praseodymium (Pr) – 59
Neodymium (Nd) – 60
Promethium (Pm) – 61.

Chemistry: CUET Mock Test - 10 - Question 40

Which of the following is not a consequence of lanthanide contraction?

Detailed Solution for Chemistry: CUET Mock Test - 10 - Question 40

The small average decreases in the atomic size is responsible for a small decrease in electronegativity and S.O.P of lanthanides. As the size of the lanthanide ions decreases the covalent character of M—OH bond increases and hence basic strength decreases.

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