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Chemistry: CUET Mock Test - 3 - CUET MCQ


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30 Questions MCQ Test CUET Mock Test Series - Chemistry: CUET Mock Test - 3

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Chemistry: CUET Mock Test - 3 - Question 1

What is the coordination number for one-dimensional close packing?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 1

In one-dimensional close packing, the constituent particles are assumed to be arranged in a row. Thus, each constituent particle comes in contact with 2 of its neighbors and thereby giving the coordination number 2.

Chemistry: CUET Mock Test - 3 - Question 2

The decomposition of NH3 on platinum surface is zero order reaction. If k = 2.5 × 10-4 mol L-1s-1 the rate of production of H2 is

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

As reaction is zero order

Rate = k[NH3]0

Rate = k

Rate =

ΔH/Δt = 3k
= 3 × 2.5 × 10–4
= 7.5 × 10–4 mol L–1 s–1

Chemistry: CUET Mock Test - 3 - Question 3

The molecularity of the following elementary reaction is NH4NO2 → N2 + 2H2O

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

The molecularity of an elementary reaction is defined as the number of reactant particles that come together to form the products in a single step.
In the given reaction, NH4NO2 is directly decomposing into N2 and 2H2O. Therefore, this is an elementary reaction, and its molecularity can be determined by counting the number of molecules or atoms that are involved in the reaction.
As we can see, NH4NO2 is the only reactant molecule in this reaction, and it is breaking down into two product molecules, N2 and 2H2O. Therefore, the molecularity of this reaction is one.
The reaction can be represented as:
NH4NO2 → N2 + 2H2O
where NH4NO2 is the reactant and N2 and H2O are the products.
This reaction is an example of a unimolecular reaction, where only one molecule of the reactant is involved in the reaction. The decomposition of NH4NO2 is a first-order reaction, where the rate of the reaction is proportional to the concentration of NH4NO2.
The reaction can be further explained by looking at the balanced chemical equation:
NH4NO2 → N2 + 2H2O

1 molecule of NH4NO2 → 1 molecule of N2 + 2 molecules of H2O

In conclusion, the molecularity of the given elementary reaction NH4NO2 → N2 + 2H2O is one, which means it is a unimolecular reaction where one molecule of the reactant is involved in the reaction.

Only one reacting species is involved, therefore it is a unimolecular reaction.

Chemistry: CUET Mock Test - 3 - Question 4

Which of the following is not the characteristic of physisorption?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 4

Enthalpy of adsorption is high - is NOT a characteristic of physisorption.

  • Adsorption - The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid.
  • Two types of adsorption of gases on solids - Physisorption (physical adsorption) and Chemisorption (chemical adsorption).
  • Physisorption (physical adsorption) - When the accumulation of gas on the surface of a solid occurs on account of weak van der Waals' forces.
  • Chemisorption (chemical adsorption) - When the gas molecules or atoms are held to the solid surface by chemical bonds.

In physisorption, enthalpy of adsorption is low ( 20- 40 kJ mol–1 ) whereas in the case of chemisorption enthalpy of adsorption is high (80 – 240 kJmol–1 )

Chemistry: CUET Mock Test - 3 - Question 5

Which one of the following is an emulsion?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 5

An emulsion is a type of colloid in which one liquid is dispersed in another immiscible liquid in the form of small droplets.
Hair cream is an example of an emulsion where oil droplets are dispersed in water. Paint can also be classified as an emulsion or a suspension depending on the type of paint.
Cheese, on the other hand, is a type of colloid where solid particles are dispersed in a liquid. Smoke is an aerosol, which is a type of colloid where solid or liquid particles are suspended in a gas.

Chemistry: CUET Mock Test - 3 - Question 6

Caprolactam is the starting material for

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 6

Caprolactam is the starting material for Nylon 6.
Nylon 6 is a synthetic polymer made of repeating units of ε-Caprolactam. Caprolactam is a cyclic amide with the chemical formula (CH₂)₅C(O)NH.
It is produced by the reaction of cyclohexanone with ammonium sulfate, followed by a series of purification steps. The purified caprolactam is then used in the polymerization reaction to produce Nylon 6.
During the polymerization reaction, caprolactam molecules are opened up and linked together through amide bonds to form long chains of Nylon 6.
These chains can then be further processed into fibers, films, and other forms used in various applications such as textiles, carpets, and packaging.
In summary, caprolactam is the starting material for Nylon 6, a versatile and widely used synthetic polymer.

Chemistry: CUET Mock Test - 3 - Question 7
Which one of the following is NOT an example of colloids?
Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 7

The correct answer is the Tincture of iodine.

Key Points

  • The classification of colloids is done on the basis of their constituents which are dispersed phase and dispersing medium.
  • Colloids cannot be discredited by filtration but can be separated by centrifugation.
  • Fat is separated from milk by centrifugation.
  • Jelly is a colloid, in which a segment of sugar found strung in water and a condense named pectin.
  • Fog is a colloid, in which drops of liquid water are spread through the air.
Chemistry: CUET Mock Test - 3 - Question 8
Tyndall effect is not observed in which of the following --
Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 8

The Tyndall effect is the scattering of light as a light beam passes through a colloid. This effect is used to determine whether a mixture is a true solution or a colloid. Milk, starch solution and emulsions show Tyndall effect whereas sugar solution doesn’t show Tyndall effect.

Chemistry: CUET Mock Test - 3 - Question 9
Froth floatation method is mostly used for the concentration of _____________
Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 9

Concept:

Process of Concentration

  • The metal ores extracted contain impurities known as gauge particles.
  • The gauge particle is separated from the ore by the process known as concentration.
  • Froth flotation, magnetic separation, Leaching are some of the commonly used processes of concentration.

Froth floatation method

  • It is a process that selectively separates materials based upon whether they are water-repelling (hydrophobic) or have an affinity for water (hydrophilic).
  • If the minerals are of Hydrophobic nature then only can get attracted toward froth and not with water.
  • The process is commonly used for sulphide ores.
  • This is because pine oil used in the process selectively wets the sulphide ore and hence brings it to the froth.
  • Froth flotation can primarily be done under two common techniques:
    • Direct floatation technique- The mineral sticks to the air bubble and the remaining gangue settles down at the bottom.
    • Reverse floatation technique- The gangue sticks to the air bubble and ore particle settle down in the bottom.

So, the correct option is Sulphide Ores.

Additional Information:

Magnetic Separation

  • Magnetic ores are mainly separated by magnetic separation method.
  • It has a conveyer belt with an electromagnetic. The powdered ore is made to pass through belt and electromagnet.
Chemistry: CUET Mock Test - 3 - Question 10

Which of the following statement is CORRECT regarding the properties of Phosphine gas?

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

The correct answer is option 2.

  • The properties of Phosphine gas (PH3) are - It is a colourless gas, smelling like rotten fish, and is a highly poisonous gas.
    • It explodes in the presence of traces of oxidizing agents like HNO3, Cl2, and Br2. It is slightly soluble in water.
    • The solution of Phosphine in water decomposes in the presence of light giving red phosphorous and hydrogen.
    • When absorbed in copper sulphate or mercuric chloride solution, the corresponding Phosphides are obtained.

3CuSo4 + 2PH→ Cu3P2 + 3H2SO4
3HgC12 + 2PH3 → Hg3P2 + 6HC1

  • Phosphine is weakly basic and gives Phosphonium compounds with acids.

PH3 + HBr → PH4 Br

  • Ammonia (NH3) gas - It is a colourless gas with a pungent odour. It is highly soluble in water. Its freezing and boiling points are 198.4 and 239.7 K respectively. (Explains Option 1)
  • Oxygen (O2) gas - It is a colourless and odourless gas. It is fairly soluble in water. it liquifies at 90 K and freezes at 55 K. It directly reacts with nearly all metals and non-metals. (Explains Option 3)
  • Chlorine (Cl2) gas - It is a greenish-yellow gas with a pungent and suffocating odour. It is about 2-5 times heavier than air. It is soluble in water. It has a great affinity for hydrogen. (Explains Option 4)
Chemistry: CUET Mock Test - 3 - Question 11
Acetyl chloride is an example of which functional group?
Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 11

Acetyl chloride is an example of Acyl halide group.

  • An acyl halide is a chemical compound derived from an oxoacid by substituting a halide group for a hydroxyl group.
  • Acetyl chloride (CH3COCl) is an acetic acid derivative of acyl chloride.
  • It belongs to the organic compound class, called the acyl halides.
  • It is a fluid which is colourless, corrosive and volatile.
Chemistry: CUET Mock Test - 3 - Question 12

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

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 12

In a two-dimensional square close packed structure, each sphere is in contact with 4 of its adjacent spheres. Hence, it has coordination number 4.

Chemistry: CUET Mock Test - 3 - Question 13

Voids in two-dimensional hexagonal close packed structure are ___________ in shape.

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 13

Two-dimensional hexagonal close packed structure are formed when one row of a one-dimensional structure is placed below another in such a way that spheres of second row fit in the depressions of the first row and thereby creating triangular voids between them.

Chemistry: CUET Mock Test - 3 - Question 14

Which of the following properties holds true for a metalloid?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 14

Metalloids have properties intermediate to those of metals and non-metals. They are non-malleable, non-ductile and brittle. They are poor conductors of heat and electricity as compared to metals, but are better conductors than non-metals.

Chemistry: CUET Mock Test - 3 - Question 15

Which of the following is the correct Gibbs equation?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 15

For any process, the change in Gibbs free energy (ΔG) is given by the equation,
ΔG = ΔH – TΔS
Where ΔH is the enthalpy change, ΔS is the entropy change and T is the absolute temperature.

Chemistry: CUET Mock Test - 3 - Question 16

Which of the following is not an impurity generally present in crude metals?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 16

The impurities generally present in crude metals consist of other metals, formed by reduction of their respective oxides present in the ore, non-metals such as silicon and phosphorus, unreacted oxides and sulphides of the metals and substances taken up in the furnace such as slag.

Chemistry: CUET Mock Test - 3 - Question 17

Which of the following elements does not belong to group 16 of the periodic table?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 17

Group 16 of the periodic table consists of five elements viz., Oxygen (O), Sulphur (S), Selenium (Se), Tellurium (Te) and Polonium (Po). The elements of this group are commonly known as the oxygen family after the name of its first member.

Chemistry: CUET Mock Test - 3 - Question 18

Which of the following element is most reactive?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 18

Of all the halogens, fluorine is the most reactive and hence is also called super halogen. Fluorine is also the most electronegative (EN = 4.0) element in the periodic table. This indicates that fluorine has a high tendency to gain electrons from other elements with lower electronegativities.

Chemistry: CUET Mock Test - 3 - Question 19

What is the criterion of the feasibility of a reaction at any temperature?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 19

The criterion of the feasibility of a reaction at any temperature is that the ΔG of the reaction must be negative. For a reaction to be spontaneous, the value of the change in Gibbs energy of the reaction must always be negative.

Chemistry: CUET Mock Test - 3 - Question 20

Which of the following metals cannot be refined by distillation?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 20

The correct option is D Tin
Distillation process is used for refining metals that are usually volatile in nature i.e. they have low boiling points. Zinc, cadmium and mercury are refined via distillation where the pure metal distills over leaving behind the non-volatile impurities.
Tin is refined via liquation process since it is a low melting metal.

Chemistry: CUET Mock Test - 3 - Question 21

Which is the most abundant group 16 element?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 21

Oxygen is the most abundant of all elements. It occurs in the free state as dioxygen (O2) and makes up 20.46% by volume and 23% by mass of the atmosphere. It also occurs in the form of ozone (O3).

Chemistry: CUET Mock Test - 3 - Question 22

Which of the following halogen is radioactive?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 22

Astatine (Atomic No. = 85, Symbol-At) is radioactive and hence occurs in nature only in traces. Therefore, not much is known about its chemistry, though it might be expected to be a metalloid.

Chemistry: CUET Mock Test - 3 - Question 23

How can a reaction with positive ΔG be made to occur?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 23

A reaction with ΔG positive can still be made to occur by coupling it with another reaction having large negative ΔG so that the net ΔG of the two reactions is negative (ΔG = change in the Gibbs energy of the reaction).

Chemistry: CUET Mock Test - 3 - Question 24

For a metallic crystal, which band do the delocalized electrons occupy?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 24

A metallic crystal has valence electrons in the valence band and free moving, delocalized electrons in the conduction band. For a metal, these two bands are very close to each other.

Chemistry: CUET Mock Test - 3 - Question 25

Metals are good conductors of heat and electricity. This property is conferred by _______ bonds.

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 25

Metallic bonds are formed between positive metal ions and the sea of delocalized electrons. This bond is stronger than covalent and ionic bonds. Due to the mobility of electrons, conduction of heat and electricity is feasible.

Chemistry: CUET Mock Test - 3 - Question 26

A substance containing one band completely filled with electrons and other band completely empty, but with a possibility of the empty band becoming populated, behaves as a _________

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 26

Semiconductors have completely filled valence bands and completely empty conduction bands. The energy gap between the two bands is relatively small and can be overcome by supplying heat, which excites some electrons to the conduction band, thus allowing the conduction of electricity.

Chemistry: CUET Mock Test - 3 - Question 27

What does the Ellingham diagram consist of?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 27

Ellingham diagram normally consists of plots of ΔfG° vs T for formation of oxides of elements. Similar diagrams can also be constructed for sulphides and halides of elements. These diagrams help us in predicting the feasibility of thermal reduction of an ore.

Chemistry: CUET Mock Test - 3 - Question 28

Which of the following processes is used to purify lead?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 28

Liquation is used for purification of metals that contain impurities which are less fusible than the metals themselves, that is, the melting points of the metals are lower than that of the impurities. Lead is refined by liquation process.

Chemistry: CUET Mock Test - 3 - Question 29

Identify the incorrect statement with respect to antibiotics.

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 29

Penicillin is an antibacterial compound derived from Penicillium. It has a bactericidal effect on microbes. Ampicillin is a modified version of penicillin with a wider spectrum. Arsphenamine is an -As=As- linkage compound that resists bacterial action and is also toxic to human beings. Sulphanilamide is an active antibiotic compound formed in the body.

Chemistry: CUET Mock Test - 3 - Question 30

Which of the following is a narrow spectrum antibiotic?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 30

Dysidazirine is effective in treatment of only certain strains of tumour cells, hence they are narrow spectrum. Chloramphenicol, vancomycin and amoxycillin are examples of broad-spectrum antibiotics, that are used for treating different types of problems.

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