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Chemistry: CUET Mock Test - 3 for NEET 2024 is part of Chemistry Practice Tests: CUET Preparation preparation. The Chemistry: CUET Mock Test - 3 questions and answers have been prepared according to the NEET exam syllabus.The Chemistry: CUET Mock Test - 3 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Chemistry: CUET Mock Test - 3 below.
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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

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

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

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 3

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

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

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 4

Which of the following properties holds true for a metalloid?

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

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 5

Which of the following is the correct Gibbs equation?

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

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 6

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

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

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 7

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

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 7

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 8

Which of the following element is most reactive?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 8

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 9

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

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

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 10

Which of the following metals cannot be refined by distillation?

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

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 11

Which is the most abundant group 16 element?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 11

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 12

Which of the following halogen is radioactive?

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

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 13

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

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

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 14

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

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

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 15

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

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

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 16

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 16

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 17

What does the Ellingham diagram consist of?

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

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 18

Which of the following processes is used to purify lead?

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

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 19

Identify the incorrect statement with respect to antibiotics.

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

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 20

Which of the following is a narrow spectrum antibiotic?

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

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.

Chemistry: CUET Mock Test - 3 - Question 21

Which of the following is used as an antiseptic for eyes?

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

Dettol, tincture of iodine and iodoform are common antiseptics that are directly applied on wounds to treat them. Boric acid is prepared as a dilute aqueous solution and acts as an antiseptic for the eyes.

Chemistry: CUET Mock Test - 3 - Question 22

According to the band theory, increase in number of atoms participating in crystal formation leads to ________ in number of molecular orbitals containing electrons.

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

The band theory assumes that atomic orbitals of the atoms of the crystal combine to form molecular orbitals which are spread over the whole crystal structure. Hence, the number of atoms is directly proportional to the number of molecular orbitals formed.

Chemistry: CUET Mock Test - 3 - Question 23

Which of the following is a bactericidal antibiotic?

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

Antibiotics can either kill the target microbes (cidal effect) or can prevent it from pathogenic action (static effect). The former are known as bactericidal and the latter is known as bacteriostatic.

Chemistry: CUET Mock Test - 3 - Question 24

A certain antibiotic X is effective only against a few types of harmful microbes and cells. X is a _______ antibiotic.

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

Antibiotics are classified based on the range of microbes that are affected by it. Broad spectrum antibiotics affect Gram-positive as well as Gram-negative bacteria. Narrow spectrum are used only against either Gram-positive or Gram-negative bacteria, whereas limited spectrum antibiotics kill or inhibit only one particular organism.

Chemistry: CUET Mock Test - 3 - Question 25

Which of the following are not supposed to treat humans directly?

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

Antimalarials and antibiotics are ingested in the form of pills. Antiseptics are applied on the skin. Disinfectants are used for cleaning objects like floors, toilets, drains, etc. and protect them from pathogenic activity.

Chemistry: CUET Mock Test - 3 - Question 26

Which of the following compounds is added in soaps as an antiseptic?

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

Bithionol consists of two dichloro and dihydroxy substituted aromatic rings connected by a sulphur bridge. It is added to soaps as an antiseptic. It also helps to reduce the smell produced by microbial decomposition on the skin.

Chemistry: CUET Mock Test - 3 - Question 27

Which of the following antifertility drugs consists of Estrogen derivatives?

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

Progesterone is a hormone that is known to suppress ovulation. Antifertility drugs are made of synthetic Estrogen and progesterone derivatives. Ethynylestradiol is a drug with a combination of these two derivatives.

Chemistry: CUET Mock Test - 3 - Question 28

What is the minimum number of reactions required for the conversion of aniline to 1,3,5-tribromobenzene?

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

The three reactions are as follows:

  • Reaction 1: Aniline on treatment with bromine water gives 2,4,6-tribromoaniline.
  • Reaction 2: This on diazotisation with HNO2 gives 2,4,6-tribromobenzenediazonium chloride.
  • Reaction 3: This on reaction with H3PO2, reduces the diazo group to hydrogen, to give 1,3,5-tribromobenzene.
Chemistry: CUET Mock Test - 3 - Question 29

Diazonium salts are used in which of the following industries?

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

Coupling reactions of diazonium salts produce azo compounds which are coloured in nature. This is used as an application in the manufacturing of dyes.

Chemistry: CUET Mock Test - 3 - Question 30

Diazonium salts are specifically used as intermediates in the production of which of the following compounds?

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

m-Bromotoluene cannot be prepared from the direct bromination of toluene or by Friedel-Crafts alkylation of bromobenzene, because of the ortho, para directing nature of alkyl groups.

Chemistry: CUET Mock Test - 3 - Question 31

Label the diagram correctly.

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 31

Energy gap is very less (may even be absent) for metals, very huge for non metals and intermediate (small) for semiconductors.

Chemistry: CUET Mock Test - 3 - Question 32

Diazonium salts are primarily used for the preparation of _______ substituted aromatic compounds.

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 32

Diazonium salts are important intermediates for the introduction of -F, -Cl, -Br, -I, etc. groups into an aromatic ring. Certain compounds like aryl fluorides and aryl iodides cannot be prepared by direct halogenation and are prepared from diazonium salts.

Chemistry: CUET Mock Test - 3 - Question 33

What is the main product of the following reaction?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 33

Primary aromatic amines react with nitrous acid at cold temperatures (273-278K) to form diazonium salts. However, if the temperature is more than 278K, phenol is formed along with the evolution of nitrogen gas.

Chemistry: CUET Mock Test - 3 - Question 34

Which of the following is not a final product of the reaction between propylamine and nitrous acid?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 34

CH3CH2CH2N2Cl is a diazonium salt derivative of propanamine and is first formed when it reacts with HNO2. This is a very unstable compound and immediately decomposes to give propanol and evolves nitrogen gas.

Chemistry: CUET Mock Test - 3 - Question 35

Hinsberg’s reagent is ______

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 35

Benzenesulphonyl chloride (C6H5SO2Cl), or arylsulphonyl chloride, is known as Hinsberg’s reagent. It is an important compound used in the distinction of different classes of amines.

Chemistry: CUET Mock Test - 3 - Question 36

Which of the following amines will form a product that is soluble in KOH, on reaction with Hinsberg’s reagent?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 36

The reaction of Hinsberg’s reagent with Isopropylamine gives N-isopropylbenzene sulphonamide. The lone hydrogen attached to the N atom is strongly acidic due to the presence of strong electron withdrawing sulphonyl group. Hence, is it soluble in alkali like KOH.

Chemistry: CUET Mock Test - 3 - Question 37

Aniline is a _______ directing compound.

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 37

The ortho and para positions with respect to NH2 group in aniline are centres of high electron density. This is due to the resonance structures of aniline. Thus, NH2 is ortho and para directing and a powerful activating group.

Chemistry: CUET Mock Test - 3 - Question 38

What is the major product formed when aniline reacts with bromine water at room temperature?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 38

Since amino group is highly ortho and para directing, it substitutes the Br group at the para as well as both ortho positions (2,4,6) to give a white precipitate of a tribromo substituted aniline.

Chemistry: CUET Mock Test - 3 - Question 39

Which among the following statements is correct?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 39

On heating, ferrimagnetic substances become paramagnetic and hence, lose their ferromagnetism. NaCl is diamagnetic in nature. Cobalt is a ferromagnetic substance.

Chemistry: CUET Mock Test - 3 - Question 40

What is the order of quantities of all isomers of nitroaniline formed on the reaction of aniline with nitric acid and sulphuric acid at 288K?

Detailed Solution for Chemistry: CUET Mock Test - 3 - Question 40

Nitration of aniline produces nitro derivatives. Under controlled conditions, aniline is protonated (by strong acidic medium) to form anilinium ion, which is meta directing. Therefore, apart from p-nitroaniline (51%) and o-nitroaniline (2%), a significant amount of m-nitroaniline (47%) is also formed.

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