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NEET Practice Test - 24 - NEET MCQ


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30 Questions MCQ Test - NEET Practice Test - 24

NEET Practice Test - 24 for NEET 2024 is part of NEET preparation. The NEET Practice Test - 24 questions and answers have been prepared according to the NEET exam syllabus.The NEET Practice Test - 24 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Practice Test - 24 below.
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NEET Practice Test - 24 - Question 1
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Higher order (>3) reactions are rare due to:

Detailed Solution for NEET Practice Test - 24 - Question 1
Reactions of higher order (>3) are very rare due to very less chances of many molecules to undergo effective collisions.
NEET Practice Test - 24 - Question 2
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A compound of a metal ion Mx+ (Z = 24) has a spin only magnetic moment of √15 Bohr Magnetons. The number of unpaired electrons in the compound are

Detailed Solution for NEET Practice Test - 24 - Question 2
Magnetic moment

µ =

where n = number of unpaired electrons √15 =

∴ n = 3

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NEET Practice Test - 24 - Question 3
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Iron sulphide is heated in air to form A, an oxide of sulphur. A is dissolved in water to give an acid. The basicity of this acid is

Detailed Solution for NEET Practice Test - 24 - Question 3
4FeS + 7O2 → 2Fe2O3 + 4SO2

It is dibasic

NEET Practice Test - 24 - Question 4
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Which of the following is an expression of Raoult's law if PA is the partial pressure of the solvent in a solution. P0A is the partial pressure of pure solvent and if XA and XB are the mole fraction of the solute and the solvent respectively?
Detailed Solution for NEET Practice Test - 24 - Question 4
According to Raoult's law pA = p°A x xB (partial pressure of solvent is equal to pure pressure of solvent multiplied by mole fraction of solvent.
NEET Practice Test - 24 - Question 5
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Phenol on reaction with Br2 in non-polar aprotic solvent furnishes
Detailed Solution for NEET Practice Test - 24 - Question 5
In presence of non-protic solvent such as CHCl3 or CCl4, concentration of electrophile (Br+) is less, hence reaction stops at the monobromo stage
NEET Practice Test - 24 - Question 6
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Which one of the following arrangements represents the correct order of solubilities of sparingly soluble salts Hg2Cl2, Cr2(SO4)3, BaSO4 and CrCl3 respectively ?
Detailed Solution for NEET Practice Test - 24 - Question 6

Hence the correct order of solubilities of salts is

NEET Practice Test - 24 - Question 7
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α-D-glucose and β-D-glucose differ from each other due to difference in one carbon with respect to its:
Detailed Solution for NEET Practice Test - 24 - Question 7
α-D-glucose and β-D-glucose difFer in the arrangement of groups around one carbon atom (C1) i.e. they differ in configuration at C1 , hence these are also known as anomers.
NEET Practice Test - 24 - Question 8
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In which of the following Tyndall effect is not observed?
Detailed Solution for NEET Practice Test - 24 - Question 8
Sugar forms a homogeneous solution hence no Tyndall effect is exhibited.
NEET Practice Test - 24 - Question 9
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The hypothetical complex chloro diaquatriamminecobalt (III) chloride can be represented as
Detailed Solution for NEET Practice Test - 24 - Question 9
The complex chlorodiaquatriammine cobalt (III) chloride can have the structure [CoC1(NH3)3(H2O)2]Cl2.
NEET Practice Test - 24 - Question 10
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The pH of a solution is increased from 3 to 6; its H+ ion concentration will be
Detailed Solution for NEET Practice Test - 24 - Question 10
pH = 3 . [ H+] = 10-3; pH = 6 ∴ [H+] = 10-6.

Hence [H+] reduced by 10”3 times.

NEET Practice Test - 24 - Question 11
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Identify the statement that is not correct as far as structure of diborane is concerned
NEET Practice Test - 24 - Question 12
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Which one of the following compounds possesses the most acidic hydrogen?
Detailed Solution for NEET Practice Test - 24 - Question 12
Acidic strength ∝ —I, - M effect. Due to the strong - 1, and -M effect of three - COOCH3 groups, it has the most acidic Hydrogen.
NEET Practice Test - 24 - Question 13
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Ozone is an important constituent of stratosphere because it:
Detailed Solution for NEET Practice Test - 24 - Question 13
Ozone absorbs U. V. Radiations harmful to human life.
NEET Practice Test - 24 - Question 14
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Which of the following statements is correct?
Detailed Solution for NEET Practice Test - 24 - Question 14
Gluconic acid is obtained by partial oxidation of glucose by mild oxidising agent e.g. Tollen’s reagent, Fehling solution, Br2 water.

Gluconic acid can not form hemiacetal or acetal.

NEET Practice Test - 24 - Question 15
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Which one of the following is an example of homogeneous catalysis?
Detailed Solution for NEET Practice Test - 24 - Question 15
In acid hydrolysis of methyl acetate all are present in one phase (liquid)
NEET Practice Test - 24 - Question 16
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An element (X) forms compounds of the formula XCl3, X2O5 and Ca3X2 but does not form XCl5.

Which of the following is element X ?
Detailed Solution for NEET Practice Test - 24 - Question 16
Nitrogen can form NCl3, N2O5 Ca3N2 and not NCl5 since it has no d atomic orbitals in the valence shell.
NEET Practice Test - 24 - Question 17
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Both geometrical and optical isomerisms are shown by
Detailed Solution for NEET Practice Test - 24 - Question 17
The compounds of the type M(AA)2B2 exhibit both geometrical and optical isomerism.
NEET Practice Test - 24 - Question 18
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Which of the following is the strongest Lewis base?
NEET Practice Test - 24 - Question 19
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Which of the following order is wrong?
Detailed Solution for NEET Practice Test - 24 - Question 19
The right sequence of I.E1 of Li < B < Be < C.
NEET Practice Test - 24 - Question 20
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In which of the following sets, all the given species are isostructural?
Detailed Solution for NEET Practice Test - 24 - Question 20
All have tetrahedral structure.
NEET Practice Test - 24 - Question 21
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Which of the following cannot be made by using Williamson’s synthesis?
Detailed Solution for NEET Practice Test - 24 - Question 21
The two components should be (CH3)3CONa + (CH3)3CBr. However, tert-alkyl halides tend to undergo elimination reaction rather than substitution leading to the formation of an alkene, Me2C = CH2
NEET Practice Test - 24 - Question 22
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Match the columns
NEET Practice Test - 24 - Question 23
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A metallic crystal crystallizes into a lattice containing a sequence of layers AB AB AB......Any packing of spheres leaves out voids in the lattice. What percentage of volume of this lattice is empty space?
Detailed Solution for NEET Practice Test - 24 - Question 23
In ABAB packing spheres occupy 74%. 26% is empty,
NEET Practice Test - 24 - Question 24
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Which among the following factors is the most important in making fluorine the strongest oxidizing halogen?
Detailed Solution for NEET Practice Test - 24 - Question 24
The fluorine has low dissociation energy of F - F bond and reaction of atomic fluorine is exothermic in nature
NEET Practice Test - 24 - Question 25
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Identify the incorrect statement:
Detailed Solution for NEET Practice Test - 24 - Question 25
The S6 molecule has a chair-form hexagon ring with the same bond length as that in S8, but with somewhat smaller bond angles i.e. bond lengths are same but bond angles are different.

NEET Practice Test - 24 - Question 26
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The most electropositive metals are isolated from their ores by:
Detailed Solution for NEET Practice Test - 24 - Question 26
Most electropositive metals are obtained by electrolysis of their fused ionic salts.
NEET Practice Test - 24 - Question 27
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Which of the following is not correctly matched?
Detailed Solution for NEET Practice Test - 24 - Question 27
Terylene is prepared by condensing terephthalic acid and ethylene glycol

NEET Practice Test - 24 - Question 28
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The first ionization energies of alkaline earth metals are higher than those of the alkali metals.

This is because
NEET Practice Test - 24 - Question 29
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The correct order of increasing acid strength of the compounds
Detailed Solution for NEET Practice Test - 24 - Question 29
The correct order of increasing acid strength

CH3. COOH > MeOCH2COOH > CH3COOH > (Me)2CH.COOH

Electron withdrawing groups increase the acid strength and electron donating groups decrease the acid strength.

NEET Practice Test - 24 - Question 30
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Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases H2O2 acts as a reducing agent in acid medium?
Detailed Solution for NEET Practice Test - 24 - Question 30
H2O2 acts as a reducing agent only in presence of strong oxidising agents (i,e., MnO4-) in acidic as well as alkaline medium.

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