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NEET Practice Test - 16 - NEET MCQ


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30 Questions MCQ Test - NEET Practice Test - 16

NEET Practice Test - 16 for NEET 2024 is part of NEET preparation. The NEET Practice Test - 16 questions and answers have been prepared according to the NEET exam syllabus.The NEET Practice Test - 16 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Practice Test - 16 below.
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NEET Practice Test - 16 - Question 1
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The enolic form of a acetone contains

Detailed Solution for NEET Practice Test - 16 - Question 1

has 9σ,1π and 2 lone pairs.

NEET Practice Test - 16 - Question 2
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What is Z in the following sequence of reactions?

Detailed Solution for NEET Practice Test - 16 - Question 2
Reagents used in the various steps indicate that the compound Z has an alcoholic group. This set of reactions is possible only when Z is CH3CHOHCH3.

In options a and c, Y cannot be converted back into d by the given series of reactions.

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NEET Practice Test - 16 - Question 3
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An example of electrophilic substitution reaction is :

Detailed Solution for NEET Practice Test - 16 - Question 3
Chlorination of methane proceeds via free radical mechanism. Conversion of methyl chloride to methyl alcohol proceeds via nucleophilic substitution. Formation of ethylene from ethyl alcohol proceeds via dehydration reaction. Nitration of benzene is electrophilic substitution reaction.
NEET Practice Test - 16 - Question 4
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Ozone hole refers to:
Detailed Solution for NEET Practice Test - 16 - Question 4
Ozone hole is reduction in thickness of ozone layer in stratosphere.
NEET Practice Test - 16 - Question 5
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Match the columns
Detailed Solution for NEET Practice Test - 16 - Question 5
Alkyl iodides are often prepared by the reaction of alkyl chlorides/bromides with Nal in dry acetone. This reaction is known as Finkelstein reaction.

NaCl or NaBr thus formed is precipitated in dry acetone. It facilitates the forward reaction according to Le Chatelier’s principle. The synthesis of alkyl fluorides is best accomplished by heating an alkyl chloride/bromide in the presence of a metallic fluoride such as AgF, Hg2F2, CoF2 or SbF3. The reaction is termed as Swarts reaction.

H3C - Br + AgF → H3C - F + AgBr

NEET Practice Test - 16 - Question 6
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In an adiabatic process, no transfer of heat takes place between system and surroundings.

Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following.
Detailed Solution for NEET Practice Test - 16 - Question 6
Justification: free expansion w = 0

adiabatic process q = 0

ΔU = q + w = 0, this means that internal energy remains constant. Therefore,

ΔT = G.

NEET Practice Test - 16 - Question 7
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Which is not the disproportionation reaction ?
Detailed Solution for NEET Practice Test - 16 - Question 7
In NH4NO3, there are two different N-atoms (NH+4, NO-3) with different oxidation numbers, thus reaction is not disproportionation.
NEET Practice Test - 16 - Question 8
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The correct order of solubility in water for He, Ne, Ar, Kr, Xe is
Detailed Solution for NEET Practice Test - 16 - Question 8
As the molecular weight of noble gas atoms increases down the group its polarity increases due to which van- der-waal’s force between them increases. Due to increased polarity of heavier inert gas, its solubility in water also increases. So, m ost soluble gas will be Xe and least soluble will be He.

So correct order is Xe > Kr > Ar > Ne > He

NEET Practice Test - 16 - Question 9
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When dihydroxyacetone reacts with HIO4, the product is/are :
Detailed Solution for NEET Practice Test - 16 - Question 9

NEET Practice Test - 16 - Question 10
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Which of the following possesses a sp-carbon in its structure ?
Detailed Solution for NEET Practice Test - 16 - Question 10

NEET Practice Test - 16 - Question 11
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Sucrose in water is dextro-rotatory, [α]D= + 66.4º.

When boiled with dilute HCl, the solution becomes leavo-rotatory, [α]D = –20º. In this process the sucrose molecule breaks into
Detailed Solution for NEET Practice Test - 16 - Question 11
The hydrolysis of sucrose by boiling with mineral acid or by enzyme invertase or sucrase produces a mixture of equal molecules of D (+)-glucose and D (-) -Fructose.

NEET Practice Test - 16 - Question 12
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Which of the following statement is not true about secondary structure of protein ?
Detailed Solution for NEET Practice Test - 16 - Question 12
The hydrophilic/ hydrophobic character of amino acid residues is important to tertiary structure of protein rather than to secondary structure. In secondary structure, it is the sterie size of the residues that is important and residues are positioned to minimise interactions between each other and the peptide chain.
NEET Practice Test - 16 - Question 13
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The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence:
Detailed Solution for NEET Practice Test - 16 - Question 13
p-p overlap between B and F is maximum due to identical size and energy of p- orbitals, so electron deficiency in boron of BF3 is neutralized partially to the maximum extent by back donation.

Hence BF3 is least acidic.

NEET Practice Test - 16 - Question 14
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Which of the following is correct order of acidity?
NEET Practice Test - 16 - Question 15
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Which of the following reactions can produce aniline as main product?
Detailed Solution for NEET Practice Test - 16 - Question 15
Various products are formed when nitroarenes are reduced. These are given below for C6H5NO2.

Thus, Aniline will be main product in case of (d).

NEET Practice Test - 16 - Question 16
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The unit of equivalent conductivity is
Detailed Solution for NEET Practice Test - 16 - Question 16
The equivalent conductivity of a solution,

Where,

K = specific conductance = Unit ohm-1 cm-1

C = normality of the solution unit g eq/cm3

Hence, the unit of ∧eq is Ohm-1.cm2 (gm equivalent)-1.

NEET Practice Test - 16 - Question 17
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Tertiary nitro compounds do not tautomerise because
NEET Practice Test - 16 - Question 18
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Which of the following liberates O2 upon hydrolysis?
Detailed Solution for NEET Practice Test - 16 - Question 18

(a) Pb3O4 is insoluble in water or do not react with water.

(b) 2KO2 + 2H2O → 2KOH + H2O2 + O2

(c) Na2O2 + 2H2O → 2NaOH + H2O2

(d) Li2O2 + 2H2O → 2 LiOH + H2O2

NEET Practice Test - 16 - Question 19
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Following reaction occurrs in an automobile

2C8H18 (g) + 25O2 (g) → 16CO2 (g) + 18H2O (g)

The sign of ΔH,ΔS and ΔG would be
Detailed Solution for NEET Practice Test - 16 - Question 19
For combustion reaction, ΔH is negative, Δn = (16 + 18) - (25 + 2) = +7, so ΔS is + ve, reaction is spontaneous, hence ΔG is -ve.
NEET Practice Test - 16 - Question 20
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Complexes formed in the following methods are

I. Mond's process for purification of nickel.

II. Removal of lead poisoning from the body.

III. Cyanide process for extraction of silver.

IV. Froth flotation process for separation of ZnS from galena ore by using depressant.
NEET Practice Test - 16 - Question 21
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Structurally biodegradable detergents, should contain
Detailed Solution for NEET Practice Test - 16 - Question 21
Structurally, biodegradable detergents should contain branched alkyl chain.
NEET Practice Test - 16 - Question 22
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Which of the following does not represent the correct order of the properties indicated?
Detailed Solution for NEET Practice Test - 16 - Question 22

In a period on moving left to right ionic radii decreases.

NEET Practice Test - 16 - Question 23
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The electrons, identified by quantum numbers n and l

(i) n = 4, l = 1

(ii) n = 4, l = 0

(iii) n = 3, l = 2

(iv) n = 3, l = 1

can be placed in order of increasing energy, from the lowest to highest, as
Detailed Solution for NEET Practice Test - 16 - Question 23
According to the (n + 1) rule the higher the value of (n +1), the higher is the energy. When (n +1) value is the same see value of n.

NEET Practice Test - 16 - Question 24
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In which of the following cases, the stability of two oxidation states is correctly represented
Detailed Solution for NEET Practice Test - 16 - Question 24
Mn2+ (3d5) is more stable than Mn3+ (3d4).
NEET Practice Test - 16 - Question 25
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The major organic product in the reaction,

CH3 — O — CH(CH3)2 + HI → Product is
Detailed Solution for NEET Practice Test - 16 - Question 25
In case of unsymmetrical ethers, the site of cleavage depends on the nature of alkyl group e.g.,

NEET Practice Test - 16 - Question 26
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The correct IUPAC name for
NEET Practice Test - 16 - Question 27
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A certain compound (X) when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution, the precipitate turns white. The compound is
Detailed Solution for NEET Practice Test - 16 - Question 27
KI reacts with CuSO4 solution to produce cuprous iodide (white precipitate) and I2 (which gives brown colour) Iodine reacts with hypo (Na2S2O35H2O) solution. Decolourisation of solution shows the appearance of white precipitate.

NEET Practice Test - 16 - Question 28
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Which one of the following complexes will have four different isomers ?
NEET Practice Test - 16 - Question 29
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Select correct statement(s).
Detailed Solution for NEET Practice Test - 16 - Question 29
In CO2 we have 22 (6 + 8 + 8 = 22) electrons. In (CN22-), we have 22 (6 + 7 + 7 + 2 = 22) electrons. Both CO2 and (CN22-) have linear structures. Thus, statement (a) is correct.

i.e., statement (b) is also correct.

The structure of CaC2 is of NaCl type

i.e., statement (c) is also correct.

NEET Practice Test - 16 - Question 30
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Which of the following statements is not true ?
Detailed Solution for NEET Practice Test - 16 - Question 30
NO2 is paramagnetic and readily dimerises to N2O4 which is diamagnetic.
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