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NEET Practice Test - 23 - NEET MCQ


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30 Questions MCQ Test - NEET Practice Test - 23

NEET Practice Test - 23 for NEET 2024 is part of NEET preparation. The NEET Practice Test - 23 questions and answers have been prepared according to the NEET exam syllabus.The NEET Practice Test - 23 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Practice Test - 23 below.
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NEET Practice Test - 23 - Question 1
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The standard enthalpy of formation (∆fH°298) for methane, CH4 is – 74.9 kJ mol–1. In order to calculate the average energy given out in the formation of a C – H bond from this it is necessary to know which one of the following?

Detailed Solution for NEET Practice Test - 23 - Question 1
To calculate average enthalpy of C - FI bond in methane following informations are needed

(i) dissociation energy of H2, i.e.

∆H = x(Suppose)

(ii) Sublimation energy of C(graphite) to C(g)

∆H = y (Suppose)

C (graphite) + 2H 2(g) → CH4 (g); ∆H = 75 kj mol-1

NEET Practice Test - 23 - Question 2
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Addition of HI to double bond of propene yields isopropyl iodide and not n-propyl iodide as the major product, because addition proceeds through

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All are examples of electrophilic addition reactions and involve the formation of stable carbocation leading to the formation of addition product according to Markovnikov’s rule
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NEET Practice Test - 23 - Question 3
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Which of the following is a redox reaction?

Detailed Solution for NEET Practice Test - 23 - Question 3
N2 + O2 → 2NO

O.N. of N changes from 0 to +2 (oxidation) and O.N. of O changes from O to -2 (reduction).

NEET Practice Test - 23 - Question 4
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The major organic compound formed by the reaction of 1, 1, 1-trichloroethane with silver powder is:
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NEET Practice Test - 23 - Question 5
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The electronegativity follows the order
Detailed Solution for NEET Practice Test - 23 - Question 5
F and O belong to 2nd period whereas Cl and Br belong to the 3rd and 4th periods respectively. Hence the sequence of the E.N. is F>0>C l>B r
NEET Practice Test - 23 - Question 6
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The anime that does not react with acetyl chloride is
Detailed Solution for NEET Practice Test - 23 - Question 6
The compounds containing active H-atoms (H atoms attached to N, O or S) react with CH3COCl to form acetyl derivatives.
NEET Practice Test - 23 - Question 7
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The activation energy for a hypothetical reaction, A → Product, is 12.49 kcal/mole. If temperature is raised from 295 to 305, the rate of reaction increased by
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For 10°C rise of temperature the rate is almost doubled,
NEET Practice Test - 23 - Question 8
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Indicate the wrongly named compound
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NEET Practice Test - 23 - Question 9
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Which one of the following pairs of molecules will have permanent dipole moments for both members?
Detailed Solution for NEET Practice Test - 23 - Question 9
SiF4 and CO2 have zero dipole moment due to symmetrical tetrahedral and linear structures, NO2 and O3 both have V-shape and certain value for dipole moment.
NEET Practice Test - 23 - Question 10
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An unknown metal M displaces nickel from nickel (II) sulphate solution but does not displace manganese from manganese sulphate solution. Which order represents the correct order of reducing power?
Detailed Solution for NEET Practice Test - 23 - Question 10
Oxidation potential of M is more than N and less than Mn. Hence reducing power Mn > M > Ni
NEET Practice Test - 23 - Question 11
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Beilstein’s test is given by which of the following:
Detailed Solution for NEET Practice Test - 23 - Question 11
Pyridine and thiourea form volatile cupric cyanide and also give bluish green flame like volatile cupric halides.
NEET Practice Test - 23 - Question 12
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At STP, the order of root mean square speed of molecules H2, N2, O2 and HBr is
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NEET Practice Test - 23 - Question 13
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Match list I with list II and select the correct answer using the codes given below the lists:
Detailed Solution for NEET Practice Test - 23 - Question 13
Cyanide process is for gold (I-D); floatation process - pine oil (II-B); Electrolytic reduction - A1 (III-C); Zone refining -Ge (IV-A).
NEET Practice Test - 23 - Question 14
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The radius of the second Bohr orbit for hydrogen atoms is : (Plank's const. h = 6.6262 × 10–34 Js ; mass of electron = 9.1091 × 10–31 kg ; charge of electron e = 1.60210 × 10–19 C ; permittivity of vacuum ε0 = 8.854185 × 10–12 kg–1 m–3 A2)
Detailed Solution for NEET Practice Test - 23 - Question 14
Radius of nth Bohr orbit in H -atom = 0.53 n2Å

Radius of II Bohr orbit t = 0.53 x (2)2

= 2.12Å

NEET Practice Test - 23 - Question 15
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The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM.

The correct one is
NEET Practice Test - 23 - Question 16
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CsCl crystallises in a body centered cubic lattice.

If ‘a’ is its edge length then which of the following expressions is correct?
Detailed Solution for NEET Practice Test - 23 - Question 16
Relation between radius of cation, anion and edge length of the cube

NEET Practice Test - 23 - Question 17
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The ether that undergoes electrophilic substitution reactions is
NEET Practice Test - 23 - Question 18
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When gypsum is heated to 393 K, it forms:
Detailed Solution for NEET Practice Test - 23 - Question 18
Gypsum on heating to 393 K forms plaster ofParis.

NEET Practice Test - 23 - Question 19
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Number of electrons transferred in each case when KMnO4 acts as an oxidising agent to give MnO2, Mn2+, Mn(OH)3 and MnO42- are respectively
NEET Practice Test - 23 - Question 20
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Which of the following is a biodegradable polymer?
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NEET Practice Test - 23 - Question 21
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Consider the following changes

The energy required to pull out the two electrons are E1 and E2 respectively. The correct relationship between two energies would be
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IE1 is always less than IE2
NEET Practice Test - 23 - Question 22
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Which one of the following statements is not true?
Detailed Solution for NEET Practice Test - 23 - Question 22
The pH of 1 x 10-8 M HCl is always less than 7. Since the solution is of acid . It can be shown as

[H+] = 10-7 from H2O and 10-8 from HCl

[ H+] 10-8 (10 : 1)

[H+] = 10-8 x 11

- log [H+] = 8 log 10 - log 11

pH = 8 - log 11

pH=6.93.

NEET Practice Test - 23 - Question 23
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Which of the following is not formed when glycerol reacts with HI?
NEET Practice Test - 23 - Question 24
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For preparing a buffer solution of pH 6 by mixing sodium acetate and acetic acid, the ratio of the concentration of salt and acid should be (Ka = 10–5)
Detailed Solution for NEET Practice Test - 23 - Question 24

∴

or 10:1.

NEET Practice Test - 23 - Question 25
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BCl3 is a planar molecule whereas NCl3 is pyramidal because
Detailed Solution for NEET Practice Test - 23 - Question 25
(a) In BCl3 there is sp2 hybridisation (planar) in NCl3 hybridisation is sp3 hence shape is pyramidal
NEET Practice Test - 23 - Question 26
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An organic compound, C3H6O does not give a precipitate with 2,4-dinitrophenyl-hydrazine reagent and does not react with metallic sodium.

It could be
Detailed Solution for NEET Practice Test - 23 - Question 26
Negative reaction with 2, 4- dinitrophenyl-hydrazine indicates absence of aldehydic (option a ) and ketonic (option c) group, while negative reaction with metallic sodium indicates absence of an alcoholic group (option b), hence die organic compound, C3H6O is CH2 = CHOCH3 (option d).
NEET Practice Test - 23 - Question 27
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An element has a bcc structure having unit cells 12.08 × 1023. The number of atoms in these cells is
Detailed Solution for NEET Practice Test - 23 - Question 27
Number of unit cells

= Total number of atoms / Rank of Unit Cell ( Z )

∴ Number of atoms = 12.08 x 1023 x 2 = 24 .16 x 1023 (for bcc z = 2)

NEET Practice Test - 23 - Question 28
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From the following statements regarding H2O2, choose the incorrect statement:
Detailed Solution for NEET Practice Test - 23 - Question 28
H2O2 has oxidizing and reducing properties both.
NEET Practice Test - 23 - Question 29
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Complete hydrolysis of starch gives :
Detailed Solution for NEET Practice Test - 23 - Question 29
Starch is a mixture of amylose & amylopectin polysaccharides and monomer is glucose. Thus on complete hydrolysis it gives only glucose.
NEET Practice Test - 23 - Question 30
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Which of the following is not true?
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