Which of the following statements is not true for halogens?
a.
All form monobasic oxyacids.
b.
All are oxidizing agents.
c.
All but fluorine show positive oxidation states.
d.
Chlorine has the highest electron-gain enthalpy.
Correct Answer
Step-by-Step AI Explanation
Verified Method
Among halogens, chlorine has the most negative electron-gain enthalpy, not the 'highest' in the sense implied here; fluorine is an exception in several periodic trends. The statement as written is taken as incorrect.
Q137mcq
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
a.
Fe
b.
Zn
c.
Mg
Correct Answer
d.
Cu
Step-by-Step AI Explanation
Verified Method
A metal whose oxide lies lower than Al2O3 in the Ellingham diagram can reduce alumina; Mg forms a more stable oxide and can reduce Al2O3.
Q138mcq
In the structure of ClF3, the number of lone pairs of electrons on central atom Cl is
a.
one
b.
two
Correct Answer
c.
four
d.
three
Step-by-Step AI Explanation
Verified Method
ClF3 has five electron pairs around chlorine (3 bond pairs and 2 lone pairs), giving a T-shaped structure.
Q139mcq
The correct order of atomic radii in group 13 elements is
a.
B < Al < In < Ga < Tl
b.
B < Al < Ga < In < Tl
c.
B < Ga < Al < Tl < In
d.
B < Ga < Al < In < Tl
Correct Answer
Step-by-Step AI Explanation
Verified Method
Due to poor shielding by d and f electrons, Ga is smaller than expected; the increasing order is B < Ga < Al < In < Tl.
Q140mcq
The correct order of N-compounds in decreasing order of oxidation states is
a.
HNO3, NO, N2, NH4Cl
Correct Answer
b.
HNO3, NO, NH4Cl, N2
c.
HNO3, NH4Cl, NO, N2
d.
NH4Cl, N2, NO, HNO3
Step-by-Step AI Explanation
Verified Method
Oxidation states of nitrogen are: HNO3 = +5, NO = +2, N2 = 0, NH4Cl = −3, so decreasing order is HNO3 > NO > N2 > NH4Cl.
Q141mcq
Which one of the following elements is unable to form M6-3 ion?
a.
Ga
b.
Al
c.
B
Correct Answer
d.
In
Step-by-Step AI Explanation
Verified Method
Boron cannot form the stable B3− ion due to its small size and high electron affinity constraints compared with heavier group 13 elements.
Q142mcq
The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether. A, B and C are in the order
a.
C2H5OH, C2H6, C2H5Cl
b.
C2H5OH, C2H5Cl, C2H5ONa
c.
C2H5Cl, C2H6, C2H5OH
d.
C2H5OH, C2H5ONa, C2H5Cl
Correct Answer
Step-by-Step AI Explanation
Verified Method
A must be ethanol. With Na it gives sodium ethoxide (B), and with PCl5 it gives ethyl chloride (C). B and C undergo Williamson ether synthesis to form diethyl ether.
Q143mcq
Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is
a.
CH≡CH
b.
CH2=CH2
c.
CH3–CH3
d.
CH4
Correct Answer
Step-by-Step AI Explanation
Verified Method
Only methane undergoes bromination by substitution to give CH3Br, which on Wurtz reaction gives ethane (C2H6), a gaseous hydrocarbon with fewer than four carbons.
Q143mcq
Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is
a.
CH≡CH
b.
CH2=CH2
c.
CH3–CH3
d.
CH4
Correct Answer
Step-by-Step AI Explanation
Verified Method
Methane undergoes substitution with bromine to form methyl bromide, which by Wurtz reaction gives ethane, a gaseous hydrocarbon with fewer than four carbon atoms.
Q144mcq
The compound C7H8 undergoes the following reactions:
The product ‘C’ is
a.
m-bromotoluene
b.
o-bromotoluene
c.
3-bromo-2,4,6-trichlorotoluene
d.
p-bromotoluene
Correct Answer
Step-by-Step AI Explanation
Verified Method
C7H8 is toluene. The methyl group is ortho/para-directing; bromination of toluene gives mainly the para product due to steric reasons.
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Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations:
a. 60 mL 10 M HCl + 40 mL 10 M NaOH
b. 55 mL 10 M HCl + 45 mL 10 M NaOH
c. 75 mL 5 M HCl + 25 mL 5 M NaOH
d. 100 mL 10 M HCl + 100 mL 10 M NaOH
pH of which one of them will be equal to 1?
a.
b
b.
a
c.
d
d.
c
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Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations:
a. 60 mL 10 M HCl + 40 mL 10 M NaOH
b. 55 mL 10 M HCl + 45 mL 10 M NaOH
c. 75 mL 5 M HCl + 25 mL 5 M NaOH
d. 100 mL 10 M HCl + 100 mL 10 M NaOH
pH of which one of them will be equal to 1?
a.
b
b.
a
c.
d
d.
c
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The solubility of BaSO4 in water is 2.42 × 10^-3 g L^-1 at 298 K. The value of its solubility product (Ksp) will be (Given molar mass of BaSO4 = 233 g mol^-1)
a.
1.08 × 10^-10 mol^2 L^-2
b.
1.08 × 10^-12 mol^2 L^-2
c.
1.08 × 10^-14 mol^2 L^-2
d.
1.08 × 10^-8 mol^2 L^-2
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Given van der Waals constant for NH3, H2, O2 and CO2 are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases is most easily liquefied?
a.
NH3
b.
H2
c.
O2
d.
CO2
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Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code:
Column I
a. Co3+
b. Cr3+
c. Fe3+
d. Ni2+
Column II
i. 8 B.M.
ii. 35 B.M.
iii. 3 B.M.
iv. 24 B.M.
v. 15 B.M.
a b c d
a.
iv v ii i
b.
i ii iii iv
c.
iv i ii iii
d.
iii v i ii
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Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s² 2s² 2p³, the simplest formula for this compound is
a.
Mg2X3
b.
MgX2
c.
Mg2X
d.
Mg3X2
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Compound A, C8H10O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively
a.
ethoxybenzene and iodine
b.
acetophenone and iodine
c.
ethyl phenyl ether and iodine
d.
1-phenylethanol and iodine
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The correct difference between first- and second-order reactions is that
a.
the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations
b.
the half-life of a first-order reaction does not depend on [A]0; the half-life of a second-order reaction does depend on [A]0
c.
a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed
d.
the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations
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Consider the change in oxidation state of bromine corresponding to different emf values as shown in the diagram below. Then the species undergoing disproportionation is
a.
Br3O−
b.
Br4O−
c.
Br2
d.
HBrO
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A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be
a.
1.4
b.
3.0
c.
2.8
d.
4.4
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A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4. The evolved gaseous mixture is passed through KOH pellets. The weight (in g) of the remaining product at STP will be
a.
1.4
b.
3.0
c.
2.8
d.
4.4
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The bond dissociation energies of X2, Y2 and XY are in the ratio 1 : 0.5 : 1. If ΔH for the formation of XY is −200 kJ mol−1, the bond dissociation energy of X2 will be
a.
200 kJ mol−1
b.
100 kJ mol−1
c.
800 kJ mol−1
d.
400 kJ mol−1
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