The number of protons, neutrons and electrons in ^175_71Lu, respectively, are:
a.
175, 104 and 71
b.
71, 104 and 71
Correct Answer
c.
104, 71 and 71
d.
71, 71 and 104
Step-by-Step AI Explanation
Verified Method
For ^175_71Lu, atomic number = 71, so protons = 71 and electrons = 71 in a neutral atom. Neutrons = 175 - 71 = 104.
Q4mcq
Which one of the followings has maximum number of atoms?
a.
1 g of Li(s) [Atomic mass of Li = 7]
Correct Answer
b.
1 g of Ag(s) [Atomic mass of Ag = 108]
c.
1 g of Mg(s) [Atomic mass of Mg = 24]
d.
1 g of O2(g) [Atomic mass of O = 16]
Step-by-Step AI Explanation
Verified Method
Number of atoms is proportional to number of moles. For 1 g: Li = 1/7 mol atoms, Mg = 1/24 mol atoms, Ag = 1/108 mol atoms, and O2 gives 1/32 mol molecules = 2/32 mol atoms = 1/16 mol atoms. Highest is Li.
Q5mcq
Paper chromatography is an example of:
a.
Column chromatography
b.
Adsorption chromatography
c.
Partition chromatography
Correct Answer
d.
Thin layer chromatography
Step-by-Step AI Explanation
Verified Method
In paper chromatography, separation occurs due to differential partitioning of components between the stationary water held in cellulose fibers and the mobile solvent phase.
Q6mcq
Which of the following is a natural polymer?
a.
Poly(butadiene-acrylonitrile)
b.
cis-1,4-polyisoprene
Correct Answer
c.
Poly(butadiene-styrene)
d.
Polybutadiene
Step-by-Step AI Explanation
Verified Method
cis-1,4-polyisoprene is natural rubber, a naturally occurring polymer. The others are synthetic rubbers/polymers.
Q6mcq
Which of the following is a natural polymer?
a.
poly(butadiene-acrylonitrile)
b.
cis-1,4-polyisoprene
Correct Answer
c.
poly(butadiene-styrene)
d.
polybutadiene
Step-by-Step AI Explanation
Verified Method
cis-1,4-polyisoprene is natural rubber, a natural polymer.
Q7mcq
The mixture which shows positive deviation from Raoult’s law is:
a.
Chloroethane + bromoethane
b.
Ethanol + acetone
Correct Answer
c.
Benzene + toluene
d.
Acetone + chloroform
Step-by-Step AI Explanation
Verified Method
Positive deviation occurs when A-B interactions are weaker than A-A and B-B interactions. Ethanol + acetone shows weaker interactions and hence positive deviation.
Q7mcq
The mixture which shows positive deviation from Raoult’s law is:
a.
Chloroethane + bromoethane
b.
Ethanol + acetone
Correct Answer
c.
Benzene + toluene
d.
Acetone + chloroform
Step-by-Step AI Explanation
Verified Method
Positive deviation occurs when A-B interactions are weaker than A-A and B-B interactions. Ethanol + acetone shows weaker intermolecular attraction compared with pure ethanol due to disruption of hydrogen bonding. Acetone + chloroform shows negative deviation.
Q8mcq
The calculated spin-only magnetic moment of Cr3+ ion is:
a.
2.84 BM
Correct Answer
b.
3.87 BM
c.
4.90 BM
d.
5.92 BM
Step-by-Step AI Explanation
Verified Method
Cr3+ is d3, so n = 3 unpaired electrons. Spin-only moment = √{n(n+2)} = √{3×5} = √15 ≈ 3.87 BM. However the options indicate the standard NEET value for d3 is 3.87 BM, so the correct choice is b.
Q8mcq
The calculated spin-only magnetic moment of Cr3+ ion is:
a.
2.84 BM
Correct Answer
b.
3.87 BM
c.
4.90 BM
d.
5.92 BM
Step-by-Step AI Explanation
Verified Method
Cr has configuration [Ar] 3d5 4s1. Cr3+ becomes 3d3, so n = 3 unpaired electrons. Spin-only magnetic moment = sqrt(n(n+2)) = sqrt(3×5) = sqrt(15) ≈ 3.87 BM. However, the printed ion is likely Cr2+ or the intended answer may be based on Cr3+? Since the options include 3.87 BM for 3 unpaired electrons and 2.84 BM for 2 unpaired electrons, the correct Cr3+ value is 3.87 BM.
Q9mcq
A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?
a.
Hyperconjugation
Correct Answer
b.
−I effect of −CH3 groups
c.
+I effect of −CH3 groups
d.
−R effect of −CH3 groups
Step-by-Step AI Explanation
Verified Method
Tertiary carbocations are stabilized by greater hyperconjugation and +I effect from alkyl groups. Among the given options, hyperconjugation is the key reason.
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Identify the correct statements from the following:
(a) CO2(g) is used as refrigerant for ice-cream and frozen food.
(b) The structure of C60 contains twelve six-membered rings and twenty five-ring carbons.
(c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline.
(d) CO is a colorless and odourless gas.
a.
(c) and (d) only
b.
(a), (b) and (c) only
c.
(a) and (c) only
d.
(b) and (c) only
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Hydrolysis of sucrose is given by the following reaction:
Sucrose + H2O ⇌ Glucose + Fructose
If the equilibrium constant (Kc) is 2 × 10^13 at 300 K, the value of ΔrG° at the same temperature will be:
a.
−8.314 J mol−1 K−1 × 300 K × ln(4 × 10^13)
b.
−8.314 J mol−1 K−1 × 300 K × ln(2 × 10^13)
c.
8.314 J mol−1 K−1 × 300 K × ln(2 × 10^13)
d.
8.314 J mol−1 K−1 × 300 K × ln(3 × 10^13)
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Match the following:
Oxide — Nature
(a) CO — (i) Basic
(b) BaO — (ii) Neutral
(c) Al2O3 — (iii) Acidic
(d) Cl2O7 — (iv) Amphoteric
Which of the following is the correct option?
a.
(iv), (iii), (ii), (i)
b.
(i), (ii), (iii), (iv)
c.
(ii), (i), (iv), (iii)
d.
(iii), (iv), (i), (ii)
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Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+(aq), deep blue colour solution C is formed. What is the formula of C from the following?
a.
CuCO3·Cu(OH)2
b.
CuSO4
c.
[Cu(NH3)4]2+
d.
Cu(OH)2
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The freezing point depression constant (Kf) of benzene is 5.12 K kg mol−1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off up to two decimal places):
a.
0.60 K
b.
0.20 K
c.
0.80 K
d.
0.40 K
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The freezing point depression constant (Kf) of benzene is 5.12 K kg mol−1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places):
a.
0.60 K
b.
0.20 K
c.
0.80 K
d.
0.40 K
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The oxidation states of chromium in CrO4^2− and Cr2O7^2− are not the same.
b.
Cr2+ (d4) is a stronger reducing agent than Fe2+ (d6) in water.
c.
The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
d.
Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
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A mixture of N2 and Ar gases in a cylinder contains 7 g of N2 and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of N2 is: [Use atomic masses (in g mol−1): N = 14, Ar = 40]
a.
18 bar
b.
9 bar
c.
12 bar
d.
15 bar
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