In gel electrophoresis, separated DNA fragments can be visualized with the help of
a.
Acetocarmine in bright blue light
b.
Ethidium bromide in UV radiation
Correct Answer
c.
Acetocarmine in UV radiation
d.
Ethidium bromide in infrared radiation
Step-by-Step AI Explanation
Verified Method
DNA fragments stained with ethidium bromide fluoresce under UV light, allowing visualization.
Q21mcq
The specific palindromic sequence which is recognized by EcoRI is
a.
5′-GAATTC-3′
3′-CTTAAG-5′
Correct Answer
b.
5′-GGAACC-3′
3′-CCTTGG-5′
c.
5′-CTTAAG-3′
3′-GAATTC-5′
d.
5′-GGATCC-3′
3′-CCTAGG-5′
Step-by-Step AI Explanation
Verified Method
EcoRI recognizes the palindromic sequence GAATTC and cuts between G and A.
Q22mcq
Identify the wrong statement with regard to Restriction Enzymes.
a.
Each restriction enzyme functions by inspecting the length of a DNA sequence.
Correct Answer
b.
They cut the strand of DNA at palindromic sites.
c.
They are useful in genetic engineering.
d.
Sticky ends can be joined by using DNA ligases.
Step-by-Step AI Explanation
Verified Method
Restriction enzymes recognize specific nucleotide sequences, not the length of DNA.
Q91mcq
Identify a molecule which does not exist.
a.
He2
Correct Answer
b.
Li2
c.
C2
d.
O2
Step-by-Step AI Explanation
Verified Method
He2 does not exist as a stable molecule because helium has a complete valence shell and does not form a stable bond.
Q92mcq
Find out the solubility of Ni(OH)2 in 0.1 M NaOH. Given that the ionic product of Ni(OH)2 is 2 × 10^-15.
a.
2 × 10^-13 M
Correct Answer
b.
2 × 10^-8 M
c.
1 × 10^-13 M
d.
1 × 10^8 M
Step-by-Step AI Explanation
Verified Method
For Ni(OH)2, Ksp = [Ni2+][OH-]^2. In 0.1 M NaOH, [OH-] ≈ 0.1 M, so solubility s = Ksp/(0.1)^2 = 2 × 10^-15 / 10^-2 = 2 × 10^-13 M.
Q93mcq
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 carbon rings.
(c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline.
(d) CO is a colorless and odourless gas.
a.
(a), (b) and (c) only
b.
(a) and (c) only
c.
(b) and (c) only
d.
(c) and (d) only
Correct Answer
Step-by-Step AI Explanation
Verified Method
ZSM-5 is used to convert alcohols into gasoline, and CO is colorless and odourless. The C60 statement is incorrect because fullerene has 12 pentagons and 20 hexagons.
Q94mcq
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:
Using ΔrG° = −RT ln Kc, the correct expression is −8.314 × 300 × ln(2 × 10^13).
Q95mcq
Identify compound X in the following sequence of reactions:
CH3Cl / hν → X → HO2, 373 K → CHO
a.
Cl
b.
CHCl2
c.
CHCl2
Correct Answer
d.
CCl3
Step-by-Step AI Explanation
Verified Method
Successive chlorination of methane derivative followed by hydrolysis leads to chloroform-related intermediate; X is CHCl2 as per the intended reaction sequence.
Q96mcq
Identify the incorrect match.
Name IUPAC official name
(a) Unnilunium (i) Mendelevium
(b) Unniltrium (ii) Lawrencium
(c) Unnilhexium (iii) Seaborgium
(d) Unununnium (iv) Darmstadtium
a.
(a), (i)
b.
(b), (ii)
c.
(c), (iii)
d.
(d), (iv)
Correct Answer
Step-by-Step AI Explanation
Verified Method
Unununnium corresponds to element 111, which is Roentgenium, not Darmstadtium.
Q98mcq
Which of the following set of molecules will have zero dipole moment?
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.
0.20 K
b.
0.80 K
c.
0.40 K
d.
0.60 K
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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:
a.
9 bar
b.
12 bar
c.
15 bar
d.
18 bar
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Elimination reaction of 2-bromopentane to form pent-2-ene is
(a) β-elimination reaction
(b) Follows Zaitsev rule
(c) Dehydrohalogenation reaction
(d) Dehydration reaction
Which of the following is correct?
a.
(a), (b), (c)
b.
(a), (c), (d)
c.
(b), (c), (d)
d.
(a), (b), (d)
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The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and, with Na, is responsible for the transmission of nerve signals.
a.
Iron
b.
Copper
c.
Calcium
d.
Potassium
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Cr2+ (d4) is a stronger reducing agent than Fe2+ (d6) in water.
b.
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.
c.
Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
d.
The oxidation states of chromium in CrO4^2− and Cr2O7^2− are not the same.
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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.
CuSO4
b.
[Cu(NH3)4]2+
c.
Cu(OH)2
d.
CuCO3·Cu(OH)2
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Match the following and identify the correct option.
(a) CO(g) + H2(g)
(b) Temporary hardness of water
(c) B2H6
(d) H2O2
(i) Mg(HCO3)2 + Ca(HCO3)2
(ii) An electron deficient hydride
(iii) Synthesis gas
(iv) Non-planar structure
a.
(a) (b) (c) (d) = (iii) (i) (ii) (iv)
b.
(a) (b) (c) (d) = (iii) (ii) (i) (iv)
c.
(a) (b) (c) (d) = (iii) (iv) (ii) (i)
d.
(a) (b) (c) (d) = (i) (iii) (ii) (iv)
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