#Q20 Which one of the following interactions plays a major role in stabilizing B-DNA ?
Anonymous Quiz
52%
Hydrogen bond
28%
Hydrophobic interactions
16%
Van der Wall’s interactions
4%
Ionic interactions
🥰6❤4🎉2
#Q21 The maximum number of hydrogen bonds that can form between H2N - NH2 (hydrazine) and water is
Anonymous Quiz
30%
2
16%
1
23%
3
31%
4
❤7🥰3
#Q23 In a hydrogen bond of the type D-H...A, where D-H is a weakly acidic donor group and A is a lone-pair-bearing acceptor atom, the D...A distance is
Anonymous Quiz
23%
one-and-a-half times the sum of the van Der Waals radii.
32%
equal to the sum of the van Der Waals radii.
36%
less than the sum of the van Der Waals radii.
9%
twice the sum of the van Der Waals radii.
#Q24 On the molar scale which of the following interaction in a nonpolar environment provides the highest contribution to the bio-molecule?
Anonymous Quiz
15%
van der Walls interaction
30%
Hydrogen bonding
20%
Salt bridge
35%
Hydrophobic interaction
❤2👍2🎉1
#Q25 The free energy ∆G of a dissolved solute
Anonymous Quiz
29%
Increases with solute concentration.
36%
decreases with solute concentration
28%
is independent of solute concentration.
8%
depends only on temperature.
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#Q26 Which one of the following non-covalent interactions between two non-bonded atoms A and B is most sensitive to the distance between them ?
Anonymous Quiz
26%
A and B are permanent dipoles and are involved in hydrogen bonding.
38%
A and B are fully ionized and are involved in salt bridge formation.
29%
A and B are uncharged and repel each other.
8%
A and B are uncharged and attract each other.
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#Q22 Out of the following hydrogen bonding schemes shown by ... which one corresponds to the weakest hydrogen bond in a given solvent condition ?
Anonymous Quiz
14%
O-H …O<
38%
N-H…H<
21%
O-H…N<
27%
N-H…N<
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#Q27 Equal volumes of pH 4.0 and pH 10.0 solutions are mixed. What will be the approximate pH of the final solution ?
Anonymous Quiz
41%
7.0
21%
5.0
29%
6.0
9%
4.0
#Q28 100 ml of 0.02 M acetic acid (pKa= 4.76) is titrated with 0.02 N KOH. After adding some base to the acid solution, the observed pH is 2.76. At this pH degree of protonation is
Anonymous Quiz
7%
0%
42%
10%
35%
90%
15%
99%
#Q29 100 ml of 0.1 M sodium acetate solution has a pH of 8.90. To this solution 1000 μl of 1M acetic acid (pKa = 4.76) of pH 2.80 is added. The pH of this mixture will be:
Anonymous Quiz
17%
8.90
37%
4.76
25%
2.80
21%
5.76
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Nov_2020_Shift_2_CSIR_NET_LS_Question_Paper_With_Answer_Key.pdf
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Dec_2019_A&M_CSIR_NET_LS_Question_Paper_With_Answer_Key.pdf
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Dec 2019 CSIR NET LS Question Paper With Answer Key.pdf
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June 2019 CSIR NET LS Question Paper With Answer Key.pdf
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Dec 2018 CSIR NET LS Question Paper With Answer Key.pdf
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