Chromatographic technique/s based on the principle of differential adsorption is / are
A. Column chromatography
B. Thin layer chromatography
C. Paper chromatography
Choose the most appropriate answer from the options given below:
Answer
(C)
A & B only
13
Which of the following reaction is correct?
Answer
(C)
14
Anomalous behavior of oxygen is due to its
Answer
(B)
small size and high electronegativity
15
Which one of the following will show geometrical isomerism?
Answer
(A)
16
A reagent which gives brilliant red precipitate with Nickel ions in basic medium is
Answer
(A)
dimethyl glyoxime
17
Phenol treated with chloroform in presence of sodium hydroxide, which further hydrolyzed in presence of an acid results
Answer
(C)
2-Hydroxybenzaldehyde
18
Match List I with List II
List - I (Compound)
List - II ($$\mathrm{pK_a}$$ value)
(A)
Ethanol
(I)
10.0
(B)
Phenol
(II)
15.9
(C)
m-Nitrophenol
(III)
7.1
(D)
p-Nitrophenol
(IV)
8.3
Choose the correct answer from the options given below:
Answer
(C)
A-II, B-I, C-IV, D-III
19
The product A formed in the following reaction is
Answer
(C)
20
Alkyl halide is converted into alkyl isocyanide by reaction with
Answer
(D)
$$\mathrm{AgCN}$$
21
The total number of molecules with zero dipole moment among $$\mathrm{CH}_4, \mathrm{BF}_3, \mathrm{H}_2 \mathrm{O}, \mathrm{HF}, \mathrm{NH}_3, \mathrm{CO}_2$$ and $$\mathrm{SO}_2$$ is ________.
Answer
3
22
Standard enthalpy of vapourisation for $$\mathrm{CCl}_4$$ is $$30.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$$. Heat required for vapourisation of $$284 \mathrm{~g}$$ of $$\mathrm{CCl}_4$$ at constant temperature is ________ $$\mathrm{kJ}$$.
(Given molar mass in $$\mathrm{g} \mathrm{mol}^{-1} ; \mathrm{C}=12, \mathrm{Cl}=35.5$$)
Answer
56
23
If $$50 \mathrm{~mL}$$ of $$0.5 \mathrm{M}$$ oxalic acid is required to neutralise $$25 \mathrm{~mL}$$ of $$\mathrm{NaOH}$$ solution, the amount of $$\mathrm{NaOH}$$ in $$50 \mathrm{~mL}$$ of given $$\mathrm{NaOH}$$ solution is ______ g.
Answer
4
24
The following concentrations were observed at $$500 \mathrm{~K}$$ for the formation of $$\mathrm{NH}_3$$ from $$\mathrm{N}_2$$ and $$\mathrm{H}_2$$. At equilibrium ; $$\left[\mathrm{N}_2\right]=2 \times 10^{-2} \mathrm{M},\left[\mathrm{H}_2\right]=3 \times 10^{-2} \mathrm{M}$$ and $$\left[\mathrm{NH}_3\right]=1.5 \times 10^{-2} \mathrm{M}$$. Equilibrium constant for the reaction is ________.
Answer
417
25
A constant current was passed through a solution of $$\mathrm{AuCl}_4^{-}$$ ion between gold electrodes. After a period of 10.0 minutes, the increase in mass of cathode was $$1.314 \mathrm{~g}$$. The total charge passed through the solution is _______ $$\times 10^{-2} \mathrm{~F}$$.
(Given atomic mass of $$\mathrm{Au}=197$$)
Answer
2
26
The total number of anti bonding molecular orbitals, formed from $$2 s$$ and $$2 p$$ atomic orbitals in a diatomic molecule is _______.
Answer
4
27
The half-life of radioisotope bromine - 82 is 36 hours. The fraction which remains after one day is ________ $$\times 10^{-2}$$.
(Given antilog $$0.2006=1.587$$)
Answer
63
28
The total number of 'Sigma' and 'Pi' bonds in 2-formylhex-4-enoic acid is _________.
Answer
22
29
The oxidation number of iron in the compound formed during brown ring test for NO$$_3^-$$ iron is ________.
Answer
1
30
Molality of 0.8 M H$$_2$$SO$$_4$$ solution (density 1.06 g cm$$^{-3}$$) is ________ $$\times10^{-3}$$ m.
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