M.C.Q (1 Marks)

Question 11 Mark

Match the properties given in column $I$ with the metals in column $II$

Column $I$	Column $II$
$(1)$ Actinoid having configuration $(RN)5f^76d^17s^2$	$(A) \ Ce$
$(2)$ Lanthanoid which has $4f^{14}$ electronic configuration in $+3$ oxidation state.	$(B) \ Lu$
$(3)$ Lanthanoid which show $+4$ Oxidation state	$(C) \ Cm$

Answer

$(1)-(C), (2)-(B), (3)-(A)$

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Question 21 Mark

Ammonolysis of ethyl chloride followed by reaction of the amine so formed with 1 mole of methyl chloride gives an amine that

Answer

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Question 31 Mark

'X' and 'Y' in the above table are

Answer

(b) $\mathrm{X}=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+} \mathrm{Cl}^{-}, \quad \mathrm{Y}=1: 3$

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Question 41 Mark

Which of the following compound gives an oxime with hydroxylamine:

Answer

$\ce{CH_3COCH_3}$
Aldehyde and ketones give nucleophilic addition reactions.
Other carbonyl compounds do not give nucleophilic addition reactions.

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Question 51 Mark

Which one of the following has the highest dipole moment?

Answer

(b)CH3Cl
The order followed is this CH3I<CH3Br<CH3F< CH3Cl, though F is most electronegative, the bond length is small as compared to C-Cl. Dipole moment is the product of the charge and the bond length.

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Question 61 Mark

A student was preparing aniline in the lab. She took a compound "X" and reduced it in the presence of Ni as a catalyst. What could be the compound "X"

Answer

(a) Nitrobenzene

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Question 71 Mark

A first$-$order reaction is found to have a rate constant, $k = 5.5 \times 10^{-1}4s^{-1}.$The time taken for completion of the reaction is:

Answer

It never goes to completion First order reaction $[R] = [Ro] e^{-kt} If [R]=0$
then $e^{- kt} = 0$ which is not possible for any finite value of $t.$
Here, $t$ is $\infty$ .

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Question 81 Mark

Which one of the following sets correctly represents the increase in the paramagnetic property of the ions?

Answer

No. of unpaired electrons $\ce{Ti^{3+}(1), Cr^{3+}(3), Fe^{2+ }(4)}$ and $\ce{Mn^{2+} (5)}$ Paramagnetism depends on the number of unpaired electrons

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Question 91 Mark

Which of the following contains only ẞ-D- glucose as its monosaccharide unit:

Answer

(b) Cellulose
Starch contains only a glucose, sucrose contains α-D-glucose and ß-D-fructose glucose, maltose contains α-D-glucose and cellulose is a polymer of ß-D-glucose.

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Question 101 Mark

When $\ce{C_6H_5COOCOCH_2}$ is treated with $\ce{H_2O},$ the product obtained is:

Answer

$\ce{C_6H_5COOCOCH_3 H_2O C_6H_5COOH + CH_3COOH}$

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Question 111 Mark

The initial concentration of $R$ in the reaction $R\rightarrow\ \text{P IS}\ 4.62 \times 10^{-2} \text{mol/ L}$ What is the half life for the reaction if $k = 2.31 \times 10^{-2} \text {mol/ L} ^{-1}S^{-1}$

Answer

the order of reaction is zero as the unit of $k$ is $\text{moll}^{-1}s^{-1}.$
Thus half life $= [R]^\circ / 2k = 4.62 \times 10^{-2}/2 \times 2.31 \times 10^{-2}$

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Question 121 Mark

Study the graph showing the boiling points of bromoalkanes and identify the compounds.

Answer

(d) 1 =Bromomethane, 2= 2-Bromo-2-methylpropane, 3=2- Bromobutane, 4= 1-Bromobutane

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Chemistry M.C.Q (1 Marks)

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