Chemistry Test - 35

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Chemistry Test - 35

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Weekly Quiz Competition

Question 1
1 / -0

For a chemical reaction X→Y, the rate of reaction increases by a factor of 1.837 when the concentration of X is increased by 1.5 times. The order of the reaction with respect to X is

A
1

B
1.5

C
2

D
2.5

Solution

$(1.5)^{n} = 1.837, n = \frac{\log 1.837}{\log 1.5} = 1.5$
Question 2
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The intermediate for mad during the addition of HCl to propene in the presence of peroxide is

A
$C H_{3} \dot{C} H C H_{2} C l$

B
$C H_{3} \overset{\oplus}{C} H C H_{3}$

C
${CH}_{3} {CH}_{2} \dot{C} H_{2}$

D
$C H_{3} C H_{2} \overset{\oplus}{C} H_{2}$

Solution

The reaction proceed through Markownikoff's rule by ionic mechanism. The initial carbonium ion $\left(C H_{3} C H_{2} C^{+} H_{2}\right)$ rearrange into more stable $\left(C H_{3}C^{+} H C H_{3}\right)$ carbonium ion.
Question 3
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RCONH₂ + 4NaOH + Br₂ → RNH₂ + 2NaBr + Na₂CO₃ + 2H₂O Reaction is said

A
Hofmann-bromamide reaction

B
Schmidt reaction

C
Curtius reaction

D
Beckmann reaction.

Solution

this reaction is called Hofmann-bromamide reaction.
Question 4
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The reaction of with HBr gives

A

B

C

D

Solution

bromination occurs on 3rd $\mathrm{C}$ atom

Hence correct answer is option B
Question 5
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Which one of the following is an example of co-ordination isomerism?

A

B

C

D

Solution

This type of isomerism occurs when both action and anion are complex. The
isomerism is caused by that interchange of ligands between the two complex ion of the same complex. Examples are (i)
Question 6
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A solution containing As³⁺, Cd²⁺, Ni²⁺ and Zn²⁺ is made alkaline with dilute NH₄OH and treated with H₂S.. The precipitate obtained will consist of

A
As₂S₃ and CdS

B
CdS, NiS and ZnS

C
NiS and ZnS

D
Sulphide of all ions

Solution

$A s^{3+}$ and $C d^{2+}$ are the radicals of group $\|,$ whereas $N i^{2+} \& Z n^{2+}$ are the radicals
of group IV. The solubility product of group IV radicals is higher as compared to group
II. $N H_{4} O H$ increases the ionisation of $H_{2} S$ by removing $H^{+}$ of $H_{2} S$ as unionisable water. $H_{2} S 2 H^{+}+S^{2-} ; H^{+}+O H^{-} \rightarrow H_{2} O$ Thus, excess of
sulphide ions are present which leads to the precipitation of all the four ions. Note:
HCl decreases ionisation of $H_{2} S$ whereas $N H_{4} O H$ increases the ionisation of $H_{2} S$
Question 7
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Final product formed in the following reaction sequence is

A
Naphthalene

B
Tetralin

C
Benzene

D
Anthracene

Solution
Question 8
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Which of the following statements is incorrect about elimination reaction?

A
Reaction follows E₁ path

B
Rate= k[Bromide]¹[KOH]^∘

C
Reaction is stereo specific

D
Reaction is stereo selective

Solution

$3^{\circ}$ halide in alcoholic $\mathrm{KOH}$ prefers $\mathrm{E}_{1}$ path

II product is the major product and the reaction is stereo selective not stereo specific
Question 9
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What weight of ammonia contains the same number of molecules as 11.2 L of oxygen at STP?

A
17 g

B
8.5 g

C
16 g

D
8 g

Solution

since $11.2 \mathrm{Lof} \mathrm{O}_{2} \mathrm{gas}$ contain half mole ie, $\mathrm{N} / 2$ molecules, hence half mole of $\mathrm{NH}_{3}$ will weigh $=\frac{\text {molecular weight}}{2}=\frac{17}{2}=8.5 g$
Question 10
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Di-n-propyl ether and diallyl ether can be distinguished by

A
Acetic acid

B
Sodium Metal

C
Cold dilute KMnO₄ solution

D
PCl₅

Solution

Diallyl ether has double bond which shows addition reaction with KMn04 (change its colour) while di-n-propyl ether does not react with KMnO₄.