Chemistry Test

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Chemistry Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Nitro-aci tautomerism is exhibited by

A
nitrobenzene

B
nitromethane

C
chloropicrin

D
o-toluidine

Solution

Nitro-aci tautomerism: It is exhibited by nitro compounds containing at least one α-hydrogen. In this case also, the hydrogen atom is transferred completely from one atom to another during the conversion of nitro form to aci form and vice versa. Example: The nitro-aci tautomerism exhibited by nitromethane is shown below.
Question 2
1 / -0

How is the product formed in the above reaction?

A
Michael addition followed by aldol condensation

B
Aldol condensation followed by Michael addition

C
Mannich reaction

D
Knoevenagel reaction followed by aldol condensation

Solution
Question 3
1 / -0

Which of the following is bacteriostatic?

A
Penicillin

B
Erythromycin

C
Amino glycodine

D
Ofloxacin

Solution

A bacteriostatic agent is a chemical agent that stops bacteria from reproducing, while not necessarily killing them. Erythromycin displays bacteriostatic activity or inhibits growth of bacteria, especially at higher concentrations while penicillin, amino glycodine, ofloxacin are bactericidal, that kill the bacteria.
Question 4
1 / -0

A mixture of Al and Zn weighing 1.67 g was completely dissolved in acid, and the evolved 1.69 litres of hydrogen gas was measured at 273 K and one atmosphere pressure. The respective masses of Al and Zn in the original mixture were

A
1.25 g, 0.42 g

B
0.42 g, 1.25 g

C
1.25 g, 4.2 g

D
12.5 g, 4.2 g

Solution
Question 5
1 / -0

Which of the following alkenes will react faster with H₂ under catalytic hydrogenation conditions?

A

B

C

D

Solution

The following order of stability of alkenes has been derived from heat of hydrogenation:

R₂C=CR₂ > R₂C=CHR > R₂C=CH₂ = trans-RCH=CHR > cis-RCH=CHR > RCH=CH₂ > CH₂=CH₂

The reactivity order is reverse of the stability order.
Question 6
1 / -0

₈₄Rn²¹⁹ is a member of actinium series. Which of the following is another member of this series?

A
₈₉Ac²²⁵

B
₉₀Th²³²

C
₁₅P³⁴

D
₉₂U²³⁵

Solution
Question 7
1 / -0

For the coagulation of ferric hydroxide solution, what will be the increasing order of effectiveness of the given electrolytes?

(a) SnCl₄

(b) CaSO₄

(c) AlPO₄

(d) K₄Fe(CN)₆

A
(a), (b, (c), (d)

B
(d), (c), (b), (a)

C
(b), (c), (a), (d)

D
(d), (b), (a), (c)

Solution

Ferric hydroxide forms a positive sol and thus, the anion of the electrolyte is the active ion, required to coagulate it. The coagulating power will be in the order of the net negative charge on the ions:

Cl- < SO₄^2- < PO₄^3- < [Fe(CN)₆]^4-
Question 8
1 / -0

Which of the following is not aromatic?

A
Cyclopentadienyl cation

B
Cyclopentatrienyl cation

C
Cyclopentadienyl anion

D
Antracene

Solution

Cyclopentadienyl cation is not aromatic as it contains only 4 pi electrons. So, it does not follow (4n + 2) pi electron rule.
Question 9
1 / -0

Cesium chloride unit cell is a simple cubic unit cell. The centre of the unit cell is occupied by an ion of opposite charge. If the density of CsCl is 3.988 g cm^-3, which of the following statements is true? [Atomic mass of Cs = 132.9 u, atomic mass of Cl = 35.5 u]

A

B

C

D
Unit cube can be considered as a body-centred cubic lattice.

Solution
Question 10
1 / -0

A compound of Xe and F is found to have 53.5% Xe. What is the oxidation number of Xe in this compound?

(At. wt. of Xe = 131, F = 19)

A
-6

B
+6

C
-4

D
+4

Solution