Chemistry Test 222

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Chemistry Test 222

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Weekly Quiz Competition

Question 1
4 / -1

Wilkinson catalyst is:

A
[(Ph₃P)₃RhCl] (Et = C₂H₅)

B
[Et₃P)₃IrCl]

C
[Et₃P)₃RhCl]

D
[Ph₃P)₃IrCl]

Solution

Wilkinsion catalyst is [(ph₃P)₃RhCl]
Question 2
4 / -1

Which of the following conditions in drinking water causes methemoglobinemia ?

A
> 50ppm of load

B
> 100 ppm of sulphate

C
> 50 ppm of chloride

D
> 50 ppm of nitrate

Solution

The concentration of nitrate > 50 ppm in drinking water causes methemoglobinemia which is a blood disorder in which an abnormal amount of methemoglobin is produced.
Question 3
4 / -1

The major product of the following reaction is:

A

B

C

D

Solution

During AES Br is o/p directing and major product will be formed on less hindrance p position.
Question 4
4 / -1

Correct statements among a to d regarding silicones are :

(A) They are polymers with hydrophobic character

(B) They are biocompatible.

(C) In general, they have high thermal stability and low dielectric strength.

(D) Usually, they are resistant to oxidation and are used as greases.

A
(A), (B) and (C) only

B
(A), and (B) only

C
(A), (B), (C) and (D)

D
(A), (B) and (D) only

Solution

Silicones are the polymer of silicon-containing [−(R)³Si−O−] linkage.

It is a polymer with hydrophobic character thus used in making water-resistant seals.

They are biocompatible.

They are thermally stable compounds and their stability comes from the high amount of energy required to break the Si−O and Si−Alkyl bonds. They also have high dielectric constant and that is why they are good insulators. So, the given statement (c) is not correct.

They are also resistant to oxidation. Because of wax-like texture, they are also used in greases.

Hence, the correct option is (d).
Question 5
4 / -1

For emission line of atomic hydrogen from ni to n_f= 8, the plot of wave number

(The Rydberg constant, RH is in wave number unit).

A
Linear with slope = - R_H

B
Linear with intercept = - R_H

C
Non linear

D
Linear with slope = R_H

Solution
Question 6
4 / -1

Two pi and half sigma bonds are present in:

A
N₂⁺

B
N₂

C
O₂⁺

D
O₂

Solution
Question 7
4 / -1

Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of the gas adsorbed on mass m of the adsorbent at pressure p. x/m is proportional to

A
P^1/4

B
P²

C
P

D
P^1/2

Solution
Question 8
4 / -1

The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are:

A
2 and 0

B
3 and 2

C
3 and 1

D
2 and 1

Solution
Question 9
4 / -1

0.5 moles of gas A and x moles of gas B exert a pressure of 200 Pa in a container of volume 10 m³ at 1000 K. given R is the gas constant in JK^-1 mol^-1 m, x is :

A

B

C

D

Solution
Question 10
4 / -1

In general, the properties that decrease and increase down a group in the periodic table, respectively, are:

A
electronegativity and electron gain enthalpy.

B
electronegativity and atomic radius.

C
atomic radius and electronegativity.

D
electron gain enthalpy and electronegativity.

Solution

The value of effective nuclear charge decreases down the group.

Hence, the electronegativity decreases and atomic radius increases on moving down the group.