Chemistry Test 112

Result

Chemistry Test 112

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Weekly Quiz Competition

Question 1
4 / -1

Select the INCORRECT statement among given :

A
All bond lengths are equal in (X).

B
PH₃ is also formed along with (Y).

C
SO₂ is only byproduct formed with (X) in reaction of P₄ with SOCl₂.

D
Oxidation state of phosphorus in oxyacid of phosphorus (Y) is +5.

Solution
Question 2
4 / -1

Which compound is expected to have highest pKa value ?

A
CH₃CH₂COOH

B

C
CF₃–CH₂–COOH

D
CH₃–CF₂–COOH
Question 3
4 / -1

A photon of energy hν is absorbed by a free electron of a metal having work function w < hν. Then:

A
The electron is sure to come out.

B
The electron is sure to come out with a kinetic energy (hν - w).

C
Either the electron does not come out or it comes with a kinetic energy (hν - w).

D
It may come out with a kinetic energy less than (hν - w).

Solution

Informational
Question 4
4 / -1

Correct statement regarding orthoboric acid is :

A
It is a Lewis acid whose pKa is –1.

B
It is a triprotic, weak Bronsted acid.

C
There exist H-bonds in between layers in its crystalline form.

D
Cis-diols can be used to increase acidic strength in its aq. solution.

Solution
Question 5
4 / -1

Which of the following amine forms N-nitrosoamine upon treatment with NaNO₂ & HCl ?

A

B
Aniline

C

D

Solution

2° amines form N-nitrosoamine upon treatment with NaNO₂ & HCl.
Question 6
4 / -1

The compression factor (compressibility factor) for one mole of a vander Waals gas at 0° C and 100 atmosphere pressure is found to be 0.5. Assuming that the volume of a gas molecule is negligible, calculate the vander waals constant 'a'.

A
1.2544 atm L² mol^–2

B
125.44 atm L² mol^–2

C
12.544 atm L² mol^–2

D
2.50 atm L² mol^–2

Solution
Question 7
4 / -1

Co-ordinated as well as hydrogen bonded water are present in :

A
BaCl₂.2H₂O

B
[Cr(H₂O)₆]Cl₃

C
CuSO₄.5H₂O

D
All of these

Solution

BaCl₂.2H₂O : interstitial water

[Cr(H₂O)₆]Cl₃ : co-ordinated water
Question 8
4 / -1

In the reaction

Maximum extent of hofmann alkene product will be obtained when X is-

A
1

B
Br

C
Cl

D
F
Question 9
4 / -1

When 20 g of naphtholic acid (C₁₁H₈O₂) is dissolved in 50 g of benzene (K_f = 1.72 K kg mol^–1), a freezing point depression of 2 K is observed.

The van’t Hoff factor (i) is

A
0.5

B
1

C
2

D
3

Solution
Question 10
4 / -1

The correct properties of dilute solution of sodium metal in excess of aq. NH₃ is :

A
Paramagnetic, blue coloured

B
Diamagnetic, bronze coloured

C
Diamagnetic, colourless

D
Paramagnetic, colourless

Solution