Chemistry Test 181

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Chemistry Test 181

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Weekly Quiz Competition

Question 1
4 / -1

Which one of the following is the correct statement?

A
Boric acid is a protonic acid

B
Beryllium exhibits coordination number of six

C
Chlorides of both beryllium and aluminium have bridged structures in solid phase

D
B₂H₆.2NH₃ is known as ‘inorganic benzene’

Solution

The correct formula of inorganic benzene is B₃N₃H₆ so

(d) is incorrect statement

Boric acid

is a lewis acid so (a) Is incorrect statement

The coordination number exhibited by beryllium is 4 and not 6 so statement (b) is incorrect.

Both BeCl₂ and AlCl₃ exhibit bridged structure is solid state so

(c)is correct statement
Question 2
4 / -1

Which of the following sequence of T and F is correct for given statements. Here T stands for correct and F stands for false statement

(i) The more the number of contributing structures, the more is the resonance energy.

(ii) The resonance structures have different positions of nuclei but same number of unpaired electrons

(iii) The energy of actual structure of the molecule (the resonance hybrid) is lower than that of any of the canonical structures.

A
TTT

B
TFT

C
FFF

D
TFF

Solution

The resonance structures have same positions of nucleiand same number of unpaired electrons.
Question 3
4 / -1

In the following reaction, the major product is

A

B

C

D

Solution
Question 4
4 / -1

Carbon monoxide (CO) is harmful to man because

A
it forms carbolic acid

B
it generates excess CO₂

C
it is carcinogenic

D
it competes with O₂ for haemoglobin

Solution

CO is highly toxic and impairs respiration. CO combine with haemoglobin of blood and reduces its O2 carry capacity.
Question 5
4 / -1

How many unit cells are present in a cube-shaped ideal crystal of NaCl of mass 1.00 g ? [Atomic masses : Na = 23, Cl = 35.5]

A

B

C

D

Solution
Question 6
4 / -1

Which of the following 0.10 m aqueous solutions will have the lowest freezing point ?

A
Al₂(SO₄)₃

B
C₆H₁₂O₆

C
KCl

D
C₁₂H₂₂O₁₁

Solution
Question 7
4 / -1

The mathematical expression for law of independent migration of ions and Ostwald’s dilution law are given by

A

B

C

D

Solution

At infinite dilution each ion makes a definite contribution towards molar conductance which is given by
Question 8
4 / -1

The slope in Arrhenius plot, is equal to

A

B

C

D

Solution
Question 9
4 / -1

In Langmuir's model of adsorption of a gas on a solid surface

A
the mass of gas striking a given area of surface is proportional to the pressure of the gas

B
the mass of gas striking a given area of surface is independent of the pressure of the gas

C
the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered

D
the adsorption at a single site on the surface may involve multiple molecules at the same time

Solution

According to Langmuir’s model of adsorption of a gas on a solid surface the mass of gas adsorbed(x) per gram of the adsorbent (m) is directly proportional to the pressure of the gas (p) at constant temperature i.e.
Question 10
4 / -1

Which process represents the change,

A
Cupellation

B
Van Arkel

C
Polling

D
Zone Refining

Solution

The given reaction is the method named as Van Arkel for the purification of titanium.