Chemistry Test 216

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Chemistry Test 216

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Weekly Quiz Competition

Question 1
4 / -1

The inert pair effect is most prominent in

A
C

B
Ge

C
Pb

D
Si

Solution

The inert pair effect is most prominent in the heavier members of the group. Inert pair effect increases as we move the group down the group.
Question 2
4 / -1

Ligands in a complex salt are

A
anions linked by coordinate bonds to a central metal atom or ion

B
cations linked by coordinate bonds to a central metal or ion

C
molecules linked by coordinate bonds to a central metal or ion

D
ions or molecules linked by coordinate bonds to a central atom or ion
Solution
Option D is correct.
- Ligand is an ion or molecule that donates one or more lone pairs of electrons to a central metal atom or ion to form a coordinate bond.
- Common examples include neutral ligands such as NH3, H2O and CO, and anionic ligands such as Cl^- and CN^-.
- Options A and C are incomplete because they restrict ligands to only anions or only molecules respectively. Option B is incorrect because ligands are generally neutral molecules or anions; cations are not the general class of ligands.
- Therefore, Option D correctly describes ligands as either ions or molecules bonded by coordinate bonds to a central atom or ion.
Question 3
4 / -1

Unlike the other elements of its group carbon and silicon does not form MX₂ type molecules because

A
it is non-metallic

B
carbon undergoes catenation

C
energetically this is not possible

D
carbon does not contain d-orbita

Solution

The stability of dihalides (MX,) increases down the group. Except C and Si, the other members form dihalides.
Question 4
4 / -1

Glycinato ligand is:

A

B
bidentate ligant

C
two donor sites N and O^-

D
All of the above

Solution

These are facts about glycinato ligand.
Question 5
4 / -1

The element w hich is exclusivelyapplied as semi-conductor

A
Ge

B
Au

C
Pt

D
Si

Solution

Both Ge and Si are extensively used as semiconductors.

Semiconductors are solids where there is only a small difference in energy, called band gap, between the filled valency band of electrons and a conduction hand since the band gap of Ge is less than Si, it is a better element to be used as semiconductor.
Question 6
4 / -1

Ammonia gas can be collected by the downward displacement of which of the following?

A
mercury

B
water

C
brine

D
concentrated H₂SO₄

Solution

Ammonia gas can be collected by downward displacement of mercury (Hg). Ammonia gas is lighter than mercury and, hence, collected by the downward displacement of mercury.

Ammonia is not collected over water or brine (aqueous solution of sodium chloride) because it is highly soluble in water.

Also, being basic in nature, it will react with sulphuric acid. Thus, it can not be collected over sulphuric acid too.
Question 7
4 / -1

What is the substance bones contain which makes them glow in the dark?

A
red phosphorus that undergoes slow combustion in contact with air.

B
red phosphorus that changes into white form.

C
white phosphorus that undergoes slow combustion in contact with air.

D
white phosphorus that changes into red form.

Solution

Bones contain white phosphorous. It undergoes slow combustion in contact with air due to its low ignition temperature. This property of glowing in the dark and on the application of ultraviolet rays is called phosphorescence.
Question 8
4 / -1

Which of the following ligands is expected to be bidentate?

A
CH₃NH₂

B
H₃C ≡ N

C
Br

D
C₂O₄²⁻

Solution

When a ligand has two groups that are capable of bonding to the central atom, it is said to be bidentate. Thus, the only ligand, which is expected to be bidentate is C₂O₄²⁻ as
Question 9
4 / -1

The coordination number and oxidation state of Cr in K₃Cr(C₂O₄)₃ are respectively

A
3 and +3

B
3 and 0

C
6 and +3

D
4 and +2

Solution

As the number of atoms of the ligands that are directly bound to the central metal is known as coordination number. It is six here (see in figure).

Oxidation state :

Let oxidation state of Cr be x.

⇒ 3(+1) + x + 3(−2) = 0

⇒ 3 + x − 6=0

⇒ x = +3
Question 10
4 / -1

The number of geometrical isomers of the complex [Co(NO₂)₃(NH₃)₃] is

A
4

B
0

C
2

D
3

Solution

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Chemistry Test 216

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Chemistry Test 216

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Question 1

C

Ge

Pb

Si

Solution

Question 2

anions linked by coordinate bonds to a central metal atom or ion

cations linked by coordinate bonds to a central metal or ion

molecules linked by coordinate bonds to a central metal or ion

ions or molecules linked by coordinate bonds to a central atom or ion

Solution

Question 3

it is non-metallic

carbon undergoes catenation

energetically this is not possible

carbon does not contain d-orbita

Solution

Question 4

bidentate ligant

two donor sites N and O-

All of the above

Solution

Question 5

Ge

Au

Pt

Si

Solution

Question 6

mercury

water

brine

concentrated H2SO4

Solution

Question 7

red phosphorus that undergoes slow combustion in contact with air.

red phosphorus that changes into white form.

white phosphorus that undergoes slow combustion in contact with air.

white phosphorus that changes into red form.

Solution

Question 8

CH3NH2

H3C ≡ N

Br

C2O42−

Solution

Question 9

3 and +3

3 and 0

6 and +3

4 and +2

Solution

Question 10

4

0

2

3

Solution

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two donor sites N and O^-

concentrated H₂SO₄

CH₃NH₂

H₃C ≡ N

C₂O₄²⁻