NEET CHEMISTRY question bank, MCQ CBSE Notes, Lectures

1 Surface Chemistry

When oil and water are into the same vessel, two layers are observed with the less dense oil on top. These two liquids are said to be:

1) hydrophilic
2) immiscible
3) hydrophobic
4) insoluble

Option 1

Option 2 Solution:

Solution

When oil and water are into the same vessel, two layers are observed with the less dense oil on top. These two liquids are said to be immiscible. Liquids tend to be immiscible when the force of attraction between the molecules of the same liquid is greater than the force of attraction between the two different liquids.

Oils are typically nonpolar carbon-based molecules with high molecular weights. As a result, there are strong dispersion forces between the molecules in an oil.

Water molecules interact strongly by hydrogen bonding, so (if we consider water to be the solvent and oil the solute), we would say that there are strong solvent-solvent interactions (H bonding) and strong solute-solute interactions (dispersion forces between rather large molecules) but the solvent-solute interaction (dispersion interaction between water and 'oil') is sufficiently weak.

Option 3

Option 4

2 Solutions

A certain sample of cuprous sulphide is found to have composition Cu_1.8S, because of incorporation of Cu²⁺ ions in the lattice. What is the mole %of Cu²⁺ in total copper content in this crystal?

1) 99.8%
2) 11.11%
3) 88.88%
4) None

Option 1

Option 2 Solution:

Solution

Let us consider the problem:

Two Cu⁺ replaced 1 Cu²⁺ in Cu₂S sample.

Total loss of Cu=0.2mole

Since of Cu²⁺ in total copper content =0.21.8×100=11.11%

Option 3

Option 4

3 Solutions

The van't hoff factor for 0.1 molal Ba(NO₃)₂ solution is 2.74. Its degree of dissociation is

1) 0.74
2) 0.91
3) 0.87
4) 1.0

Option 1

Option 2

Option 3 Solution:

Solution

$$α =\frac{i−1}{(x+y)−1}$$

Option 4

4 Electrochemistry

Passage of three faradays of charge through an aqueous solution of AgNO₃, CuSO₄, Al(NO₃)₃and NaClwill deposit metals at the cathode in the molar ratio of:

1) 1:2:3:1
2) 6:3:2:6
3) 6:3:0:0
4) 3:2:1:0

Option 1

Option 2 Solution:

SOLUTION

AgNO₃+ e−?Ag+NO₃⁻

1 mole of AgNO₃ required 1 mole of e⁻ or 1 Faraday of electricity.

Thus 3F is used for 3 mole of AgNO₃

CuSO₄ + 2e− ? Cu+SO₄²⁻

1 mole of CuSO₄ required 2 Faraday of charge.

Thus 33 Faraday of charge will deposit / 32 mole of CuSO₄

Al(MO₃)₃+ 3e− + 3e⁻ ? Al + 3NO⁻ 3Al+3NO₃⁻

3F of charge is required for 1 mole of Al(NO₃)₃

NaCl + e− ? Na + Cl⁻

1F of charge required for 1 mole of NaCl .

Thus, 3F of charge is required for 3 mole of NaCl

The molar ratio will be: 6:3:2:6

Option 3

Option 4

5 Classification of Elements and Periodicity

The correct order of decreasing ionic radius among the following anions would be:

1) Se²⁻,I⁻,Br⁻,F⁻,O²⁻
2) F⁻.Br⁻,O²⁻,Se²⁻,I⁻
3) I⁻,Se²⁻,Br−,O²⁻,F⁻
4) F⁻,O²⁻,Br−,Se²⁻,I⁻

Option 1

Option 2

Option 3 Solution:

SOLUTION

The correct order of decreasing ionic radius among the following anions would be I⁻,Se²⁻,Br−,O²⁻,F⁻

On moving down the group, the ionic radii increases as new shells of electrons are added. The radius of the isoelectronic species decreases with increasing charge.

Option 4

6 Environmental Chemistry

Which of them form complex bond with H2S in the enzymes in blood?

1) Iron

2) Cobalt

3) Haemoglobin

4) None of above

Option 1

Option 2

Option 3 Solution:

Solution

H2S combines with hemeproteins such as cytochrome c oxide (CCO), Myoglobin(Mb), and Haemoglobin (Hb) decreasing cellular ATP and activates K ATP channels.

Option 4

7 Environmental Chemistry

Eutrophication causes reduction in:
A) Nutrients
B) Dissolved salts
C) Dissolved oxygen

1) A

2) B & C

3) C

4) A, B & C

Option 1

Option 2

Option 3 Solution:

Solution

Eutrophication is the process of enriching water bodies with phosphates like nutrients. It supports the abnormal growth of algae & the lakes and ponds become marshy.
As the algae increases, it consumes more DO and therefore the levels of DO decreases.

Option 4

8 P � Block Elements

The most efficient agent for the absorption of SO₃ is:

1) 80% H₂S0₄.
2) 98% H₂S0₄.
3) 90% H₂S0₄.
4) 20% H₂S0₄

Option 1

Option 2 Solution:

Option 3

Option 4

9 Haloalkanes and Haloarenes

What is the final product obtained when chlorine reacts with ethyl alcohol in KOH?

1) CHCl₃

2) CCl₃CHO

3) CH₃Cl

4) None

Option 1

Option 2

Option 3 Solution:

SOLUTION

When chlorine reacts with ethyl alcohol in the presence of KOH, chloroform is obtained as a final product.

Cl₂+CH₃CH₂OH?CH₃CHO+2HCl [oxidation]

CCl₃CHO+KOH --^Hydrolysis?CHCl₃+ HCOOK

Option 4

10 P � Block Elements

p-type silicon is formed by adding a minute amount of an element with :

1) three valence electrons
2) five valence electrons
3) four valence electrons
4) six valence electrons

Option 1 Solution:

Option 2

Option 3

Option 4

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