Chemistry | Mechanical Engineering | TANCET Anna University Online Objective Test

TANCET Anna University Mechanical Engineering # Chemistry Biomolecules Prepare / Learn

Q1. Phospholipid is.

A. Act as material for proteins

B. An important source of energy

C. Have the same formulas as waxes

D. Ester of glycerol with phosphoric acid

Answer : Option D
Explaination / Solution:

Phospholipid is esters of glycerol with phosphoric acid.

TANCET Anna University Mechanical Engineering # Chemistry Alcohols Phenols and Ethers Prepare / Learn

Q2.

What is the correct order of reactivity of alcohols in the following reaction?

A. 1° > 2° > 3°

B. 3° > 2° > 1°

C. 3° > 1° > 2°

D. 1° < 2° > 3°

Answer : Option B
Explaination / Solution:

The mixture of HCl and ZnCl₂ is called the Lucas Reagent. Secondary and tertiary alcohols react via the S_N¹ mechanism with the Lucas reagent. The ZnCl₂coordinates to the hydroxyl oxygen, and this generates a far superior leaving group.

When alcohols react with a hydrogen halide, a substitution occurs, producing an alkyl halide and water:

Scope of Reaction: The order of reactivity of alcohols is 3° > 2° > 1°

TANCET Anna University Mechanical Engineering # Chemistry Equilibrium Prepare / Learn

Q3.

What will be the correct order of vapour pressure of water, acetone and ether At

3 0^{\circ} C

. Given that among these compounds, water has maximum boiling point and ether has minimum boiling point?

A. Water < ether < acetone

B. Acetone < ether < water

C. Water < acetone < ether

D. Ether < acetone < water

Answer : Option A
Explaination / Solution:

Water has maximum boiling point due to hydrogen bonding so its vapour pressure will be least because of low boiling point less amount of water will move to vapour phase at a particulat temperature so lesser will be the vapour pressure.

TANCET Anna University Mechanical Engineering # Chemistry Chemistry Solutions Prepare / Learn

Q4. The molarity of 900 g of water is

A. 50 M

B. 55.5 M

C. Cannot be calculated

D. 5 M

Answer : Option A
Explaination / Solution:

M=900/18 as density of water is 1g/ml.

TANCET Anna University Mechanical Engineering # Chemistry Redox Reactions Prepare / Learn

Q5.

Using the standard electrode potential of redox couples given below find out which of the following is the strongest oxidising agent.

E0 values: Fe3+/Fe2+ = +0.77; I2/I-(s) = +0.54; Cu2+/Cu = +0.34; Ag+/Ag = +0.80

A. Fe3+

B. Ag+

C. Cu2+

D. I2(s)

Answer : Option B
Explaination / Solution:

The more positive the value of E0, the greater is the tendency of the species to get reduced, therefore Ag+/Ag = +0.80 is strongest oxidising agent.

TANCET Anna University Mechanical Engineering # Chemistry Organic compounds containing Nitrogen Prepare / Learn

Q6. Arrange the following in order of increasing basicity: aniline, p – nitroaniline, p – toluidine,and p – methoxyaniline

A. aniline < p – methoxyaniline p – nitroaniline < p – toluidine

B. p – nitroaniline < aniline< p – methoxyaniline < p – toluidine

C. p – nitroaniline < aniline < p – toluidine < p – methoxyaniline

D. p – methoxyaniline p – nitroaniline < aniline < p – toluidine

Answer : Option C
Explaination / Solution:

-OMe group at para position will increase the basicity more than-CH3 group at para position. While presence of –NO2at para position will decrease the basicity.

TANCET Anna University Mechanical Engineering # Chemistry Some Basic Concepts of Chemistry Prepare / Learn

Q7.

Choose the most appropriate option to complete the statement -

" Whenever there is a rearrangement of atoms which makes or breaks chemical bonds ------------------------ "

A. catalysts are produced.

B. products appear,

C. reactants disappear

D. a chemical reaction takes place

Answer : Option D
Explaination / Solution:

The occurance of a chemical reaction is always associated with breaking & formation of bonds of the reactant and products along with rearrangement of their atoms , hence the statement at option 1 is most appropriate. ie. " Whenever there is a rearrangement of atoms which makes or breaks chemical bonds a chemical reaction takes place."

TANCET Anna University Mechanical Engineering # Chemistry Hydrocarbons Prepare / Learn

Q8. Ozonolysis of an organic compound 'A' produces an equimolar mixture of acetone and propionaldehyde . Identify the organic compound 'A' .

A. 2 - Methyl - 2 - pentene

B. 2 - Pentene

C. 2 - Methyl - 1 - pentene

D. 1 - Pentene

Answer : Option A
Explaination / Solution:

2- Methyl -2 - pentene when treated with ozone forms an unstable ozonide intermediate . The ozonide when treated with $(z i n c - d u s t + H_{2} O)$ yields an aldehyde (propionaldehyde ) and a ketone ( acetone ) as the final products The conversion reactions are represented as below.

Thus , the compound A is (2-Methyl -2 -pentene )

TANCET Anna University Mechanical Engineering # Chemistry General Principles and Processes of Isolation of Elements Prepare / Learn

Q9. Which among the following is not a basic flux?

S i O_{2}

C a C O_{3}

Answer : Option A
Explaination / Solution:

S i O_{2}

is acidic flux because Si is non metal.

TANCET Anna University Mechanical Engineering # Chemistry The p-Block Elements Prepare / Learn

Q10. Which is used to produce smoke screens?

A. Zinc sulphide

B. Calcium phosphide

C. Zinc phosphide

D. Sodium carbonate

Answer : Option B
Explaination / Solution:

Calcium phosphide is used to produce smoke screen.

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