Chemistry | Mechanical Engineering | TANCET Anna University Online Objective Test

TANCET Anna University Mechanical Engineering # Chemistry States of Matter Prepare / Learn

Q1. Water has high surface tension and high capillarity because of

A. covalent bonds

B. dispersion forces

C. ionic bonds

D. Hydrogen bonds

Answer : Option D
Explaination / Solution:

Water molecules form extensive Hydrogen Bonds.

TANCET Anna University Mechanical Engineering # Chemistry Equilibrium Prepare / Learn

Q2.

For the reaction

H_{2} (g) + I_{2} (g)

⇌

2HI (g), the standard free energy is

Δ G^{-} > 0

The equilibrium constant (K ) would be __________.

A. K > 1

B. K < 1

C. K = 0

D. K = 1

Answer : Option B
Explaination / Solution:

ΔG=-RTlnK

TANCET Anna University Mechanical Engineering # Chemistry Biomolecules Prepare / Learn

Q3. zwitter ionic form of amino acids behave like

A. dipolar ion

B. anion

C. cation

D. non – polar molecule

Answer : Option A
Explaination / Solution:

Zwitter ion contain two polar group, amino and carboxalic acid group.

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

Q4. Lucas test is associated with

A. Carboxylic acid

B. Phenols

C. Aldehydes

D. Alcohols

Answer : Option D
Explaination / Solution:

Lucas Test is a test which is used to distinguish between primary, secondary and tertiary alcohols. This test is carried out with the help of Lucas reagent, which is a solution of anhydrous Zinc Chloride and concentrated hydrochloric acid (ZnCl₂ + HCl). It is based on the difference between the reactivity of primary, secondary and tertiary alcohols with hydrogen halides.

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

Q5. Which among the following is an example of a solid solution in which the solute is a gas?

A. Pumice stone

B. Hydrated salts

C. Aerated drinks

D. Humidity in air

Answer : Option A
Explaination / Solution:

Pumice stone is example of gas in Solid.

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

Q6. Secondary amines react with the nitrosonium ion to generate:

A. anilines

B. oximes

C. N – nitrosoamines

D. imines

Answer : Option C
Explaination / Solution:

2^{o}

amines react with

H N O_{2}

to form N-nitrosoamine.

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

Q7.

If an excess of $P_{4}$ is treated with $F_{2}$ , then_____will be produced wherein the oxidation number of P is +3. The compound is

A. PF5

B. PF6

C. PF

D. PF3

Answer : Option D
Explaination / Solution:

Whenever a reaction between an oxidising agent and a reducing agent is carried out, a compound of lower oxidation state is formed if the reducing agent is in excess and a compound of higher oxidation state is formed if the oxidising agent is in excess. This can be illustrated as follows:

P4 and F2 are reducing and oxidising agents respectively. If an excess of P4 is treated with F2, then PF3 will be produced, wherein the oxidation number (O.N.) of P is +3.
$P F_{4} (e x c e s s) + F_{2} \to P F_{3}$

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

Q8.

Consider the unbalanced chemical equation ,

----- Al + ------ $O_{2}$ → ------ $A l_{2} O_{3}$ .

The equation for above reaction can be balanced by inserting the following in blank spaces

A. 4,3,2

B. 4,2,3

C. 2,3,3

D. 2,3,1

Answer : Option A
Explaination / Solution:

The given equation gets balanced by inserting coefficients ( 4 , 3 , 2 ) in blank spaces from LHS to RHS ) . The balanced equation is -

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

Q9. Which gas is evolved when urea is treated with NaOH?

A. Ammonia

B. Nitrogen

C. Laughing gas

D. Nitrous oxide

Answer : Option A
Explaination / Solution:

Urea on reaction with NaOH liberates ammonia.

TANCET Anna University Mechanical Engineering # Chemistry Solid State Prepare / Learn

Q10. What type of interaction hold the molecules together in a polar molecular solid?

A. Dipole – dipole interaction

B. Metallic bonding

C. London forces

D. Hydrogen bonding

Answer : Option A
Explaination / Solution:

Polar molecule will act as a dipole.

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