Chemistry | Mechanical Engineering | TANCET Anna University Online Objective Test

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

Q1. Which colour is given by

C u S O_{4}

with ammonia?

A. White

B. Pink

C. Orange

D. Blue

Answer : Option A
Explaination / Solution:

TANCET Anna University Mechanical Engineering # Chemistry Hydrocarbons Prepare / Learn

Q2. Among the following compounds the one that is most reactive towards electrophilic nitration is

A. Toluene

B. Benzoic Acid

C. Nitrobenzene

D. Benzene

Answer : Option A
Explaination / Solution:

Methyl group is electron donating group, hence it increases the electron density in benzene ring thereby increasing the reactivity of the ring towards electrophilic substitution.

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

Q3. Which among the following act as flux , if iron oxide is present as an impurity?

H_{2} S O_{4}

S i O_{2}

S i O_{2}

S i O_{2}

Answer : Option D
Explaination / Solution:

Iron oxide is basic oxide so flux should be acidic.

TANCET Anna University Mechanical Engineering # Chemistry Thermodynamics Prepare / Learn

Q4. Calculate the enthalpy change on freezing of 1.0 mol of water at 10.0

^{\circ} C

to ice at -10.0

^{\circ} C

Δ_{fus}

H = 6.03 kJ

mo l^{- 1}

at 0

^{\circ} C

C_{p} [H2O (l)] = 75 . 3 J mo l^{- 1} K^{- 1}

C_{p} [H2O (s)] = 36 . 8 J mo l^{- 1} K^{- 1}

A. ΔH = −5.231 kJ mol−1

B. ΔH = −7.415 kJ mol−1

C. ΔH = −6.415 kJ mol−1

D. ΔH = −6.114 kJ mol−1

Answer : Option C
Explaination / Solution:

Δ H = Δ H_{1} + Δ H_{2} + Δ H_{3}

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

Q5. Which among the following is an example of non – polar molecule?

A. Methane

B. Diethyl ether

C. Water

D. Ethyl alcohol

Answer : Option A
Explaination / Solution:

Methane is a symmetrical.

TANCET Anna University Mechanical Engineering # Chemistry Classification of Elements and Periodicity in Properties Prepare / Learn

Q6. Right order of increasing metallic character is:

A. P < Si < Be < Mg < Na.

B. Si < Be < Mg < Na < P

C. Be < Mg < Na < P< Si

D. Si < Mg < Na < P < Be

Answer : Option A
Explaination / Solution:

Elements of s block are more matallic than p block elements

TANCET Anna University Mechanical Engineering # Chemistry Polymers Prepare / Learn

Q7. Which of the following polymer can be formed by using the monomer unit represented below?

A. Nylon 2–nylon 6

B. Melamine polymer

C. Nylon – 6, 6

D. Nylon 6

Answer : Option D
Explaination / Solution:

Nylon – 6, 6 Caprolactum is monomer of nylon 6.

TANCET Anna University Mechanical Engineering # Chemistry Structure of Atom Prepare / Learn

Q8.

The electronic configuration $1 s^{2} 2 s^{2} 2 p^{1}$ belongs to

A. Boron

B. Beryllium

C. lithium

D. carbon

Answer : Option A
Explaination / Solution:

Boron is a chemical element with symbol B and atomic number 5. So electronic configuration of boron is