Chemistry | Mechanical Engineering | TANCET Anna University Online Objective Test

TANCET Anna University Mechanical Engineering # Chemistry Polymers Prepare / Learn

Q1. Natural rubber is

A. polychloroprene

B. polyfluoroethylene

C. polyvinyl chloride

D. polyisoprene

Answer : Option D
Explaination / Solution:

Natural Rubber is polyisoprene.

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

Q2. Choose one of the following in the increasing order of electron gain enthalpy

A. Br < F < Cl < I

B. Cl < I < Br < F

C. I < Br < F < Cl

D. F < Cl < Br < I

Answer : Option C
Explaination / Solution:

In general as the we move down the group electron gain enthalpy decreases; so the expected trend should be I < Br < Cl < F but in actual the order is I < Br < F < Cl . This is due to small size of F atom. The valence electrons of F atom provide strong repulsion to incoming electron, hence F has unexpectedly low electron affinity.

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

Q3. Find energy of the photon which has wavelength of 0.50 Å. (Hint: h = Planck’s constant = 6.626 ×

10^{- 34}

A. 0.98 ×

10^{- 15}

B. 2.98 ×

10^{- 15}

C. 1.98 ×

10^{- 15}

D. 3.98 ×

10^{- 15}

Answer : Option D
Explaination / Solution:

Energy (E) of a photon having wavelength (λ) is given by the expression, $E = \frac{h c}{λ}$

where , h = Planck’s constant = $6.626 \times 10^{- 34} J s$

c = velocity of light in vacuum = $3 \times 10^{8} m / s$

Wavelength $λ = 0.50 A^{°} = 0.50 \times 10^{- 10} m$

Substituting the values in the given expression of E:

$\frac{6.626 \times 10^{- 34} \times 3 \times 10^{8}}{0.50 \times 10^{- 10}}$ $= 3.98 \times 10^{- 15} J$

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

Q4. Global warming will not result in:

A. Increasing sea levels

B. Unpredictable climate patterns

C. Increasing the size of the hole in the ozone layer

D. Melting of the ice caps

Answer : Option C
Explaination / Solution:

Global warming will not increase the size of the hole in the ozone layer as temperature does not affect the depletion.

TANCET Anna University Mechanical Engineering # Chemistry The d- and f- Block Elements Prepare / Learn

Q5. Lucas reagent is

H 2 S O 4 + H C l

N O + H 2 O

M n O 2 + H 2 O

Z n C l 2 + H C

Answer : Option D
Explaination / Solution:

Lucas Test is done to distinguish primary secondary and tertiary alcohols. Lucas reagent is

Z n C l 2 + H C l

TANCET Anna University Mechanical Engineering # Chemistry Hydrogen Prepare / Learn

Q6. Consider the reactions (A)

H_{2} O_{2} + 2HI \to I_{2} + 2 H_{2} O (B) HOCl + H_{2} O_{2} \to H_{3} O + Cl - - + O_{2}

A. a reducing agent in (A) and oxidising agent in (B)

B. an oxidising agent in (A) and reducing agent in (B)

C. a reducing agent in both (A) and (B)

D. an oxidising agent in both (A) and (B)

Answer : Option B
Explaination / Solution:

H_{2} O_{2}

is an oxidizing agent in 1st reaction and Reducing agent in 2nd reaction.

TANCET Anna University Mechanical Engineering # Chemistry Aldehydes Ketones and Carboxylic Acids Prepare / Learn

Q7. Which of the following statements is not correct?

A. Aldehydes and ketones undergo nucleophilic addition.

B. Lower members of aldehydes and ketones are soluble in water due to hydrogen bonding

C. Aldehydes and ketones undergo electrophilic substitution

D. Aldehydes and ketones contain polar carbonyl group

Answer : Option C
Explaination / Solution:

Aldehydes and ketones have polar C=O group therefore they undergo nucleophilic addition reactions.

TANCET Anna University Mechanical Engineering # Chemistry Coordination Compounds Prepare / Learn

Q8. Which of the following complexes can form d and l isomers?

[C o {(N H_{3})}_{2} C l_{3}]

C i s - - {[C o {(e n)}_{2} C l_{2}]}^{+}

[C o {(N H_{3})}_{2} C l_{3}]

{[C o {(N H_{3})}_{4} C l_{3}]}^{+}

T r a n s - - {[C o {(e n)}_{2} C l_{2}]}^{+}

Answer : Option B
Explaination / Solution:

C i s - - {[C o {(e n)}_{2} C l_{2}]}^{+}

exist as non superimposable mirror image.

TANCET Anna University Mechanical Engineering # Chemistry Chemistry in Everyday Life Prepare / Learn

Q9. In seasonal rhinitis and conjunctivitis, the drugs administered are

A. Hypnotics

B. Anti – microbials

C. Sulpha drugs

D. Anti – histamine

Answer : Option D
Explaination / Solution:

Anti-histamine is given to treat seasonal rhinitis and conjunctivitis.

TANCET Anna University Mechanical Engineering # Chemistry Thermodynamics Prepare / Learn

Q10. for the reaction at 298 K,

2A + B \to C

= 400 kJ

mo l^{- 1}

and

Δ S

= 0.2 kJ

K^{- 1} mo l^{- 1}

At what temperature will the reaction become spontaneous considering

Δ H

and

Δ S

to be constant over the temperature range.

A. 3500 K

B. 2000 K

C. 1500 K

D. 2500 K

Answer : Option B
Explaination / Solution:

ΔG= ΔH-TΔS At equilibrium ΔG=0 then T= ΔH/ΔS =2000K

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