Chemistry | Mechanical Engineering | TANCET Anna University Online Objective Test

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

Q1. When heated to high temperature, ferromagnetic substance changes to

A. paramagnetic

B. Ferrimagnetic

C. insulators

D. diamagnetic

Answer : Option A
Explaination / Solution:

Ferromagnetic substances changes to paramagnetic substance

TANCET Anna University Mechanical Engineering # Chemistry Polymers Prepare / Learn

Q2. Dacron is manufactured by heating a mixture of ethylene glycol and terephthalic acid with one of the Conditions given below.

A. None of these

B. at 420 to 460 K in the presence of zinc acetateantimony trioxide catalyst

C. by heating with water at a high temperature

D. condensation polymerisation under high pressure and at high temperature

Answer : Option B
Explaination / Solution:

Dacron is manufactured by heating a mixture of ethylene glycol and terephthalic acid at 420 to 460K in presence of

S n O_{3}

as catalyst.

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

Q3. Which one of the following molecules represents the increasing order of bond length ?

A. F2 < Cl2 < O2 < N2

B. Cl2 < O2 < N2 < F2

C. N2 < O2 < F2< Cl2

D. F2 < N2 < Cl2< O2

Answer : Option C
Explaination / Solution:

The bond lengths depend upon the number and type of bonds present in a molecule . Greater the number of bonds shorter would be the bond length.

Thus , the given molecules are all diatomic molecules where ,

(i) $N_{2}$ has the smallest bond length as it is triple bonded.

(ii) $O_{2}$ is double bonded so its bond length is greater than $N_{2}$ .

(iii) $F_{2} a n d C l_{2}$ both , though single bonded , the bond length of $C l_{2}$ is greater than that of $F_{2}$ due to its larger atomic size.

Hence , the correct increasing order of given molecules is $N_{2} < O_{2} < F_{2} < C l_{2}$

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

Q4.

Find energy of the photons which correspond to light of frequency $3 \times 10^{15}$ Hz (Hint: h = Planck’s constant = 6.626 × $10^{- 34}$ Js)

A. 0.988 ×

10^{- 18}

B. 2.988 ×

10^{- 18}

C. 1.308 ×

10^{- 18}

D. 1.988 ×

10^{- 18}

Answer : Option D
Explaination / Solution:

We know Planck's equation is

$E = h ν$

where E is energy, h is Planck’s constant, and $ν$ is frequency.

Put given values,

E = $6.626 \times 10^{- 34} \times 3 \times 10^{15}$ $= 1.988 \times 10^{- 18} J$

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

Q5. The greenhouse effect is thought to be the cause of:

A. An increase in asthma sufferers

B. An increase in global temperature

C. Skin cancer

D. Huge tomatoes

Answer : Option B
Explaination / Solution:

The greenhouse effect increases the global temperature

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

Q6. Which one of the following combines with

F e 2 +

ion to form a brown complex?

N 2 O 3

N 2 O 5

N 2 O

Answer : Option B
Explaination / Solution:

[F e (H 2 O) 5 N O] 2 +

is brown color complex.

TANCET Anna University Mechanical Engineering # Chemistry Hydrogen Prepare / Learn

Q7. The three isotopes of hydrogen in terms of chemical properties show one of the following properties

A. difference is in their rates of reactions

B. same rates of reactions because of the same electronic configuration

C. same rates of reactions because of the same mass

D. same rates of reactions because of the same enthalpy of bond dissociation

Answer : Option A
Explaination / Solution:

There are three isotopes of hydrogen namely, protium 1H1, deuterium 1H2 or D and lastly tritium 1H3 or T.Out of these three isotopes of hydrogen, only tritium is radioactive in nature which emits low energy b particles. As the electronic configuration of isotopes is same, they all have similar chemical properties. But they have a difference in their rates of reaction, this happens because of the different bond disassociation enthalpies.

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

Q8. Clemmensen reduction of a ketone is carried out in the presence of which of the following?

A. Glycol with KOH

H_{2}

and Pt as catalyst

C. Zn – Hg with HCl

L i A l H_{4}

Answer : Option C
Explaination / Solution:

For Clemmenson we use Zn-Hg( conc HCl )

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

Q9. The tetrahedral complex, bis(benzoylacetonato)beryllium(II) will show

A. Ligand isomerism

B. Structural isomerism

C. Optical isomerism

D. Geometrical isomerism

Answer : Option C
Explaination / Solution:

This complex is non superimposable mirror image.

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

Q10. Persons allergic to Penicillin can be given

A. Non – narcotic drugs

B. Narcotic drugs

C. Psychotherapeutic drugs

D. Sulpha drugs

Answer : Option D
Explaination / Solution:

Sulpha drugs is given to treat people who are allergic to pencillin.

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