Chemistry | Mechanical Engineering | TANCET Anna University Online Objective Test

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

Q1. Anisole is called

A. Methoxybenzene

B. Butanyl phenyl ether

C. Methoxyphenol

D. Vinegar

Answer : Option A
Explaination / Solution:

Anisole, or methoxybenzene, is an organic compound with the formula

C H_{3} O C_{6} H_{5}

. It is a colorless liquid with a smell reminiscent of anise seed, and in fact many of its derivatives are found in natural and artificial fragrances.

C H_{3} O C_{6} H_{5}

C H_{3} O C_{6} H_{5}

TANCET Anna University Mechanical Engineering # Chemistry Hydrocarbons Prepare / Learn

Q2.

The number of chain isomers of $C_{5} H_{12}$ are

A. 3

B. 2

C. 5

D. 4

Answer : Option A
Explaination / Solution:

n-pentane CH3CH2CH2CH2CH3

2-Methylbutane CH3CH(CH3)CH2CH3

2,2-Dimethylpropane CH3CH(CH3)2CH3

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

Q3. For ideal solution the volume of mixing of the pure components to form the solution is

A. none of these

B. △Vmix= 0

C. △Vmix=+ve

D. △Vmix=−ve

Answer : Option B
Explaination / Solution:

For ideal solution there is no increase or decrease in volume on mixing.

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

Q4. Copper nitrate is a blue coloured solution. Place a strip of metallic zinc in an aqueous solution of copper nitrate for about one hour. What happens?

A. The aqueous solution of copper nitrate turns green in colour and mettallic zinc strip turns darker in colour.

B. zinc strip becomes coated with blue colour

C. the blue colour of the solution turns to red

D. the blue colour of the solution becomes more intense blue.

Answer : Option A
Explaination / Solution:

On placing a strip of mettallic zinc in an aqueous solution of copper nitrate for about one hour, the copper nitrate solution turns green in colour and zinc strip turns darker.

Formula and Ionic equation for the reaction is as follows.

Formula Equation:	Zn (s) + Cu(NO3)2 (aq) → Cu (s) + Zn(NO3)2 (aq)
Ionic Equation:	Zn (s) + Cu2+ (aq) → Zn2+ (aq) + Cu (s)

As is seen in ionic equation Zn is loosing 2 electrons, thus oxidation occurs and Cu is gaining 2 electrons, thus reduction occurs. Since oxidation and reduction takes place simultaneously in this reaction, it is a redox reaction. Also since Zn is loosing electrons and becoming darker in colour, it is the reducing agent and Cu is gaining 2 electrons, it is the reducing agent. The resultant solution Zinc nitrate [Zn(NO3)2] is green in colour.

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

Q5. How many tetrahedral voids can exist per unit cell in hexagonal close packing sphere?

A. 24

B. 8

C. 18

D. 12

Answer : Option D
Explaination / Solution:

For hcp packing Z(no. of atoms per unit cell is 6) and no. of Td voids are 2Z.

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

Q6. Modern Periodic Law can be stated as:

A. The physical and chemical properties of the elements are independent of their atomic numbers.

B. The physical and chemical properties of the elements are periodic functions of their neutron numbers.

C. The physical and chemical properties of the elements are periodic functions of their atomic masses.

D. The physical and chemical properties of the elements are periodic functions of their atomic numbers.

Answer : Option D
Explaination / Solution:

Modern Periodic Law can be stated that the physical and chemical properties of the elements are periodic functions of their atomic numbers

TANCET Anna University Mechanical Engineering # Chemistry Polymers Prepare / Learn

Q7. Melamine is

A. Semi – synthetic polymer

B. cross linked polymer

C. Linear polymer

D. Branched chain polymers

Answer : Option B
Explaination / Solution:

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

Q8. Which among the following forms basic oxide?

A. Phosphorous

B. Antimony

C. Nitrogen

D. Bismuth

Answer : Option D
Explaination / Solution:

As we move down the group in periodic table , metallic character increases so Bi is a metal thus its oxide is basic.

TANCET Anna University Mechanical Engineering # Chemistry Thermodynamics Prepare / Learn

Q9. If

V_{f}

is the final volume and

V_{i}

is the initial volume and

p_{ex}

the external pressure the work done can be calculated by

A. −∫Vi0pexdV

∫0VfpexdV

- \int_{V_{i}}^{V_{f}} p_{e x} d V

∫ViVfpexdV

Answer : Option C
Explaination / Solution:

−∫ViVfpexdV

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

Q10. The common impurity present in most of the ores is

S i O_{2}

S n O_{2}

Answer : Option A
Explaination / Solution:

Silica is most common impurity present in ores.

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