Chemistry | Mechanical Engineering | TANCET Anna University Online Objective Test

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

Q1. Conversion of ore to oxide is generally carried out by the process of

A. Calcinations

B. Both (a) and (b)

C. Smelting

D. Roasting

Answer : Option B
Explaination / Solution:

Calcination is employed for carbonate ores to convert into respective oxide ores. Roasting is employed for sulphide ores for convertion to oxide ores.

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

Q2. Before the 4p orbital is filled, filling up of 3d orbitals becomes energetically favourable and there are 3d transition series of elements. This starts from scandium (Z = 21) which has the outermost electronic configuration of.

A. 2d13s2

C. 3d14s2

Answer : Option C
Explaination / Solution:

The electronic configuration of scandium is [Ar] 3d1 4s2.

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

Q3. According to the Heisenberg uncertainty principle, in dealing with milligram-sized or heavier objects,

A. the associated uncertainties are very important

B. the associated uncertainties are unacceptable

C. the associated uncertainties are hardly of any real consequence

D. there are no uncertainties at all

Answer : Option C
Explaination / Solution:

The effect of Heisenberg uncertainty principle is significant only for motion of microscopic objects, it is negligible in case of macroscopic objects. For example, we apply the concept of uncertainty to an object of mass 1 milligram.

$Δ x \times ∆ v_{x} = \frac{h}{4 π m}$

$= \frac{6.626 \times 10^{- 34}}{4 \times 3.1416 \times 10^{- 6}} \approx 10^{- 28} m^{2} s^{- 1}$

The value of $∆ x ∆ v_{x}$ is very small and insignificant in this case. Therefore, when we deal with heavier objects the associated uncertainties have no real consequences and can be neglected.

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

Q4. Avogadro's constant is the number of entities ( viz. atoms , molecules or ions ) present in ------------- mole of a substance.

A. 0.01

B. 1.0

C. 0.50

D. . 0. 25

Answer : Option B
Explaination / Solution:

Avagadro's constant represents the number of entities ( viz, atoms , molecules or ions ) present in 1 mole of a substance .

The constant ( denoted by N )

=6.022 x 1023

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

Q5. In cold places, vegetables, fruits and flowers are grown in glass covered areas called green houses. This is because of one or more of the following. Choose the most appropriate :

A. It traps the solar energy

B. It absorbs the infrared radiation

C. It maintains the temperature

D. It maintains the temperature as well as traps the solar energy

Answer : Option D
Explaination / Solution:

In cold places, vegetables, fruits and flowers are grown in glass covered areas as they maintains the temperature as well as traps the solar energy. Glass is opaque to IR (heat) radiation and it partly absorbs and partly reflects the heat which maintains the temperature and traps the solar energy.

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

Q6. Which one of the following compound is deliquescent?

Z n C l_{2}

H g_{2} C l_{2}

C d C l_{2}

H g C l_{2}

Answer : Option A
Explaination / Solution:

Z n C l_{2}

is deliquescent.

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

Q7. Arrange the following sets of compounds in order of their increasing boiling points : Pentan – 1 – ol, butan – 1 – ol, butan – 2 – ol, ethanol, propan – 1 – ol, methanol

A. Pentan – 1 – ol Methanol, ethanol, propan – 1 – ol, butan – 2 – ol, butan – 1 – ol,

B. Methanol, ethanol, propan – 1 – ol, butan – 2 – ol, butan – 1 – ol, pentan – 1 – ol.

C. Butan – 2 – ol, butan – 1 – ol, pentan – 1 – ol, methanol, ethanol, propan – 1 – ol,

D. Propan – 1 – ol, butan – 2 – ol, butan – 1 – ol, pentan – 1 – ol, methanol, ethanol

Answer : Option B
Explaination / Solution:

Boiling point is α Vanderwall forces α Molecular weight.

TANCET Anna University Mechanical Engineering # Chemistry Hydrogen Prepare / Learn

Q8.

Diborane $(B_{2} H_{6})$ is one of the following

A. electron acceptor

B. Lewis bases

C. Electron-precise compound

D. electron donor

Answer : Option A
Explaination / Solution:

Diborane is said to be electron deficient because boron require 5 electrons to complete its octet. But in this molecule, each boron atom is bonded to 2 terminal hydrogen atoms each. Also, the two boron atoms are held together by two hydrogen atoms as shown below:

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

Q9. The drug which can act both as an analgesic and antipyretic is

A. Aspirin

B. Equanil

C. Valium

D. Zantac

Answer : Option A
Explaination / Solution:

Asprin can act as both analgesic and antipyretic

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

Q10. The effective atomic number of Fe in

F e {(C O)}_{5}

A. 36

B. 26

C. 34

D. 24

Answer : Option A
Explaination / Solution:

26+2(5)=36

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