Chemistry | Mechanical Engineering | TANCET Anna University Online Objective Test

TANCET Anna University Mechanical Engineering # Chemistry Equilibrium Prepare / Learn

Q1. Which of the following is not a general characteristic of equilibria involving physical processes?

A. All measurable properties of the system remain constant.

B. The opposing processes occur at the same rate and there is dynamic but stable condition

C. Equilibrium is possible only in a closed system at a given temperature.

D. All the physical processes stop at equilibrium.

Answer : Option D
Explaination / Solution:

All the physical processes stop at equilibrium.

TANCET Anna University Mechanical Engineering # Chemistry Biomolecules Prepare / Learn

Q2. Amylase is secreted by

A. Intestine

B. Pancreas

C. Saliva

D. Stomach

Answer : Option C
Explaination / Solution:

Amylase is given by salivary amylase enzyme in saliva.

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

Q3. An organic compound containing oxygen, upon oxidation forms a carboxylic acid as the only organic product with its molecular mass higher by 14 units. The organic compound is ______.

A. a primary alcohol

B. a ketone

C. an aldehyde

D. a secondary alcohol

Answer : Option A
Explaination / Solution:

When –CH₂OH group is replaced by –COOH group then only molecular wt will increase by 14units.

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

Q4. The type of intermolecular interaction present in n-Hexane and n-Octane is

A. Ion-dipole interaction

B. Dipole-dipole interaction

C. Vander wall forces of interaction

D. Hydrogen bonding

Answer : Option C
Explaination / Solution:

Both are Non Polar.

TANCET Anna University Mechanical Engineering # Chemistry Organic compounds containing Nitrogen Prepare / Learn

Q5. The nitrogen atom of trimethylamine is __________ hybridized which is reflected in the CNC bond angle of __________.

A. sp2, 108°

B. sp3, 108°

C. sp3, 120°

D. sp2, 120°

Answer : Option B
Explaination / Solution:

N (M e)_{3}

has Td geometry

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

Q6. Which of the following is not an example of redox reaction?

A. BaCl2+H2SO4→BaSO4+2HCl

B. 2K + F2 → 2KF

C. CuO +H2→ Cu +H2O

D. Fe2O3+3CO→2Fe+3CO2

Answer : Option A
Explaination / Solution:

The reaction is not redox because there is no oxidation or reduction of any element (i.e. no change in oxidation state/number).

Ba in BaCl2 is at a +2 charge because it is in group 2. On the other side of the equation Ba in BaSO4 is still +2. Cl2 on the first side of the equation is -2 (as 2 chlorines) and Cl is -2 on the other side as there are 2 of them.

H on both sides are both +1 (but technically +2 as there are two of them).

SO4 does not change oxidation number and always remains -2.

So, the reaction is not a redox reaction.

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

Q7.

------ $B a_{3} N_{2}$ +----- $H_{2} O$ → ------ Ba $(O H)_{2}$ + ------ $N H_{3}$ .

The above equation can be balanced by inserting the following in blank spaces from LHS to RHS respectively.

A. 1,3,6,2

B. 1,6,3,6

C. 2,6,1,2

D. 1,6,3,2

Answer : Option D
Explaination / Solution:

The given equation gets stoichiometrically balanced when the coefficients ( 1 , 6 , 3 , 2 ) starting from LHS to RHS are inserted in given blank spaces .

Thus , the balanced equation for the reaction is ,

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

Q8. Ozone reacts with KOH solution to form

K O_{3}

O_{2}

O_{3}

and

K O_{2}

O_{2}

and

K O_{2}

Answer : Option A
Explaination / Solution:

O_{3}

reacts with KOH to form

K O_{3}

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

Q9. An atom located at the body center of a cubic unit cell is shared by

A. no other unit cells

B. 2 adjacent unit cells

C. 8 adjacent unit cells

D. 4 adjacent unit cells

Answer : Option A
Explaination / Solution:

It is not been shared.

TANCET Anna University Mechanical Engineering # Chemistry Hydrocarbons Prepare / Learn

Q10.

Arrange the halogens $F_{2}, C l_{2}, B r_{2}, I_{2},$ in order of their increasing reactivity with alkanes.

A. Br2< Cl2< F2< I2

B. Br2< I2< Cl2< F2

C. I
2< Br2< Cl2< F2

D. F2< Cl2< Br2< I2

Answer : Option C
Explaination / Solution:

The reaction follows free radical mechanism in which the first step is generation of halogen free radical which is the fastest for fluorine.Hence the order.

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