Chemistry | ECE Electronics and Communication Engineering | TANCET Anna University Online Objective Test

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Hydrogen Prepare / Learn

Q1. Temporary hardness It can be removed in boiling by precipitating

A. Ca(HCO3)2.Mg(OH)2

B. Mg(HCO3)2Ca(HCO3)2

C a C O_{3}

.Mg

(O H)^{2}

D. Mg(HCO3)2.CaCO3

Answer : Option C
Explaination / Solution:

C a C O_{3}

.Mg

(O H)^{2}

can be precipitate out in order to remove temporary hardness.

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Aldehydes Ketones and Carboxylic Acids Prepare / Learn

Q2. The appropriate reagent for the transformation:

N a B H_{4}

B. Zn (Hg), HCl

H_{2}

, Ni

N H_{2} N H_{2}, O H^{-}

Answer : Option D
Explaination / Solution:

For this reaction wolff Kishner reaction is used as –OH is acid sensitive group so clemmson cannot be used.

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Coordination Compounds Prepare / Learn

Q3. Which of the following complex ions/molecules of nickel is paramagnetic?

{[N i {(N H_{3})}_{4}]}^{2 +}

B. None of these

[N i {(C O)}_{4}]

N i (d i m e t h y l g l y o x i m e)_{2}

Answer : Option A
Explaination / Solution:

N i^{2 +}

is in 3d8 configuration so its para magnetic .

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Chemistry in Everyday Life Prepare / Learn

Q4. The purpose of adding bithional to medicated soaps is

A. To give a good smell

B. To make it look attractive

C. To impart antiseptic properties

D. To prevent soap from drying

Answer : Option C
Explaination / Solution:

bithional impart antiseptic properties.

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Electrochemistry Prepare / Learn

Q5. How much electricity in terms of Faraday is required to produce 20.0 g of Ca from molten CaCl2?

A. 1.3F

B. 1F

C. 1.2F

D. 0.8F

Answer : Option B
Explaination / Solution:

20g is 0.5 mol of

C a^{2} +

and for 1mol 2F charge is required.

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Chemical Bonding and Molecular Structure Prepare / Learn

Q6. The hybridization of orbitals of N atom in

{No}_{3}^{-}

{No}_{2}^{+}

and

N {H_{4}}^{+}

are respectively

A. sp, sp2, sp3

B. sp, sp3, sp2

sp2, sp, sp3

D. sp2, sp3, sp

Answer : Option C
Explaination / Solution:

Hybridization of orbitals of N atom in

{No}_{3}^{-}

{No}_{2}^{+}

and

N {H_{4}}^{+}

are

s p^{2}, sp, s p^{3}

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Haloalkanes and Haloarenes Prepare / Learn

Q7. The most common freons in industrial use is manufactured by

A. Fittig reaction

B. Wurtz reaction

C. Sandmeyer reaction

D. by Swarts reaction

Answer : Option D
Explaination / Solution:

Most common Freon is synthesized by Swartz reaction.

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry The s-Block Elements Prepare / Learn

Q8. Alkaline earth metals have large size of the atoms. Therefore, they shows

A. low nuclear charge

B. low hydration enthalpies

C. low ionization enthalpies

D. low electopositivity

Answer : Option C
Explaination / Solution:

The reason is that the atoms of alkali metals are of large sizes. therefore, the outermost electon is for away from the nucleus and canbe easily removed

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Organic Chemistry Some Basic Principles and Techniques Prepare / Learn

Q9. The elements present in an organic compound are converted from covalent form into the ionic form by fusing the compound with sodium metal. This test is called

A. Lassaigne’s test

B. Fehling’s test

C. Feulgen test

D. Iodoform test

Answer : Option A
Explaination / Solution:

to covert covalent form to ionic form sodium fusion test is done this is lassaignes test.

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Chemical Kinetics Prepare / Learn

Q10. Which among the following is an example of photochemistry used in our daily life?

A. In inversion of cane sugar

B. In photography

C. All of these

D. In decomposition of hydrogen peroxide

Answer : Option B
Explaination / Solution:

Photography is an example of photochemistry used in our daily life. Reaction takes place in the presence of light