Chemistry Test

Result

Chemistry Test - 16

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
3 / -1

Under Wolf-Kishner reduction conditions, the conversion which may be brought about is

A
benzaldehyde into benzyl alcohol

B
cyclohexanol into cyclohexanone

C
cyclohexanone into cyclohexanol

D
benzophenone into diphenylmethane

Solution
Question 2
3 / -1

When conc. H₂SO₄ is heated with P₂O₅, the acid is converted into

A
sulphur trioxide

B
sulphur dioxide

C
sulphur

D
a mixture of sulphur dioxide and sulphur trioxide

Solution

Sulphur trioxide (SO₃) is prepared by heating concentrated sulphuric acid (H₂SO₄), with a large excess of phosphorus pentoxide (P2O5).

H₂SO₄ + P₂O₅^_______SO₃ + 2HPO3
Question 3
3 / -1

Which of the following has the highest knocking?

A
Olefins

B
Branched chain olefins

C
Straight chain olefins

D
Aromatic hydrocarbons

Solution

Straight chain olefins have the highest knocking.
Question 4
3 / -1

Bond energies in NO, NO⁺ and NO^- follow which of the following orders?

A
NO^-> NO > NO⁺

B
NO > NO^- > NO⁺

C
NO⁺ > NO > NO^-

D
NO⁺ > NO^-> NO

Solution

As the positive charge decreases, the bond between nitrogen and oxygen becomes stronger. So, the correct order of the bond energies is NO⁺> NO > NO^-.
Question 5
3 / -1

Which of the following conformations of butane is most unstable?

A
Anti-eclipsed

B
Skew eclipsed

C
Fully eclipsed

D
Eclipsed

Solution

Fully eclipsed conformations of butane are most unstable as the groups attached to the two carbon atoms are closest to each other.
Question 6
3 / -1

Directions: In the following question, a statement of Assertion is given followed by a statement of Reason just below it. You have to read the statements carefully and choose the correct option accordingly.

Mark your answer as

(a) if both Assertion and Reason are true and Reason is the correct explanation for Assertion

(b) if both Assertion and Reason are true, but Reason is not the correct explanation for Assertion

(c) if Assertion is true, but Reason is false

(d) if both Assertion and Reason are false

Assertion: Rates of nitration of benzene and hexadeuterobenzene are different.

Reason: C - H bond is stronger than C - D bond.

A
(a)

B
(b)

C
(c)

D
(d)

Solution

Rates of nitration of benzene and hexadeuterobenzene are the same because the rate determining step,

does not involve the breaking of a carbon-hydrogen bond. Moreover, carbon-deuterium bond is broken more slowly than a carbon-hydrogen bond.
Question 7
3 / -1

Flint glass contains

A
borax

B
excess of sodium carbonate

C
hydrofluoric acid

D
lead oxide

Solution

Traditionally, flint glasses are lead glasses containing around 4-60% lead oxide.
Question 8
3 / -1

The number of possible isomers of an octahedral complex [Co(C₂O₄)₂(NH₃)₂]- is

A
1

B
2

C
3

D
4

Solution

In this case all three types of ligands L^a, L^band L^c may be trans, or one type may be trans while the other two are cis. This latter case gives two unique isomers (for a total of three)
Question 9
3 / -1

Dimethyl glyoxime gives a red precipitate with Ni²⁺, which is used for its detection. To get this precipitate readily, the best pH range is

A
< 1

B
2 - 3

C
3 - 4

D
9 - 11

Solution

An alkaline medium is essentially required for the detection of Ni²⁺ ions with the help of dimethyl glyoxime.

Hence, pH range must be 9 - 11.
Question 10
3 / -1

Which of the following compounds is a natural polymer?

A
Protein

B
Polythene

C
Polystyrene

D
PVC

Solution

A protein is a natural polymer, made up of amino acid monomers joined together by peptide bonds (peptide or amide linkages).

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Chemistry Test - 16

Result

Chemistry Test - 16

Score

-

Rank

-

SHARING IS CARING

Question 1

benzaldehyde into benzyl alcohol

cyclohexanol into cyclohexanone

cyclohexanone into cyclohexanol

benzophenone into diphenylmethane

Solution

Question 2

sulphur trioxide

sulphur dioxide

sulphur

a mixture of sulphur dioxide and sulphur trioxide

Solution

Question 3

Olefins

Branched chain olefins

Straight chain olefins

Aromatic hydrocarbons

Solution

Question 4

NO- > NO > NO+

NO > NO- > NO+

NO+ > NO > NO-

NO+ > NO- > NO

Solution

Question 5

Anti-eclipsed

Skew eclipsed

Fully eclipsed

Eclipsed

Solution

Question 6

(a)

(b)

(c)

(d)

Solution

Question 7

borax

excess of sodium carbonate

hydrofluoric acid

lead oxide

Solution

Question 8

1

2

3

4

Solution

Question 9

< 1

2 - 3

3 - 4

9 - 11

Solution

Question 10

Protein

Polythene

Polystyrene

PVC

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.

NO^-> NO > NO⁺

NO > NO^- > NO⁺

NO⁺ > NO > NO^-

NO⁺ > NO^-> NO