Chemistry Test

Result

Chemistry Test - 28

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
1 / -0

Which of the following is the electron deficient molecule?

A
$C_{2} H_{6}$

B
${SiH}_{4}$

C
$B_{2} H_{6}$

D
${PH}_{3}$

Solution

B₂H₆ is electron deficient molecule because boron atom has 3 half filled orbitals in excited state. In it 2 electrons of a B—H bond are involved in formation of 3 centre bond.
Question 2
1 / -0

Wood spirit is knowm as-:

A
methanol

B
ethanol

C
acetone

D
benzene

Solution

Methanol, also known as methyl alcohol among others, is a chemical with the formula CH3OH (a methyl group linked to a hydroxyl group, often abbreviated MeOH). Methanol acquired the name wood alcohol because it was once produced chiefly by the destructive distillation of wood.
Question 3
1 / -0

In lab H₂O₂ is prepaired by-:

A
HCl + BaO₂

B
H¬2 + O₂

C
cold H₂SO₄ + BaO₂

D
conc.H₂SO₄+ Na₂O₂

Solution

Ans- $cold H_{2} {SO}_{4} + {BaO}_{2}$

From barium peroxide-Laboratorymethod ofpreparation.Hydrogen peroxide is preparedfrom barium peroxide by the following methods: (a) By the action of dilute sulphuric acid. Apaste of hydrated barium peroxide (BaO₂. 8H₂O) isprepared inice – cold waterandthen added slowly to an ice-cold solution of 20% H₂SO₄.
Question 4
1 / -0

Amongst the following which one is not chiral?

A
2-Butanol

B
3-Bromopentane

C
2-Hydroxypropanoic acid

D
2,3-Dibromobutane

Solution

3-Bromopentane is not chiral.

Hence correct answer is option B
Question 5
1 / -0

Due to Frenkel defect,the density of ionic salts-

A
increases

B
decreases

C
does not change

D
None of these

Solution

In Frenkel defect the density of ionic solids doesn't change and remains same.
Question 6
1 / -0

Iodoform test is not given by?

A
2- pentanone

B
ethanol

C
3- pentanone

D
none of these

Solution

Ans 3- pentanone

Iodoform test is notanswered by methanol CH3OH. Note: Compounds containing methyl keto (−CH3CO) group, or the compounds that can be easily oxidized to methyl ketones, give positiveiodoform test.
Question 7
1 / -0

Which type of crystals contain more than one Bravais lattice?

A
triclinic

B
monoclinic

C
hexagonal

D
rhombohedral

Solution

Monoclinic crystals have 2 Bravais lattices-simple and body central.
Question 8
1 / -0

The shape of O₂F₂ is similar to that of-:

A
$C_{2} F_{2}$

B
$H_{2} O_{2}$

C
$H_{2} F_{2}$

D
$C_{2} H_{2}$

Solution
Question 9
1 / -0

The correct order of reactivity towards the electrophilic substitution of the compounds aniline(I),benzene(II) and nitrobenzene(III) is-

A
II < III > I

B
I > II > III

C
III > II > I

D
II > III > I

Solution

In aniline –NH₂ group is attached with benzene ring. –NH₂ group shows +M effect.So it activates the benzene ring.Hence rate of electrophilic substitution is increased due to increase in the electron density at o/p position.

In case of nitrobenzene ,-NO₂ deactivates the benzene ring , so in nitrobenzene rate of electrophilic substitution is lower than benzene.Hence order of SE reaction is-

I > II > III .
Question 10
1 / -0

Phenelzine and Iproniazid are-:

A
antidepressants

B
Tranquilizer

C
both (a) and (b)

D
antibiotic

Solution

both (a) and (b)

Hence correct answer is option C

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Chemistry Test - 28

Result

Chemistry Test - 28

Score

-

Rank

-

SHARING IS CARING

Question 1

C2H6

SiH4

B2H6

PH3

Solution

Question 2

methanol

ethanol

acetone

benzene

Solution

Question 3

HCl + BaO2

H¬2 + O2

cold H2SO4 + BaO2

conc.H2SO4 + Na2O2

Solution

Question 4

2-Butanol

3-Bromopentane

2-Hydroxypropanoic acid

2,3-Dibromobutane

Solution

Question 5

increases

decreases

does not change

None of these

Solution

Question 6

2- pentanone

ethanol

3- pentanone

none of these

Solution

Question 7

triclinic

monoclinic

hexagonal

rhombohedral

Solution

Question 8

C2F2

H2O2

H2F2

C2H2

Solution

Question 9

II < III > I

I > II > III

III > II > I

II > III > I

Solution

Question 10

antidepressants

Tranquilizer

both (a) and (b)

antibiotic

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.

$C_{2} H_{6}$

${SiH}_{4}$

$B_{2} H_{6}$

${PH}_{3}$

HCl + BaO₂

H¬2 + O₂

cold H₂SO₄ + BaO₂

conc.H₂SO₄+ Na₂O₂

$C_{2} F_{2}$

$H_{2} O_{2}$

$H_{2} F_{2}$

$C_{2} H_{2}$