Chemistry Test

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Chemistry Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

Which is minimum basic-:

A
CH₂ = CH -- NH₂

B
CH₂ = NH

C
CH₃ -- C ≡ N

D
CH₃-- CH₂ -- NH₂

Solution

CH₃ -- C ≡ N

Hence correct answer is option C
Question 2
1 / -0

if the rate of reaction is equal to the rate constant, the order of the reaction is?

A
2

B
3

C
0

D
1

Solution

rate of reaction is equal to the rate constant for zero order reaction

Let us consider the following reaction-

A → B + C

Suppose this reaction is zero order then

Rate [A]^O

Thus rate = k [A]^O =k
Question 3
1 / -0

Absolute alcohol is prepared by-

A
Vacuum distillation

B
Azeotropic distillation

C
Steam distillation

D
None of these

Solution

Absolute alcohol is 100% ethanol which is prepared from rectified spirit. Absolute alcohol is prepared by Azeotropic distillation method. Rectified spirit is mixed with a suitable amount of benzene and subjected to fractional distillation.
Question 4
1 / -0

No. of water molecules in 1 drop of water, if 1 ml of water has 20 drops and A is Avogadro number,is-

A
0.05A

B
0.05A/18

C
0.5A

D
0.5A/18

Solution

0 drops of water makes 1ml = 1g

Hence 1 drop of water = 1/20 ml= 1/20 g

18 g (1 mole ) of water has A molecules

Thus 1/20 g of water = A/18 x1/20 = 0.05 A/18
Question 5
1 / -0

Which of the following is an ore of aluminium?

A
dolomite

B
azurite

C
bauxite

D
malachite

Solution

The chief ore of aluminium isbauxite.
Question 6
1 / -0

Vitamin B₁₂contains?

A
Co (III)

B
Ca (II)

C
Fe (II)

D
Zn (II)

Solution

Co (III)Vitamin B₁₂is the only, metal-containing vitamin– it is also a water-solublevitaminthat is stored in the liver and must come from the diet.Vitamin B₁₂is a collective term for a group ofcobalt-containingcompounds known as corrinoids which when assembled with 5th and 6th position ligands are known as cobalamins.
Question 7
1 / -0

Water has high boiling point because-

A
it is weak acid

B
it is associated with hydrogen bonding

C
it has higher molecular weight

D
it has more lattice energy

Solution

it is associated with hydrogen bonding

Hence correct answer is option B
Question 8
1 / -0

Correct Ksp value of alkaline earth sulphate-

A
BaSO₄>SrSO₄>CaSO₄

B
SrSO₄>CaSO₄>BaSO₄

C
BaSO₄>CaSO₄>SrSO₄

D
CaSO₄>SrSO₄>BaSO₄

Solution

CaSO₄>SrSO₄>BaSO₄

Hence correct answer is option D
Question 9
1 / -0

According to adsorption theory of catalysis-:

A
adsorption produces heat which increases the speed of the reaction

B
adsorption lowers the activation energy of the reaction

C
the concentration of reactant molecules at active centres of the catalyst becomes high due to adsorption

D
in the process of adsorption , the activation energy of the molecules becomes large

Solution

In the presence of catalyst the speed of reaction increases since the activation energy gets reduced and hence the rate of adsorption increases.
Question 10
1 / -0

The poisonous obtained on exposing chloroform to air and sunlight is-

A
CH₂O

B
${CH}_{3} Cl$

C
${CH}_{2} Cl - 2$

D
${COCl}_{2}$

Solution

when chloroform is exposed to sunlight and air , a poisonous gas called phosgene or carbonyl chloride (COCl₂) is obtained

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Chemistry Test - 29

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Chemistry Test - 29

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Question 1

CH2 = CH -- NH2

CH2 = NH

CH3 -- C ≡ N

CH3 -- CH2 -- NH2

Solution

Question 2

2

3

0

1

Solution

Question 3

Vacuum distillation

Azeotropic distillation

Steam distillation

None of these

Solution

Question 4

0.05A

0.05A/18

0.5A

0.5A/18

Solution

Question 5

dolomite

azurite

bauxite

malachite

Solution

Question 6

Co (III)

Ca (II)

Fe (II)

Zn (II)

Solution

Question 7

it is weak acid

it is associated with hydrogen bonding

it has higher molecular weight

it has more lattice energy

Solution

Question 8

BaSO4>SrSO4>CaSO4

SrSO4>CaSO4>BaSO4

BaSO4>CaSO4>SrSO4

CaSO4>SrSO4>BaSO4

Solution

Question 9

adsorption produces heat which increases the speed of the reaction

adsorption lowers the activation energy of the reaction

the concentration of reactant molecules at active centres of the catalyst becomes high due to adsorption

in the process of adsorption , the activation energy of the molecules becomes large

Solution

Question 10

CH2O

CH3Cl

CH2Cl-2

COCl2

Solution

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CH₂ = CH -- NH₂

CH₂ = NH

CH₃ -- C ≡ N

CH₃-- CH₂ -- NH₂

BaSO₄>SrSO₄>CaSO₄

SrSO₄>CaSO₄>BaSO₄

BaSO₄>CaSO₄>SrSO₄

CaSO₄>SrSO₄>BaSO₄

CH₂O

${CH}_{3} Cl$

${CH}_{2} Cl - 2$

${COCl}_{2}$