Chemistry Test

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Chemistry Test - 11

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following alkaline earth metals will give grassy green colour in flame?

A
Calcium

B
Strontium

C
Barium

D
Radon

Solution

Barium gives grassy green colour in flame.
Question 2
4 / -1

Which of the following compounds burns to form an oxide, which is gaseous at room temperature?

A
Hydrogen

B
Phosphorus

C
Calcium

D
Sulphur

Solution

Sulphur burns with a blue flame concomitant with formation of sulphur dioxide, which is gaseous at room temperature.
Question 3
4 / -1

Assign the hybridization, shape and magnetic moment of K₂[Cu (CN)₄].

A
sp³, tetrahedral, 1.73 BM

B
dsp², square planar, 1.73 BM

C
sp³, tetrahedral, 2.44 BM

D
dsp², square planar, 2.44 BM

Solution

In this complex copper is in +2 oxidation state. Cu²⁺ has electronic configuration is [Ar] 3d⁹ 4s⁰. So in this compound copper undergo dsp² hybridization to give square planar structure. Since Cu²⁺ has only one unpaired electron so using, √[n(n+2)] the dipole moment comes out to be 1.73 BM.
Question 4
4 / -1

Every polymer can be classified into different modes of polymerization. Identify the mode of polymerization of nylon-6,6.

A
Condensation polymerization

B
Addition polymerization

C
Substitution polymerization

D
None of the above

Solution

The condensation polymers are formed by repeated condensation reactions between two different bi-functional or tri-functional monomeric units. In these polymerization reactions, the elimination of small molecules such as water, alcohol, hydrogen chloride, etc. takes place.
Question 5
4 / -1

Colloidal medicines are more effective because

A
they are clean

B
they are easy to prepare

C
the germs move towards them

D
they are easily assimilated and adsorbed

Solution

Medicines are more effective in colloidal state because colloids have a larger surface area. Thus, they get easily assimilated, absorbed and digested.
Question 6
4 / -1

In silicon dioxide,

A
there are double bonds between silicon and oxygen atoms

B
silicon atom is bonded to two oxygen atoms

C
each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms

D
each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms

Solution

It contains many silicon and oxygen atoms. All the atoms in its structure are linked to each other by strong covalent bonds. The atoms are joined to each other in a regular arrangement, forming a giant covalent structure.
Question 7
4 / -1

Vanadium (III) oxide is a strong _________.

A
drying agent

B
oxidizing agent

C
reducing agent

D
wetting agent

Solution

Vanadium (III) oxide acts as a strong reducing agent in many type of reactions due to strong reducing nature of V³⁺ ions.
Question 8
4 / -1

Liquids which decompose below their normal boiling point can be distilled at a lower temperature by

A
increasing the pressure

B
decreasing the pressure

C
heating in water bath

D
heating in sand bath

Solution

Liquids which decompose below their normal boiling point can be distilled at a lower temperature by decreasing the pressure.
Question 9
4 / -1

What amount (in g) of bromine will be required to convert 2 g of phenol into 2, 4, 6-tribromophenol?

A
4.00

B
6.00

C
10.22

D
20.44

Solution

1 mole of phenol (mol. mass = 94) requires 3 moles of Br₂ (mol. mass = 160)
Write equation for chemical change,
find molecular masses of reactants and products and solve it.

Molecular weight of phenol \(=12 \times 6+1 \times 6+16=94\)
Molecular wt. of \(\mathrm{Br}_{2}=3 \times 160=480\) \(\because 94 \mathrm{g}\) of phenol requires \(=480 \mathrm{g}\) of \(\mathrm{Br}_{2}\)
\(\therefore 2 \mathrm{g}\) of phenol requires \(=\frac{480}{94} \times 2=10.22 \mathrm{g}\)
Question 10
4 / -1

Which of the following indicates open chain structure of glucose?

A
Penta-acetyl derivative of glucose

B
Cyanohydrin formation with HCN

C
Reaction with Fehling solution

D
Reaction with Tollen's reagent

Solution

Pentacetyl formation of glucose indicates that the latter contain 5–OH groups, indicating the open chain structure of glucose.

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Chemistry Test - 11

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Chemistry Test - 11

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Question 1

Calcium

Strontium

Barium

Radon

Solution

Question 2

Hydrogen

Phosphorus

Calcium

Sulphur

Solution

Question 3

sp3, tetrahedral, 1.73 BM

dsp2, square planar, 1.73 BM

sp3, tetrahedral, 2.44 BM

dsp2, square planar, 2.44 BM

Solution

Question 4

Condensation polymerization

Addition polymerization

Substitution polymerization

None of the above

Solution

Question 5

they are clean

they are easy to prepare

the germs move towards them

they are easily assimilated and adsorbed

Solution

Question 6

there are double bonds between silicon and oxygen atoms

silicon atom is bonded to two oxygen atoms

each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms

each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms

Solution

Question 7

drying agent

oxidizing agent

reducing agent

wetting agent

Solution

Question 8

increasing the pressure

decreasing the pressure

heating in water bath

heating in sand bath

Solution

Question 9

4.00

6.00

10.22

20.44

Solution

Question 10

Penta-acetyl derivative of glucose

Cyanohydrin formation with HCN

Reaction with Fehling solution

Reaction with Tollen's reagent

Solution

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sp³, tetrahedral, 1.73 BM

dsp², square planar, 1.73 BM

sp³, tetrahedral, 2.44 BM

dsp², square planar, 2.44 BM