Chemistry Test 202

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Chemistry Test 202

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Weekly Quiz Competition

Question 1
4 / -1

Alcohols of low molecular weight are

A
Soluble in water

B
Soluble in water on heating

C
Insoluble in water

D
Insoluble in all solvents

Solution

Alcohols are soluble in water. This is due to the hydroxyl group in the alcohol which is able to form hydrogen bonds with water molecules. Alcohols with a smaller hydrocarbon chain are very soluble. As the length of the hydrocarbon chain increases, the solubility in water decreases.
Question 2
4 / -1

Benzyl alcohol is obtained from benzaldehyde by

A
Fittig's reaction

B
Cannizzaro's reaction

C
Kolbe's reaction

D
Wurtz's reaction

Solution
Question 3
4 / -1

The main structure features of proteins is

A
An ester linkage

B
An ether linkage

C
The peptide linkage

D
All

Solution

The chemical bond formed between amino acids, constituting the primary linkagein all protein structures. In a peptide bond, the carboxyl group (COOH) of one amino acid bonds with the amino group (NH2) of another, forming the sequence CONH and releasing water (H2O).
Question 4
4 / -1

Chemical equilibrium is dynamic in nature, because

A
the equilibrium is maintained rapidly

B
the concentration of reactants and products are constant but different

C
both forward and backward reactions occur at all times with same speed

D
the concentration of reactants and products becomes same at equilibrium

Solution

A chemical equilibrium is dynamic in nature which in other words means that reactions continue to occur in both forward as well as backward direction with the same speed. As a result, the amount of product formed immediately reacts backward to give reactants and so there is no change in concentration of reactant or product with the passage of time.
Question 5
4 / -1

The indicator that is obtained by coupling the diazonium salt of sulphanilic acid with N,N-dimethylaniline is

A
Phenanthroline

B
Methyl orange

C
Methyl red

D
Indigo

Solution
Question 6
4 / -1

The standard e.m.f. of a galvanic cell, with standard electrode potentials of zinc equal to -0.76 V and that of copper equal to + 0.34 V, is

A
+0.76

B
-1.1V

C
-0.34V

D
+1.1V

Solution

Ecell = E right - E left

= E•Cu²⁺/Cu - E•Zn²⁺/Zn

= (+0.34v) - (-0.76v)

=0.34+0.76

=1.1v
Question 7
4 / -1

Which of the following is not true for the order of a reaction?

A
Order of reaction is always a whole number

B
Order can only be determined experimentally

C
Order is not influenced by stoichiometric coefficient of the reactants

D
Order of reaction is sum of power of concentration terms of reactants to express the rate of reaction

Solution

Correct option is A)

If rate is given by: rate =k[A]x[B]y

then the order =x+y.

This order can be a positive, negative no., zero or even fractional. It can be determined only experimentally and does not depend on stoichiometric coefficients of reactants.
Question 8
4 / -1

When 10gram of methane is completely burnt in oxygen, the heat evolved is 560kJ. What is the heat of combustion (in kJ/mole) of methane?

A
− 1120

B
− 968

C
− 896

D
− 560

Solution

The chemical formula for methane is CH4 and its molecular mass is calculated as the sum of Mass of the carbon atom and Mass of hydrogen atoms. The molar mass of carbon is 12g/mol and the mass of hydrogen atom is 1g. Therefore, the Molar mass of methane is:

12+4×1=16g/mol

As we know, 10 gram of methane on combustion gives 560 KJ of heat. So 1 gram of methane on combustion gives = 560/10KJ of heat.

Hence, 16 gram of methane on combustion give=560/10×16=896KJ

Thus the heat of combustion of methane is -896KJ/mol. Therefore, the negative sign in the answer.
Question 9
4 / -1

Which of the following is most electronegative?

A
Carbon

B
Silicon

C
Lead

D
Tin

Solution

The electronegativity values for the representative elements decreses down a group because of the increase in atomic radius as well as screening effect. Thus, carbon has highest electronegativity in a group.
Question 10
4 / -1

The catalyst used for the polymerization of olefins is

A
Ziegler-Natta catalyst

B
Wilkinson's catalyst

C
Pd-catalyst

D
Zeolite

Solution

A Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, is a catalyst used in the synthesis of polymers of 1-alkenes (alpha-olefins).

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Re-Attempt Weekly Quiz Competition

Chemistry Test 202

Result

Chemistry Test 202

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SHARING IS CARING

Question 1

Soluble in water

Soluble in water on heating

Insoluble in water

Insoluble in all solvents

Solution

Question 2

Fittig's reaction

Cannizzaro's reaction

Kolbe's reaction

Wurtz's reaction

Solution

Question 3

An ester linkage

An ether linkage

The peptide linkage

All

Solution

Question 4

the equilibrium is maintained rapidly

the concentration of reactants and products are constant but different

both forward and backward reactions occur at all times with same speed

the concentration of reactants and products becomes same at equilibrium

Solution

Question 5

Phenanthroline

Methyl orange

Methyl red

Indigo

Solution

Question 6

+0.76

-1.1V

-0.34V

+1.1V

Solution

Question 7

Order of reaction is always a whole number

Order can only be determined experimentally

Order is not influenced by stoichiometric coefficient of the reactants

Order of reaction is sum of power of concentration terms of reactants to express the rate of reaction

Solution

Question 8

− 1120

− 968

− 896

− 560

Solution

Question 9

Carbon

Silicon

Lead

Tin

Solution

Question 10

Ziegler-Natta catalyst

Wilkinson's catalyst

Pd-catalyst

Zeolite

Solution

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