Chemistry Test

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Chemistry Test - 10

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Weekly Quiz Competition

Question 1
4 / -1

Consider the following reaction.

\(\mathrm{BaCl}_{2}+\mathrm{MgSO}_{4} \rightarrow \mathrm{MgCl}_{2}+\mathrm{BaSO}_{4}\)

Which type of reaction is this?

A
Displacement reaction

B
Double displacement reaction

C
Addition reaction

D
Substitution reaction

Solution

A double displacement reaction is a reaction in which the ions in the reactants are exchanged to form a precipitate. In the given reaction, the cations exchange their molecule to form products. On mixing a solution of Barium chloride with Magnesium sulfate, a white precipitate of Barium sulfate is immediately formed. These reactions are ionic in nature. The reactants change into ions when dissolved in water and there is an exchange of ions in solution.
Question 2
4 / -1

What is the approximate number of molecules in 4.25 g of NH₃?

A
1 x 10²³

B
1.5 x 10²³

C
2 x 10²³

D
6 x 10²³

Solution

Number of moles of ammonia = 4.25/17 = 0.25 mol

Number of molecules in 0.25 mol of ammonia = 0.25 x 6.022 x 10²³

= 1.5 x 10²³
Question 3
4 / -1

Directions: In the following question, a statement of Assertion is given; followed by a corresponding statement of Reason just below it. Out of the statements mark the correct answer as:

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true, but the reason is not the correct explanation of the assertion.

(c) If assertion is true statement, but reason is false.

(d) If both assertion and reason are false.

Assertion: According to transition state theory, for the formation of an activated complex; one of the vibrational degree of freedom is converted into a translational degree of freedom.

Reason: Energy of the activated complex is higher than the energy of reactant molecules.

A
(a)

B
(b)

C
(c)

D
(d)

Solution

Transition state theory (TST) explains the reaction rates of elementary chemical reactions. The theory assumes a special type of chemical equilibrium (quasi-equilibrium) between reactants and activated transition state complexes. TST is used primarily to understand qualitatively how chemical reactions take place. In other words, one of the vibrational degrees of freedom is converted into translational degree of freedom.

An activated complex acts as an intermediary between the reactants and the products of the reaction. The energy of the activated complex is higher than that of reactants or the products, and the state is temporary. If there is not sufficient energy to sustain the chemical reaction, the activated complex can reform into the reactants in a backward reaction. With proper energy, though, the activated complex forms the products in a forward reaction.
Question 4
4 / -1

In case of a buffer solution containing equimolar amount of ammonium hydroxide and ammonium chloride, the reserve basicity of the solution is due to the presence of

A
ammonium hydroxide molecules

B
ammonium ions

C
ammonium chloride molecules

D
chloride ions

Solution

In case of a buffer solution containing equimolar amount of ammonium hydroxide and ammonium chloride, the reserve basicity of the solution is due to the presence of ammonium hydroxide molecules.
Question 5
4 / -1

In which of the following pairs are the two species not isostructural?

A
\(\mathrm{PCl}_{4}{ }^{+}\) and \(\mathrm{SiCl}_{4}\)

B
\(\mathrm{PF}_{5}\) and \(\mathrm{BrF}_{5}\)

C
\(\mathrm{AlF}_{6}{ }^{3-}\) and \(\mathrm{SF}_{6}\)

D
\(\mathrm{CO}_{3}{ }^{2-}\) and \(\mathrm{NO}_{3}\)

Solution

\(\mathrm{PF}_{5} \Rightarrow\) trigonal bipyramidal

\(\mathrm{B} \mathrm{r} \mathrm{F}_{5} \Rightarrow\) square pyramidal

\( \mathrm{PCl}_{4}^{+}\) and \(\mathrm{SiCl}_{4} \Rightarrow\) both tetrahedral

\(\mathrm{AlF}_{6}{ }^{3-}\) and \(\mathrm{SF}_{6}\) both are octahedral

\(\mathrm{CO}_{3}{ }^{2-}\) and \(\mathrm{NO}_{3}\) both are trigonal planar
Question 6
4 / -1

If the concentration of [Ag⁺] = 10^-5 in a solution, then the concentration of [Cl^-] required for the precipitation of AgCl (Ksp = 2 10^-12) is

A
10^-5

B
2 x 10^-7

C
10^-8

D
10^-9

Solution

Use the expression: K_sp = [Ag⁺][Cl^-] The solubility of silver chloride is 6.56 x 10^-⁴g/L. Calculate the solubility product constant for silver chloride. If the solubility product constant of a sparingly soluble salt is known, its solubility can be calculated.
Question 7
4 / -1

The total number of electrons in a molecule of CO₂ is

A
44

B
22

C
12

D
6

Solution

Total number of electrons in the molecule = Number of electrons of carbon atom + 2(number of electrons of oxygen atom)

= 6 + 2(8) = 22
Question 8
4 / -1

In which of the following ionisation processes has the bond order increased and the magnetic behaviour remains unchanged?

A
O₂ → O₂⁺

B
N₂ → N₂⁺

C
C₂ → C₂⁺

D
None of these

Solution

B.O. of O₂ = 1/2 [10 - 6] = 2; Paramagnetic

B.O. of O₂⁺= 1/2 [10 - 5] = 2.5; Paramagnetic
Question 9
4 / -1

If 18 g of glucose is added to 178.2 g of water, then the vapour pressure of water for this aqueous solution at 100^oC is

A
759.00 torr

B
7.60 torr

C
76.00 torr

D
752.40 torr

Solution

\(\frac{P^{0}-P_{1}}{P_{1}}=\frac{n}{N}\)
\(\frac{760-P_{1}}{P_{1}}=\frac{\frac{18}{180}}{\frac{178.2}{18}}=\frac{\frac{1}{10}}{9.9}=\frac{0.1}{9.9}\)
\(760-P_{n}=\frac{1}{99} P_{n}\)
\(760 \times 99-P_{1} \times 99=P_{1}\)
\(760 \times 99=100 P_{3}\)
\(P_{1}=\frac{760 \times 99}{100}=752.4\)
Question 10
4 / -1

When 10^-6 mole of a mono basic strong acid is dissolved in 1 litre of the solvent, its pH is

A
6

B
7

C
5

D
4

Solution

of HCl is 10^-8M. If you calculate for it , you'll see you get pH = 8 ! Which is basic pH! I have solved it for you, the answer is pH = 6.

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Chemistry Test - 10

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Chemistry Test - 10

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Question 1

Displacement reaction

Double displacement reaction

Addition reaction

Substitution reaction

Solution

Question 2

1 x 1023

1.5 x 1023

2 x 1023

6 x 1023

Solution

Question 3

(a)

(b)

(c)

(d)

Solution

Question 4

ammonium hydroxide molecules

ammonium ions

ammonium chloride molecules

chloride ions

Solution

Question 5

\(\mathrm{PCl}_{4}{ }^{+}\) and \(\mathrm{SiCl}_{4}\)

\(\mathrm{PF}_{5}\) and \(\mathrm{BrF}_{5}\)

\(\mathrm{AlF}_{6}{ }^{3-}\) and \(\mathrm{SF}_{6}\)

\(\mathrm{CO}_{3}{ }^{2-}\) and \(\mathrm{NO}_{3}\)

Solution

Question 6

10-5

2 x 10-7

10-8

10-9

Solution

Question 7

44

22

12

6

Solution

Question 8

O2 → O2+

N2 → N2+

C2 → C2+

None of these

Solution

Question 9

759.00 torr

7.60 torr

76.00 torr

752.40 torr

Solution

Question 10

6

7

5

4

Solution

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1 x 10²³

1.5 x 10²³

2 x 10²³

6 x 10²³

10^-5

2 x 10^-7

10^-8

10^-9

O₂ → O₂⁺

N₂ → N₂⁺

C₂ → C₂⁺