Chemistry Test - 32

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Chemistry Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following expressions is not true?

A

For a netural solution \(\left[H^{+}\right]=\left[O H^{-}\right]=\sqrt{K_{w}}\)

B

For an acidic solution \(\left[H^{+}\right]>\sqrt{K_{w}}\) and \(\left[O H^{-}\right]<\sqrt{K_{w}}\)

C

For an alkaline solution \(\left[H^{+}\right]<\sqrt{K_{w}}\) and \(\left[O H^{-}\right]>\sqrt{K_{w}}\)

D

For a neutral solution \(\left[H^{+}\right]=\left[O H^{-}\right]=10^{-7} M\) at all temperatures

Solution

The statement [d] is applicable only at 25^∘C and is not independent of temperature.
Question 2
1 / -0

M₂SO₄ (M⁺is a monovalent metal ion) has a K. of 3.2×10⁻⁵ at 298 K. The maximum concentration of SO⁻²₄ ion that could be attained in a saturated solution of this solid at 298 K is

A
3×10⁻³ M

B
7×10⁻² M

C
2.89 × 10⁻⁴ M

D
2×10⁻² M

Solution

The maximum concentration of \(S O_{4}^{-2}\) will be same as the solubility of \(M_{2} S O_{4} ;\) If solubility is \(L^{-1}\)mol\(L^{-1} M_{2} S O_{4} 2 M^{+}+S O_{4}^{-2} K_{s p}=4 x^{3}\), therefore
\(\left.x=\left(K_{s p} / 4\right)^{1 / 3}\left[S O_{4}^{-2}\right]=x=\left(K_{s p} / 4\right)^{1 / 3}=\left[3.2 \times 10^{-5}\right] / 4\right]^{1 / 3}=2 \times 10^{-2} M\)
Question 3
1 / -0

The electrolyte most effective for bringing about coagulation of Fe(OH)₃ sol is

A
K₄[Fe(CN)₆]

B
BaCl₂

C
NaCl

D
None

Solution

\(F e(O H)_{3}\) is positive sol. \(K_{3}\left[F e(C N)_{6}\right]\) will provide \(\left[F e(C N)_{6}\right]^{4-}\) for coagulation.
Question 4
1 / -0

Which of the following is not the extensive property?

A
Gibbs free energy

B
Enthalpy

C
Entropy

D
Viscosity

Solution

Viscosity is an intensive property.
Question 5
1 / -0

Directions: Based on following paragraph.
In certain polar solvents, \(\mathrm{PCl}_{\mathrm{s}}\) undergoes an ionization reaction in which \(\mathrm{Cl}^{-}\) ion leaves one \(\mathrm{PCl}_{5}\) molecule and attaches itself to another. \(2 \mathrm{PCl}_{5} \mathrm{PCl}_{4}^{+}+\mathrm{PCl}_{6}^{-}\)
Number of lone pairs around phosphorus inPCl \(_{5}, \mathrm{PCl}_{4}^{+}\) and \(\mathrm{PCl}_{6}^{-}\) are respectively

A
0, 1, 2

B
0, 0, 0

C
1, 2, 3

D
0, 2, 1

Solution
Question 6
1 / -0

The IUPAC name of acrylonitrile is

A
ethenyl nitrile

B
prop-2-en-l-cyanide

C
prop-2-en-l-nitrile

D
eth-1-en-l-nitrile

Solution
Question 7
1 / -0

A compound formed by elements A and B has a cubic structure in which A atoms are at the comers of the cube and B atoms are at the face centres. The formula for the compound is

A
A₂B₃

B
AB₃

C
A₃B

D
A₃B₂

Solution

Number of corner atom \((A)=8 \times \frac{1}{8}=1\) Number of face centre atom \((B)=6 \times \frac{1}{2}=3\) Hence, formula of the compound is \(A B_{3}\)
Question 8
1 / -0

A wedding ring presented to a bride contains 788 mg of gold and rest diamond. If the ring weighs 1 g the bride receives (At wt: Au = 197, C = 12)

A
more number of gold atoms

B
more number of carbon atoms

C
equal number of gold and carbon atoms

D
gold and carbon atoms in ratio of 4:1 approximately

Solution

Atomic mass of carbon is less and hence no. of mole will be more.
Question 9
1 / -0

Which of the following is not an actinide?

A
Curium

B
Californium

C
Uranium

D
Terbium

Solution

Elements after lanthanum i.e. from Ce (58) to Lu (71) are all lanthanides. Atomic number of Terbium is 65 and hence it is a lanthanide not an actinide.
Question 10
1 / -0

The vapour pressure of pure liquid solvent A is atm. When a nonvolatile substance B is added to the solvent, its vapour pressure drops to 0.60 atm. What is the mole fraction of component B in the solution?

A
0.75

B
0.25

C
0.40

D
0.60

Solution

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Chemistry Test - 32

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Chemistry Test - 32

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Question 1

For a netural solution \(\left[H^{+}\right]=\left[O H^{-}\right]=\sqrt{K_{w}}\)

For an acidic solution \(\left[H^{+}\right]>\sqrt{K_{w}}\) and \(\left[O H^{-}\right]<\sqrt{K_{w}}\)

For an alkaline solution \(\left[H^{+}\right]<\sqrt{K_{w}}\) and \(\left[O H^{-}\right]>\sqrt{K_{w}}\)

For a neutral solution \(\left[H^{+}\right]=\left[O H^{-}\right]=10^{-7} M\) at all temperatures

Solution

Question 2

3×10−3 M

7×10−2 M

2.89 × 10−4 M

2×10−2 M

Solution

Question 3

K4[Fe(CN)6]

BaCl2

NaCl

None

Solution

Question 4

Gibbs free energy

Enthalpy

Entropy

Viscosity

Solution

Question 5

0, 1, 2

0, 0, 0

1, 2, 3

0, 2, 1

Solution

Question 6

ethenyl nitrile

prop-2-en-l-cyanide

prop-2-en-l-nitrile

eth-1-en-l-nitrile

Solution

Question 7

A2B3

AB3

A3B

A3B2

Solution

Question 8

more number of gold atoms

more number of carbon atoms

equal number of gold and carbon atoms

gold and carbon atoms in ratio of 4:1 approximately

Solution

Question 9

Curium

Californium

Uranium

Terbium

Solution

Question 10

0.75

0.25

0.40

0.60

Solution

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3×10⁻³ M

7×10⁻² M

2.89 × 10⁻⁴ M

2×10⁻² M

K₄[Fe(CN)₆]

BaCl₂

A₂B₃

AB₃

A₃B

A₃B₂