Chemistry Test 164

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Chemistry Test 164

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Weekly Quiz Competition

Question 1
4 / -1

0.15 M aqueous solution of potassium sulfate has on osmotic pressure of 8.21 atm at 27ºC. Which of the following is correct about the properties of solution?

A
The value of Van't Hoff factor of K₂SO₄ is 3.

B
The value of Van't Hoff factor for K₂SO₄ is less than 3 due to partial dissociation of solute.

C
The value of Van't Hoff factor for K₂SO₄ is more than 3 due to complete dissociation of solute.

D
The freezing point of solution would be more than 0°C.

Solution

π = i.CRT

i = = 2.22
Question 2
4 / -1

A solution is made by equilibrating the two solids barium sulfite (K_sp = 8 × 10^–7) and barium sulfate (K_sp = 1.0 × 10^–8) with water. What are the concentrations of the three ions at equilibrium, if some of each of the solid remains ?

A
[Ba²⁺] = 9 × 10^–4M

B
× 10^–3M

C
× 10^–3M

D
All are correct.

Solution

Let solubility barium sulphite is x mol/L and that of barium sulphate is y mol/L.

(x + y)x = 8 × 10^–7
(x + y)y = 1 × 10^–8
Question 3
4 / -1

Which of the following combinations in an aqueous medium will give a red colour or precipitate?

A
Fe²⁺ + [Fe (CN)₆]^3-

B
Co²⁺ + SCN^–

C
Cu²⁺ + OH^–

D
Fe³⁺ + SCN^–

Solution

Fe(SCN)₃ is red colour
Question 4
4 / -1

The value of CFSE of the complex formed in Brown ring test is :

A
–1.8Δ₀

B
–2.4 Δ₀

C
–0.4Δ₀

D
–0.8Δ₀

Solution

Brown ring complex is [Fe(H₂O)₅(NO)]⁺²
Question 5
4 / -1

Directions For Questions

...view full instructions

Which of the following statement is correct, based on the information given above?

A
O₂ oxidizes Mn²⁺ to Mn³⁺

B
Mn³⁺ oxidizes H₂O to O₂

C
O₂ oxidizes both Mn²⁺ to Mn³⁺ and Fe²⁺ to Fe³⁺

D
O₂ can not oxidizes Fe²⁺ to Fe³⁺
Question 6
4 / -1

Which of the following relationship between radii of Gallium and nitrogen in GaN and the lattice parameter, for gallium nitride is correct ? Gallium nitride has hcp lattice of nitride ions and Ga³⁺ occupying half of the tetrahedral voids, without disturbing the lattice of N^3– ion

A
c =

B

C
a = 2 ×

D
a = 0.89
Question 7
4 / -1

P is the probability of finding the 2s electron of hydrogen atom in a spherical shell of infinitesimal thickness, dr at a distance r from nucleus, the volume of this shell is 4πr²dr. The qualititative sketch of the dependence of (P/dr) on r is

A

B

C

D

Solution

Sketch for 2s orbital is
Question 8
4 / -1

Which one of the following is pyrosilicate?

A
Forsterite

B
Hemimorphite

C
Barysilite

D
Thortveitite

Solution

Hemimorphite is pyrosilicate.
Question 9
4 / -1

Among the following, the incorrect statement is

A
P₄O₁₀ is an oxidizing agent

B
P₄O₁₀ is an simple anhydride of H₃PO₄

C
When P₄O₁₀ react with HNO₃ than N₂O₅ and HPO₃ are formed

D
P₄O₁₀ is a dehydrating agent.

Solution

P₄O₁₀ is not an oxidizing agent

P₄O₁₀ + NaCl → POCl₃ + NaPO₄
Question 10
4 / -1

Among the following, sulphate ore is

A
Zinc blende

B
Barytes

C
Pitch blende

D
Dolomite

Solution

Barytes is a sulphate ore.