Chemistry Test 198

Result

Chemistry Test 198

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Weekly Quiz Competition

Question 1
4 / -1

During the process of electrolytic refining of Copper which of the following may obtained as a anode mud?

A
Ag, Au

B
Ag, Zn

C
Fe, Ni

D
Zn, Ni

Solution

Ag, Au (due to less electropositive)
Question 2
4 / -1

How many moles of KOH are required per mole of R–NH₂ in the balanced reaction?

A
1

B
2

C
3

D
4

Solution
Question 3
4 / -1

An ionic solid 'AB' (M_w = 120 g/mol) has NaCl type structure. The shortest distance between cation and anion is 500 pm. If there is a schottky defect of 2% then the density of crystal in g / cm³ will be : (N_A = 6 ×10²³)

A
0.80

B
0.784

C
0.016

D
None of these

Solution

Shortest distance between cation and anion = a/2 = 500 pm

a = 1000 pm
Question 4
4 / -1

Which of the following metal is not commercially extracted by self reduction method from their corresponding ore?

A
Cu

B
Fe

C
Pb

D
Hg

Solution

Sulphide ore of Cu, Pb, Hg are reduced by self reduction.
Question 5
4 / -1

What is the major product of the given reaction sequence?

A

B

C

D

Solution
Question 6
4 / -1

At 27°C, the vapour pressure of an aqueous solution of urea is equal to the osmotic pressure of 5 × 10^–3 M aqueous solution of glucose. If vapour pressure of pure water at 27°C is 114 torr then the mole fraction of urea in its solution is - [Given : R = 0.08 L-atm/mol-K]

A
4/5

B
0.25

C
3/4

D
0.2

Solution

Vapour pressure of aquoeus solution of urea = 5 × 10^–3 × 0.08 × 300 (∵π = CRT)

= 0.12 atm

= 0.12 × 760 = 91.2 torr
Question 7
4 / -1

Select incorrect statement regarding silver extraction -

A
Cupellation process is used when Lead - Silver alloy is rich in Silver and Lead is removed.

B
Parke's and Pattinson's process is used when Lead Silver alloy is rich in lead.

C
Zinc forms alloy with Lead, from which Lead is separated by distillation.

D
Zinc forms alloy with Silver, from which Zinc is separated by distillation.

Solution
Question 8
4 / -1

What is the colour of the dye formed in the given reaction?

A
Red

B
Orange

C
Blue

D
Yellow

Solution
Question 9
4 / -1

In a solid compound, X-particles are present in ccp position, Y-particle are in all octahedral voids and Z-particles are in alternate tetrahedral voids. If all void- particles along one of the body-diagonal are removed then the formula of compound will be given as -

A
X₄Y₃Z₃

B
X₃Y₄Z₃

C
X₄Y₄Z₃

D
X₄Y₃Z₄

Solution

Z_x = 4

Z_y = 4

Z_z = 4
Question 10
4 / -1

During the extraction process of Copper, Silica is added to roasted ore, in order to remove.

A
cuprous sulphide

B
ferrous oxide

C
ferrous sulphide

D
cuprous oxide

Solution

FeS + O₂ (limited) → FeO + SO₂

FeO + SiO₂ (Flux) → FeSiO₃ (Slag)