Chemistry Test 193

Result

Chemistry Test 193

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Weekly Quiz Competition

Question 1
4 / -1

A
348, 297, 260

B
297, 348, 260

C
348, 260, 297

D
260, 297, 348

Solution

The linking of identical atoms with each other to form long chains is called catenation. However, this property decreases from carbon to lead. Decrease of this property is associated with M-M bond energy which decreases from carbon to lead.
Question 2
4 / -1

A

B

C

D

Solution
Question 3
4 / -1

A
1, 4-dibromo-2-butene

B
1, 3-dibromo-2-butene

C
3, 4-dibromo-1-butene

D
2, 3-dibromo-2-butene

Solution
Question 4
4 / -1

Which one of the following statement is not true ?

A
pH of drinking water should be between 5.5 – 9.5.

B
Concentration of DO below 6 ppm is good for the growth of fish.

C
Clean water would have a BOD value of less than 5 ppm.

D
Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant.

Solution

The ideal value of D.O for growth of fishes is 8 mg/l . 7mg /l is desirable range, below this value fishes get susceptible to disease. A value of 2 mg/ l or below is lethal for fishes.
Question 5
4 / -1

A

B

C

D

Solution
Question 6
4 / -1

A
48% HCl

B
22.2% HCl

C
36% HCl

D
20.2% HCl

Solution
Question 7
4 / -1

In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

A
produce high purity water

B
create potential difference between two electrodes

C
generate heat

D
remove adsorbed oxygen from electron surfaces

Solution
Question 8
4 / -1

Which of the following statements is incorrect?

A
Activation energy for the forward reaction equals to activation energy for the reverse reaction

B
For a reversible reaction, an increase in temperature increases the reaction rate for both the forward and the backward reaction

C
The larger the initial reactant concentration for a second order reaction, the shorter is its half-life.

D
When Dt is infinitesimally small, the average rate equals the instantaneous rate

Solution
Question 9
4 / -1

At high pressure, the entire surface gets covered by a monomolecular layer of the gas follows

A
three-halved order

B
second-order

C
first-order

D
zero-order

Solution

At high pressure the extent of adsorption follows zero order kinetics.
Question 10
4 / -1

Before introducing FeO in blast furnace, it is converted to Fe₂O₃ by roasting so that

A
it may not be removed as slag with silica

B
it may not evaporate in the furnace

C
presence of it may increase the m.pt. of charge

D
None of these.

Solution