Chemistry Test 162

Result

Chemistry Test 162

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Weekly Quiz Competition

Question 1
4 / -1

The favourable conditions for a spontaneous reaction are

A

B

C

D

Solution
Question 2
4 / -1

For the following reaction in gaseous phase

A

B

C

D

Solution
Question 3
4 / -1

Amongst the following, identify the species with an atom in + 6 oxidation state:

A

B

C

D

Solution

If an electronegative element is in its lowest possible oxidation state in a compound or in free state. It can function as a powerful reducing agent.

e.g. I–
Question 4
4 / -1

Which of the following is not a use of dihydrogen?

A
It used in fuel cells for generating electrical energy.

B
Atomic hydrogen and oxy-hydrogen torches are used for cutting and welding purposes.

C
It used in the synthesis of hydroquinone and tartaric acid.

D
Both (b) and (c)

Solution

Hydrogen is not used in the synthesis of hydroquinone and tartaric acid.
Question 5
4 / -1

All of the following substances react with water. The pair that gives the same gaseous product is

A

B

C

D

Solution
Question 6
4 / -1

Soldiers of Napolean army while at alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to

A
a change in the partial pressure of oxygen in the air

B
a change in the crystalline structure of tin

C
an interaction with nitrogen of the air at very low temperatures

D
an interaction with water vapours contained in the humid air

Solution

(most common and stable) (Rhombic) Although transitions of white to grey tin occurs at any temperature below 15.2°C, it becomes rapid only at –50°C, unless a catalyst is present. During the conversion of white tin to grey tin (in cold countries) volume increases. Grey Sn is very brittle easily crumbles down to powder. This phenomenon is called tin diseases, tin past or tin plague.
Question 7
4 / -1

In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is:

A
18.20

B
16.76

C
15.76

D
17.36

Solution
Question 8
4 / -1

Acid catalyzed hydration of alkenes except ethene leads to the formation of

A
mixture of secondary and tertiary alcohols

B
mixture of primary and secondary alcohols

C
secondary or tertiary alcohol

D
primary alcohol

Solution
Question 9
4 / -1

B.O.D. test or biochemical oxygen demand test is made for measuring

A
air pollution

B
water pollution

C
noise pollution

D
soil pollution

Solution

Strength of sewage or degree of water pollution is measured in terms of BOD (Biochemical oxygen demand) value.
Question 10
4 / -1

A
ZnS is 4: 4 coordination compound.

B
ZnS does not crystallize in rock salt type lattice because is too small to avoid overlapping of S^2- ions.

C
Zn²⁺ion is too small to fit precisely into the octahedral voids of S^2- ions.

D
Zn²⁺ion is too large to fit into the octahedral voids of S^2- ions.