Chemistry Test 164

Result

Chemistry Test 164

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Weekly Quiz Competition

Question 1
4 / -1

For following elements IE1 drops abruptly (Ga, In and Tl). This is due to

A
decrease in effective nuclear charge

B
removal of an electron from the singly occupied np-orbitals of Ga than the ns-orbitals of Zn, Cd and Hg

C
increase in atomic radius

D
None of the above

Solution
Question 2
4 / -1

The elements that can form interstitial hydrides are

A
alkali and alkaline earth metals

B
non-metals like halogens

C
metalloids

D
transition elements

Solution

Transition metals form interstitial hydrides when exposed to hydrogen. For example: Palladium absorbs hydrogen and forms palladium hydride
Question 3
4 / -1

Considering the elements, B, C, N, F and Si, the correct order of their non-metallic character is

A
F > N > C > B > Si

B
Si > C > B > N > F

C
B > C > Si > N > F

D
F > N > C > Si > B

Solution
Question 4
4 / -1

The solubility product of CuS, CdS and HgS are respectively. The solubility of these sulphides are in the order

A
CdS >HgS >CuS

B
HgS >CdS >CuS

C
CdS >CuS >HgS

D
CuS >CdS >HgS

Solution

Greater the solubility product, the greater is the solubility. Hence, the correct solubility order of these sulphides will be : CuS> CdS> HgS
Question 5
4 / -1

During the process of electrolytic refining of copper, some metals present as impurity settle as “anode mud”. These are

A
Se and Ag

B
Pb and Zn

C
Ag and Au

D
Fe and Ni

Solution

In the electrolytic refining of copper, the more electropositive impurities like Fe, Zn, Ni, Co etc., dissolve in the solution and less electropositive impurities such as Ag, Au and Pt collect below the anode in the form of anodic mud.
Question 6
4 / -1

The process which is related with the removal of sulphur present in the ore by heating it in the air is

A
roasting

B
annealing

C
calcination

D
smelting

Solution

Roasting is a process in metallurgy in which a sulphide ore is heated in air the process may convert a metal sulphide to a metal oxide or to a free metal.
Question 7
4 / -1

Temperature at which the equilibrium water vapour pressure is 1.00 bar, is

A
107°C

B
38°C

C
215°

D
240°

Solution
Question 8
4 / -1

The element which forms oxide in all the oxidation states from +1 to +5 is

A
P

B
Sb

C
N

D
As

Solution
Question 9
4 / -1

Which of the following does not give oxygen on heating?

A

B

C

D

Solution
Question 10
4 / -1

A colourless salt gives violet colour to bunsen flame and also turns moistured litmus paper blue. It is

A

B

C

D

Solution