Chemistry Test 167

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Chemistry Test 167

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Weekly Quiz Competition

Question 1
4 / -1

In the given reaction

The X is

A

B

C

D

Solution

A doubly bonded carbon atom having an alkyl group is oxidised to aldehyde which is further oxidised to carboxylic acid.
Question 2
4 / -1

High concentration of which of the following in atmosphere leads to stiffness of flower buds which eventually fall off from plants?

A
NO₂

B
SO₂

C
CFC

D
Smog

Solution

High concentration of SO₂ leads to stiffness of flower buds.
Question 3
4 / -1

If Germanium crystallises in the same way as diamond, then which of the following statement is not correct?

A
Every atom in the structure is tetrahedrally bonded to 4 atoms.

B
Unit cell consists of 8 Ge atoms and co-ordination number is 4.

C
All the octahedral voids are occupied.

D
All the octahedral voids and 50% tetrahedral voids remain unoccupied.

Solution

All the octahedral voids are occupied.
Question 4
4 / -1

The solubility of a solid in a liquid is significantly affected by temperature changes.

The system being in a dynamic equilibrium must follow Le-chatelier’s principle. Considering the Le-chatelier’s principle which of the following is correct?

A

B

C

D

Solution

According to Le-chateliers principle, for an exothermic reaction (H< 0) increase in temperature decreases the solubility.
Question 5
4 / -1

Which of the following expressions correctly represents the equivalent conductance at infinite dilution of are the equivalent conductances at infinite dilution of the respective ions?

A

B

C

D

Solution

Conductivity of an electrolyte depends on the mobility of ions and concentration of ions. The motion of an ionic species in an electric field is retarded by the oppositely charged ions due to their interionic attraction. On dilution, concentration of electrolyte decreases and the retarding influence of oppositely charged ions decreases. Therefore mobility of ions increases.
Question 6
4 / -1

The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation, of the reaction can be calculated by plotting

A

B

C

D

Solution
Question 7
4 / -1

Which of the following electrolytes is least effective in coagulating ferric hydroxide solution?

A
KBr

B

C

D

Solution

Smaller the charge on anion, lesser will be its coagulating power.

KBr have Br– with least charge of – 1 on Br thus KBr is least effective in coagulating
Question 8
4 / -1

Identity x, y, z for the following metallurgical process.

x, y and z are respectively

A
roasting, smelting, electrolysis

B
roasting, calcination, smelting

C
calcination, auto-reduction, bassemerisation

D
none of the above is correct

Solution

The conversion of metal sulphide to metal oxide involves the process of roasting (i.e., x is roasting). The metal oxides can then be converted to impure metal by reduction. Of the given choices in (a) and (b) the reduction process is that of smelting. (i.e., ‘y’ is smelting) The conversion of impure metal to pure metal involves a process of purification. Thus it is electrolysis.
Question 9
4 / -1

The oxyacid of phosphorous in which phosphorous has the lowest oxidation state is

A
hypophosphorous acid

B
orthophosphoric acid

C
pyrophosphoric acid

D
metaphosphoric acid

Solution

Hypophosphorous acid is H3PO2 in which O.S. of P is +1.
Question 10
4 / -1

Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

A

B

C

D

Solution