Chemistry Test 171

Result

Chemistry Test 171

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Weekly Quiz Competition

Question 1
4 / -1

Orthoboric acid when heated to red hot gives

A
metaboric acid

B
pyroboric acid

C
boron and water

D
boric anhydride

Solution
Question 2
4 / -1

The correct statement regarding the comparison of staggered and eclipsed conformation of ethane, is

A
The staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain

B
The eclipsed conformation of ethane is more stable than staggered conformation, because eclipsed conformation has no torsional strain

C
The eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain

D
The staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain.

Solution

In staggered conformation any two hydrogen atoms on adjacent carbon atoms are as far apart as possible thereby minimizing repulsion between the electron clouds of s-bonds of two non-bonded H-atomic(torsional strain)
Question 3
4 / -1

Which of the following chemical system is non-aromatic?

A

B

C

D

Solution

Huckel rule is not obeyed. It has only four electrons. Further it does not have continuous conjugation.
Question 4
4 / -1

Phosphate fertilizers when added to water leads to

A
increased growth of decomposers

B
reduced algal growth

C
increased algal growth

D
nutrient enrichment (eutrophication)

Solution

Addition of phosphate fertilizers to water leads to nutrient enrichment (eutrophication)
Question 5
4 / -1

The ratio of inner planar distances of three types of planes for simple cubic lattice are

A

B

C

D

Solution
Question 6
4 / -1

Which of the following modes of expressing concentration is independent of temperature?

A
Molarity

B
Molality

C
Formality

D
Normality

Solution

The molality involves weights of the solute and the solvent. Since weight does not change with the temperature, therefore molality does not depend upon the temperature.
Question 7
4 / -1

Standard electrode potential data are useful for understanding the suitability of an oxidant in a redox titration. Some half-cell reactions and their standard potentials are given below:

A

B

C

D

Solution
Question 8
4 / -1

Consider a reaction aG + bH Products. When concentration of both the reactants G and H is doubled, the rate increases by eight times. However, when concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall order of the reaction is

A
0

B
1

C
2

D
3

Solution

Overall order = sum of orders w.r.t each reactant.

Let the order hex and y for G and H respectively

∵ For (1) and (3), the rate is doubled when cone, of

G is doubled keeping that of H constant i.e.,

Rate ∝ [G] ∴ x = 1

From (2) and (3), y = 2

∴ Overall order is 3.
Question 9
4 / -1

Which of the following statements is incorrect?

A
Colloidal gold is used for intramuscular injection.

B
Colloidal solution of latex is used in preparation of rubber.

C
Photographic films are prepared by coating an emulsion of AgBr in gelatin over glass plate.

D
Tannin used in leather industry contains positively charged colloidal particles.

Solution

Tannin used in leather industry contains negatively charged colloidal particles.
Question 10
4 / -1

The method of zone refining of metals is based on the principle of

A
Greater solubility of the impurity in the molten state than in the solid

B
Greater mobility of the pure metal than that of the impurity

C
Higher melting point of the impurity than that of the pure metal

D
Greater noble character of the solid metal than that of the impurity

Solution

Zone refining is based on the difference in solubility of impurities in molten and solid state of the metal. This method is used for obtaining metals of very high purity.