Chemistry Test

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Chemistry Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

When a beam of light is passed through a colloidal solution, it

A
is reflected

B
is scattered

C
passes through undeviated

D
is completely absrbed

Solution

When a beam of light is passed through a colloidal solution, it gets scattered due to tyndall effect.
Question 2
1 / -0

Colloidal medicines are more effective because

A
they are clean

B
they are easy to prepare

C
the germs move towards them

D
they are easily assimilated and adsorbed

Solution

Medicines are more effective in colloidal state because colloids have a larger surface area. Thus, they get easily assimilated, absorbed and digested.
Question 3
1 / -0

A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to

A
log k

B
n

C
1/n

D
log n

Solution

Straight line equation is formed in this case.
log x/m = log x + 1/n log P
So, Y = C + mx
So, the slope is equal to 1/n.
Question 4
1 / -0

The catalyst used in lead chamber process is

A
HCl

B
V₂O₅

C
NO

D
Pt

Solution

Nitric oxide is used as catalyst in lead chamber process.
Question 5
1 / -0

What is the increasing order of the first ionisation enthalpies of the elements B, P, S and F?

A
B<S<P<F

B
F<S<P<B

C
P<S<B<F

D
B<P<S<F

Solution

The value of first ionization energy decreases on moving from top to bottom in a group and increases on moving from left to right across a period in the periodic table.
Question 6
1 / -0

Which of the following statements is correct?

A
Among alkali metals, the reactivity increases down the group, but among halogens it decreases with increase in atomic number down the group.

B
Among alkali metals, the reactivity decreases down the group, but among halogens it increases with increase in atomic number down the group.

C
In both alkali metals and halogens, the reactivity decreases with increase in atomic number down the group.

D
In both alkali metals and halogens, the reactivity increases with increase in atomic number down the group.

Solution

Alkali metals are electropositive and have a tendency to lose electrons. On moving down the group, the ionisation energy decreases and metallic character increases.
Halogens react by accepting the electrons. On moving down the group, the tendency to accept an electron decreases due to decrease in electronegativity. Therefore, the reactivity decreases down the group.
Question 7
1 / -0

Diagonal relationship in the periodic table is shown by the elements of

A
first and second periods

B
second and third periods

C
third and fourth periods

D
None of these

Solution

A diagonal relationship is said to exist between certain pairs of diagonally adjacent elements in the second and third periods of the periodic table.
Question 8
1 / -0

Man-made elements belong to _____ series.

A
actinide

B
lanthanide

C
halogen

D
inert gas

Solution

Out of all the actinides, thorium and uranium occur naturally in substantial, primordial quantities and small amounts of persisting natural plutonium have also been identified. The radioactive decay of uranium produces transient amounts of actinium and protactinium. The atoms of neptunium, americium, curium, berkelium and californium are occasionally produced from transmutation reactions in uranium ores. The other actinides are purely synthetic elements.
Question 9
1 / -0

Choose the correct order of the first ionisation energies of the corresponding elements.

A
Li > Na > K

B
K > Li > Na

C
Na > Li > K

D
Li > K > Na

Solution

The correct order will be Li > Na > K as the value of the first ionisation energy decreases on moving down the group in the periodic table.
Question 10
1 / -0

Starch is converted to ethanol by fermentation. What is the sequence of enzymes used?

A
Amylase, maltase, zymase

B
Diastase, maltase, zymase

C
Amylase, invertase, zymase

D
Amylase, zymase, maltase

Solution

During fermentation of starch, it is first hydrolyzed to maltose by the action of the enzyme diastase.

The enzyme diastase is obtained from germinated barley seeds. Maltose is converted to glucose by the enzyme maltase. Glucose is converted to ethanol by another enzyme, zymase.
Question 11
1 / -0

Which of the following is the only amino acid which is non-chiral?

A
Lysine

B
Proline

C
Glycine

D
Histidine

Solution
Question 12
1 / -0

How many hydrogen bonds are present between a pair of thymine and adenine in DNA?

A
1

B
2

C
3

D
No bond is present

Solution

Adenine and thymine form two hydrogen bonds.
Question 13
1 / -0

On hydrolysis, which of the following produces only glucose?

A
Lactose

B
Maltose

C
Sucrose

D
None of these

Solution

Maltose is converted to glucose by enzyme maltase.
Question 14
1 / -0

Which of the following indicates open chain structure of glucose?

A
Penta-acetyl derivative of glucose

B
Cyanohydrin formation with HCN

C
Reaction with Fehling solution

D
Reaction with Tollen's reagent

Solution

Pentacetyl formation of glucose indicates that the latter contain 5–OH groups, indicating the open chain structure of glucose.
Question 15
1 / -0

Biotin is an organic compound present in yeast. Its deficiency in diet causes dermatitis and paralysis. It is also known as

A
vitamin H

B
vitamin B₃

C
vitamin B₁₂

D
vitamin D

Solution

Biotin, also known as vitamin H or co-enzyme R, is a water-soluble B-complex vitamin (vitamin B7).

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Re-Attempt Weekly Quiz Competition

Chemistry Test - 5

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Chemistry Test - 5

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SHARING IS CARING

Question 1

is reflected

is scattered

passes through undeviated

is completely absrbed

Solution

Question 2

they are clean

they are easy to prepare

the germs move towards them

they are easily assimilated and adsorbed

Solution

Question 3

log k

n

1/n

log n

Solution

Question 4

HCl

V2O5

NO

Pt

Solution

Question 5

B<S<P<F

F<S<P<B

P<S<B<F

B<P<S<F

Solution

Question 6

Among alkali metals, the reactivity increases down the group, but among halogens it decreases with increase in atomic number down the group.

Among alkali metals, the reactivity decreases down the group, but among halogens it increases with increase in atomic number down the group.

In both alkali metals and halogens, the reactivity decreases with increase in atomic number down the group.

In both alkali metals and halogens, the reactivity increases with increase in atomic number down the group.

Solution

Question 7

first and second periods

second and third periods

third and fourth periods

None of these

Solution

Question 8

actinide

lanthanide

halogen

inert gas

Solution

Question 9

Li > Na > K

K > Li > Na

Na > Li > K

Li > K > Na

Solution

Question 10

Amylase, maltase, zymase

Diastase, maltase, zymase

Amylase, invertase, zymase

Amylase, zymase, maltase

Solution

Question 11

Lysine

Proline

Glycine

Histidine

Solution

Question 12

1

2

3

No bond is present

Solution

V₂O₅

vitamin B₃

vitamin B₁₂