The p-Block Elements Test

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The p-Block Elements Test - 38

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Weekly Quiz Competition

Question 1
1 / -0

A mixture of $$NH_4Cl$$ and $$NaCl$$ can be separated by

A
filtration

B
Distillation

C
Sublimation

D
Decantation

Solution

$$NH_4$$ undergoes sublimation while NaCI does not.
Question 2
1 / -0

The gas oxygen from thermal decomposition of $$\displaystyle (NH_4)_2 \, Cr_2 O_7 $$ :

A
Oxygen

B
Nitric oxide

C
Ammonia

D
Nitrogen

Solution

$$\displaystyle (NH_4)_2 \, Cr_2O_7 \, \overset{\Delta}{\longrightarrow} Cr_2O_3 + N_2 + 4H_2O $$
Question 3
1 / -0

In which one of the following processes is iron used as a catalyst in the preparation of ammonia gas?

A
Bayer's process

B
Haber's process

C
Froth floatation process

D
None of the above

Solution

Habers' process is an artificial nitrogen fixation process and is the main industrial procedure for the production of ammonia today. This process converts atmospheric nitrogen to ammonia by reaction with hydrogen using a metal catalyst like iron under high temperature and pressure.
Question 4
1 / -0

Which element forms maximum multiple bonds?

A
N

B
P

C
As

D
Bi

Solution

Nitrogen forms maximum multiple bonds.
For example, it forms $$N \equiv N$$ triple bond in dinitrogen.
Question 5
1 / -0

In Ostwald process of manufacturing of $$HNO_3$$ catalyst used is:

A
Mo

B
Fe

C
Mn

D
Pt

Solution

Ostwald process for manufacture of $$HNO_3$$,

$$4 NH_3 + 5O_2 \xrightarrow{Pt} 4NO + 6H_2O+ \Delta$$

$$2NO + O_2 \xrightarrow{50^o C} 2 NO_{2(g)}$$

$$4NO_2 + 2H_2O + O_2(g)\rightarrow 4HNO_3 $$

$$\therefore$$ Pt is used as catalyst in Ostwald process.

Option D is correct.
Question 6
1 / -0

The most favourable condition for the manufacture of $$NH_3$$ is:

A
high temperature and high pressure

B
low temperature and low pressure

C
high temperature and low pressure

D
low temperature and high pressure

Solution

$$N_{2(g)} + 3H_{2(g)} \rightleftharpoons 2NH_{3(g)}$$
$$\Delta H = - 92.38 $$ kj/mol
(i) The reaction is exothermic, so according to Le -Chatelier's principle it is favoured at low temperature.
(ii)The number of moles are decreasing in the reaction. According to Le-Chateliers principle such reactions are favoured at high pressure.
$$\therefore $$ Low temperature and high pressure are favourable conditions for formation of NH$$_3$$.
Question 7
1 / -0

In Haber process of Ammonia production the element used as catalytic promoter to increase the activity of Iron catalyst is .......................

A
NI (Nickel)

B
W (Tungston)

C
V (Vanadium)

D
Mo (Molybednum)

Solution

In Haber process of ammonia production the element used as catalytic promoter to increase the activity of Iron catalyst is Mo (Molybednum).
$$N_2+3H_2 \rightleftharpoons 2NH_3 + 24 \quad kcal$$
The temperature is $$450^oC$$ and the pressure is 200-250 atm.
Question 8
1 / -0

Generally non-metals are non-lustrous. Exception to this property is-

A
Flourine

B
Chlorine

C
Bromine

D
Iodine

Solution

Lime water is calcium hydroxide and is a base so it turns phenolphthalein solution (an indicator) pink.
Question 9
1 / -0

Which of the following has more acidic in nature?

A
HClO

B
HClO$$_2$$

C
HClO$$_3$$

D
HClO$$_4$$

Solution

Acidity of oxyacids of halogen increases with increase in oxidation number of halogen Oxidation number of CI in HCIO is + 1, HCIO$$_2$$ is +3, HClO$$_3$$ is + 5 and HCIO$$_4$$ is + 7.
$$\therefore$$ HClO$$_4$$ is most acidic among given choices.
Question 10
1 / -0

An element X combines with hydrogen to form a compound $$XH_3$$. The element X is placed on the right side ofthe periodic table. What is true about the element X?
A. Has 3 valence electrons.
B. Is a metal and is solid.
C. Is a non-metal and is a gas.
D. Has 5 valence electrons.
E. $$XH_3$$ reacts with water to form a basic compound?

A
A, B and C

B
B,C and D

C
C, D and E

D
E, A and B

Solution

Here, $$X$$ is nitrogen with atomic number 7 and electronic configuration $$ { 1s }^{ 2 }{ 2s }^{ 2 }{ 2p }^{ 3 } $$
It is a non metal belonging to group 15.
Solution of ammonia In water is alkaline in nature and is highly soluble in water.

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 38

Result

The p-Block Elements Test - 38

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SHARING IS CARING

Question 1

filtration

Distillation

Sublimation

Decantation

Solution

Question 2

Oxygen

Nitric oxide

Ammonia

Nitrogen

Solution

Question 3

Bayer's process

Haber's process

Froth floatation process

None of the above

Solution

Question 4

N

P

As

Bi

Solution

Question 5

Mo

Fe

Mn

Pt

Solution

Question 6

high temperature and high pressure

low temperature and low pressure

high temperature and low pressure

low temperature and high pressure

Solution

Question 7

NI (Nickel)

W (Tungston)

V (Vanadium)

Mo (Molybednum)

Solution

Question 8

Flourine

Chlorine

Bromine

Iodine

Solution

Question 9

HClO

HClO$$_2$$

HClO$$_3$$

HClO$$_4$$

Solution

Question 10

A, B and C

B,C and D

C, D and E

E, A and B

Solution

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