The p-Block Elements Test

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The p-Block Elements Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

Which one of these group off elements is also called the halogen family?

A
Group 16

B
Group 18

C
Group 10

D
Group 17

Solution

Group 17 is also called halogen family.
Question 2
1 / -0

Which element is monoatomic gas at room temperature?

A
$$Ne$$

B
$$F$$

C
$$O_2$$

D
$$N_2$$

Solution

Ne is noble gas so it will exists as monoatomic gas at room temperature.
All other gases exists in dimer form as $$F_2, N_2\ $$and$$\ O_2$$.
Question 3
1 / -0

Among these ores the highest phosphorus content is in :

A
chlorapatite

B
phosphorite

C
fluorspar

D
all have equal content

Solution

Phosphorite ore is the ore that has the highest phosphorus content.
Percentage of $$P$$ in phosphorite
$$=\frac {62}{279}\times 100=22.22$$%
In flourapatite and chlorapatite the percentage content of phosphorus is 20.32% and 19.62% respectively.
Question 4
1 / -0

Which is the most thermodynamically stable allotropic form of phosphorus?

A
Red

B
White

C
Black

D
Yellow

Solution

Black phosphorus is the most thermodynamically stable allotropic form of phosphorus.
Question 5
1 / -0

Essential constituents of plants and animal tissues are :

A
N and P

B
N and As

C
Cu and Mg

D
Ca and Mg

Solution

Nitrogen (N), phosphorus (P) and potassium (K) are present in plant tissue in quantities from 0.2% to 4.0% (on a dry matter weight basis).
Question 6
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The most abundant element in the atmosphere is :

A
Phosphorus

B
Oxygen

C
Nitrogen

D
Carbon

Solution

The most abundant element in the atmosphere is nitrogen.

Atmosphere contains 78% nitrogen.
Question 7
1 / -0

Which of the following non-metals belongs to the halogen family?

A
Flourine

B
Chlorine

C
Bromine

D
All of the above

Solution

Elements of 17th group are called halogens. It contains fluorine(F), Chlorine(Cl), Bromine(Br), Iodine(I) and Astatine(At).
Hence the answer will be D (theoritical).
Question 8
1 / -0

Which of the following is a noble gas?

A
$$He$$

B
$$N_2$$

C
$$H_2$$

D
$$O_2$$

Solution

$$He$$ is a noble gas with 2 electrons in outer shell.
Question 9
1 / -0

Phosphorus normally exhibits a covalency of :

A
$$+3$$ and $$+5$$

B
$$+2$$ and $$+3$$

C
$$+1$$ and $$+2$$

D
$$+3$$ and $$+4$$

Solution

Phosphorous acid $${ H }_{ 3 }{ PO }_{ 3 }$$, metaphosphorous acid $$ HPO _{ 2 } $$ has $$+3$$ oxidation state.
Pyrophosphoric acid $${ H }_{ 4 }{ P }_{ 2 }{ O }_{ 7 }$$, orthophosphoric acid $$H _{ 3 }{ PO }_{ 4}$$ has $$+5$$ oxidation state.
Question 10
1 / -0

An element X combines with hydrogen to form a compound $$NH_3$$. The element X is placed on the right side of the 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) $$NH_3$$ 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

X is N because it is placed on the right side of the periodic table & compound is $$NH_3$$. X is a non metal and valence electrons are $$5$$ & $$NH_3+H_2O\rightarrow NH_4OH$$(Base)

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 23

Result

The p-Block Elements Test - 23

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SHARING IS CARING

Question 1

Group 16

Group 18

Group 10

Group 17

Solution

Question 2

$$Ne$$

$$F$$

$$O_2$$

$$N_2$$

Solution

Question 3

chlorapatite

phosphorite

fluorspar

all have equal content

Solution

Question 4

Red

White

Black

Yellow

Solution

Question 5

N and P

N and As

Cu and Mg

Ca and Mg

Solution

Question 6

Phosphorus

Oxygen

Nitrogen

Carbon

Solution

Question 7

Flourine

Chlorine

Bromine

All of the above

Solution

Question 8

$$He$$

$$N_2$$

$$H_2$$

$$O_2$$

Solution

Question 9

$$+3$$ and $$+5$$

$$+2$$ and $$+3$$

$$+1$$ and $$+2$$

$$+3$$ and $$+4$$

Solution

Question 10

(a), (b) and (c)

(b), (c) and (d)

(c), (d) and (e)

(e), (a) and (b)

Solution

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