The p-Block Elements Test

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The p-Block Elements Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is the correct formulae of
borax ?

A
$$Na[B_{4}O_{5}\left ( OH \right )_{4}].2H_{2}O$$

B
$$Na[B_{4}O_{5}\left ( OH \right )_{4}].4H_{2}O$$

C
$$Na[B_{4}O_{5}\left ( OH \right )_{4}].6H_{2}O$$

D
$$Na_{2}[B_{4}O_{5}\left ( OH_{} \right )_{4}].8H_{2}O$$

Solution

Borax has 8 molecules of water of water of crystallisation.
Question 2
1 / -0

Borax is a:

A
tetra hydrate

B
hepta hydrate

C
deca hydrate

D
penta hydrate

Solution

Borax actually contains 10 molecules of water of crystallisation.

The formula of Borax is $$Na_2B_4O_7.10H_2O$$.

Option C is correct.
Question 3
1 / -0

Anhydrous borax is:

A
$$Na_{2}B_{4}O_{7}$$

B
$$Na_{2}B_{4}O_{7}\, .\: 5H_{2}O$$

C
$$Na_{2}B_{4}O_{7}\,. 10H_{2}O$$

D
$$Na_{2}B_{4}O_{7}.8H_{2}O$$

Solution

Anhydrous borax has formula $$Na_2B_4O_7$$.

Anhydrous means no water of crystallisation.

Option A is correct.
Question 4
1 / -0

Borax is known as :

A
Sodium borate.

B
Sodium tetra borate.

C
Disodium tetra borate.

D
All

Solution

Borax: $$Na_{2} [ B_{4} O_{5} (OH)_{4} ].8H_{2}O$$
Question 5
1 / -0

Which of the following elements can present both in cation and anion of its salts?

A
$$B$$

B
$$Al$$

C
$$Ga$$

D
$$Tl$$

Solution

Boron can only form cation of its salts.
$$Al$$ can form both cation and anion of its salts.
Example: $$Al^{3+}$$(cation) $$AlO_{3}^{3-}$$(Anion)
$$Ga$$ and $$Tl$$ can only form cation of their salts.
Question 6
1 / -0

In the aluminothermic process, aluminium acts as:

A
an oxidising agent

B
a.flux

C
a reducing agent

D
a solder

Solution

Aluminium gets oxidized.
The equation is,
$$2Al+Fe_{2}O_{3}\rightarrow 2Fe_{(molten)}+Al_{2}O_{3}$$
Question 7
1 / -0

Borax is the sodium salt of:

A
Ortho boric acid.

B
Meta boric acid.

C
Tetra boric acid.

D
Pyro boric acid.

Solution

Borax ($$Na_2B_4O_7.10H_2O$$) is sodium salt of tetraboric acid ($$H_2B_4O_7$$).
Question 8
1 / -0

The valencies of nitrogen and boron in borazole are :

A
$$3,3$$

B
$$4,4$$

C
$$3,4$$

D
$$4,3$$

Solution

Nitrogen and boron is forming 4 bonds thus they have 4 valence electron
Question 9
1 / -0

Which of the following property does not support anamolous behaviour of boron?

A
Small size

B
High electronegativity

C
High ionization energy

D
Formation of trihalides

Solution

Formation of trihalides does not support anomalous behaviour of boron as other elements of boron family also form trihalides such as $$\displaystyle AlCl_3 $$.
Question 10
1 / -0

Aqueous solution of borax is _______ in nature :

A
Neutral

B
Acidic

C
Alkaline

D
.None

Solution

The aqueous solution is alkaline due to hydrolisis resulting into the formation of strong base NaOH and weak acid tetraboric acid.

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 21

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The p-Block Elements Test - 21

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Question 1

$$Na[B_{4}O_{5}\left ( OH \right )_{4}].2H_{2}O$$

$$Na[B_{4}O_{5}\left ( OH \right )_{4}].4H_{2}O$$

$$Na[B_{4}O_{5}\left ( OH \right )_{4}].6H_{2}O$$

$$Na_{2}[B_{4}O_{5}\left ( OH_{} \right )_{4}].8H_{2}O$$

Solution

Question 2

tetra hydrate

hepta hydrate

deca hydrate

penta hydrate

Solution

Question 3

$$Na_{2}B_{4}O_{7}$$

$$Na_{2}B_{4}O_{7}\, .\: 5H_{2}O$$

$$Na_{2}B_{4}O_{7}\,. 10H_{2}O$$

$$Na_{2}B_{4}O_{7}.8H_{2}O$$

Solution

Question 4

Sodium borate.

Sodium tetra borate.

Disodium tetra borate.

All

Solution

Question 5

$$B$$

$$Al$$

$$Ga$$

$$Tl$$

Solution

Question 6

an oxidising agent

a.flux

a reducing agent

a solder

Solution

Question 7

Ortho boric acid.

Meta boric acid.

Tetra boric acid.

Pyro boric acid.

Solution

Question 8

$$3,3$$

$$4,4$$

$$3,4$$

$$4,3$$

Solution

Question 9

Small size

High electronegativity

High ionization energy

Formation of trihalides

Solution

Question 10

Neutral

Acidic

Alkaline

.None

Solution

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