The p-Block Elements Test

Result

The p-Block Elements Test - 72

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Weekly Quiz Competition

Question 1
1 / -0

Silica is reacted with sodium carbonate. Which gas liberated?

A
$$CO$$

B
$$O_2$$

C
$$CO_2$$

D
$$O_3$$

Solution
Question 2
1 / -0

Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding:

A
$$MeSiCl_3$$

B
$$Me_2SiCl$$

C
$$Me_3SiCl$$

D
$$Me_4Si$$

Solution
Question 3
1 / -0

In silica $$SiO_2$$, each silicon atom is bonded to:

A
two oxygen atoms

B
four oxygen atoms

C
one silicon and two oxygen atoms

D
one silicon and four oxygen atoms

Solution
Question 4
1 / -0

Which is likely to show inert pair effect?

A
$$K$$

B
$$Mg$$

C
$$Al$$

D
$$Pb$$

Solution
Question 5
1 / -0

Which one of the following is wrong?

A
Oxygen and sulphur belong to the same group of periodic table

B
Oxygen is a gas while sulphur is solid

C
Both show $$+2,+4$$ and $$+6$$ oxidation states

D
$$H_{2}S$$ has no hydrogen bonding

Solution
Question 6
1 / -0

Which of the following is not correct?

A
Hydrolysis of $$NCl_3$$ gives $$NH_3$$ and $$HClO$$

B
$$NH_3$$ is less stable than $$PH_3$$

C
$$NH_3$$ is a weak reducing agent compared to $$PH_3$$

D
Nitric oxide in solid state exhibits diamagnetic property

Solution
Question 7
1 / -0

$${ SiCl }_{ 4 }\xrightarrow [ ]{ { H }_{ 2 }O } X\xrightarrow [ ]{ 1000^0C } Y$$
In the above reaction, $$X$$ and $$Y$$ respectively are:

A
$$SiO_2$$ and $$Si$$

B
$$H_4SiO_4$$ and $$SiO_2$$

C
$$H_2SiCl_6$$ and $$SiO_2$$

D
$$H_4SiO_4$$ and $$Si$$

Solution
Question 8
1 / -0

Silica is reacted with sodium carbonate. What is the gas liberated?

A
$$CO$$

B
$$O_2$$

C
$$CO_2$$

D
$$O_3$$

Solution

When silica is reacted with sodium carbonate, it gives sodium silicate and carbon dioxide gas is liberated.The addition of $$SiO_{2} $$ greatly enhanced the decomposition of $$Na_{2}CO_{3}$$.

The reaction is given as:
$$SiO_{2} + Na_{2}CO_{3} \rightarrow Na_{2}SiO_{3} + CO_{2}$$

As the gas liberated is $$CO_{2}$$.
Hence, the correct option is (C).
Question 9
1 / -0

Which of the following is correct?

A
Silicones are organosilico polymers containing $$Si-O-Si$$ linkage.

B
$$R_3SiCl$$ on hydrolysis gives $$R_3Si-O-SiR_3$$

C
Both

D
None

Solution
Question 10
1 / -0

An inorganic compound $$(A)$$ made of two most occurring elements in the earth's crust and used in building construction when made to react with carbon, forms a poisonous gas $$(B)$$ which is most stable diatomic molecule. Compound $$(A)$$ and $$(B)$$ are:

A
$$SiO_2, CO_2$$

B
$$SiO_2, CO$$

C
$$SiO_2, N_2$$

D
$$CaO, CO_2$$

Solution

$$SiO_2$$ is a compound of oxygen and silicon, the two most abundant elements of earth's crust and is used in building construction.

$$SiO_2 +2C\longrightarrow Si+2CO$$ (piosonous gas and a stable diatomic molecule)

Option B is correct.