The p-Block Elements Test

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The p-Block Elements Test - 55

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Weekly Quiz Competition

Question 1
1 / -0

Oxidation number of $$C$$ in $${C}_{6}{H}_{12}{O}_{6}$$ is

A
$$+6$$

B
$$-6$$

C
$$0$$

D
$$+4$$

Solution

$$C_6H_{12}O_6$$
$$6x+12-12=0$$
$$C$$ has oxidation number $$=0$$
Question 2
1 / -0

Oxidation number of carbon in $${H}_{2}{C}_{2}{O}_{4}$$ is

A
$$+4$$

B
$$+3$$

C
$$+2$$

D
$$-2$$

Solution

$${H}_{2}\overset { \ast }{ {C}_{2} } {O}_{4}$$

Let, $$x$$ be the oxidation number of carbon in $${H}_{2}{C}_{2}{O}_{4}.$$

Now,

$$2\times (+1)+2\times x+4\times(-2) =0;\ \Rightarrow x=+3$$
Question 3
1 / -0

The oxidation number of carbon in $${CH}_{2}O$$ is

A
$$-2$$

B
$$+2$$

C
$$0$$

D
$$+4$$

Solution

$$\overset { \ast }{ C } {H}_{2}O$$
$$x+2-2=0$$
$$x=0$$
Question 4
1 / -0

$$ B^{3+} $$ cannot exist in aqueous solution because of its

A
Strong reducing ability

B
Strong oxidizing ability

C
Small size and large charge

D
Large size and small charge

Solution

Being covalent in nature because of small size and large charge it gets hydrolysed in an aqueous solution. In other words, on account of higher charge density i.e. charge/size ratio, it gets hydrolysed forming $$H_{3}BO_{3} $$

$$ 2B^{3+} + 6H_{2}O \rightarrow 2 H_{3}BO_{3} + 6H^{+} $$

Hence, option C is correct.
Question 5
1 / -0

Oxidation state of elemental carbon is

A
$$0$$

B
$$1$$

C
$$2$$

D
$$3$$

Solution

Every element always shows zero oxidation state in the elemental stable form.
Question 6
1 / -0

Oxidation number of carbon in $${CH}_{3}-Cl$$ is

A
$$-3$$

B
$$-2$$

C
$$-1$$

D
$$0$$

Solution

$$\overset { \ast }{ C } {H}_{3}-Cl$$
$$x+3(+1)+(-1)\times 1=0;x=-2$$
Question 7
1 / -0

The oxidation number of carbon in $${CH}_{2}{Cl}_{2}$$ is

A
$$0$$

B
$$+2$$

C
$$-2$$

D
$$+4$$

Solution

$$\overset { \ast }{ C } {H}_{2}{Cl}_{2}$$

Let, $$x$$ be the oxidation number of carbon in $${CH}_{2}{Cl}_{2}.$$

Now,

$$x+2\times(+1)+2\times(-1)=0;\ \Rightarrow x=0$$
Question 8
1 / -0

Thallium shows different oxidation states because

A
it is a transition metal

B
of inert-pair effect

C
of its high reactivity

D
of its amphoteric character

Solution

Thallium shows different oxidation states because of inert-pair effect.
Hence, Option "B" is the correct answer.
Question 9
1 / -0

How many ionisation energies can carbon have

A
$$1$$

B
$$2$$

C
$$4$$

D
$$6$$

Solution

Carbon has total of 6 electrons and all 6 can be removed.
Question 10
1 / -0

Carbon containing molecules present in all life forms includes:

A
Carbon dioxide, carbonates and hydrogen carbonates

B
Nucleic acids, carbon dioxied, carbonates and hydrogen carbonates

C
Proteins, carbohydrates, fats, nucleic acids and vitamins

D
Hormones, carbohydrates, Carbonates and hydrogen carbonates

Solution

Being an organic molecule, carbon acts as a key element of nucleic acids.
Carbon atoms appear in the sugar of the nucleic acid backbone, and the nitogenous bases. Carbon dioxide consists of a carbon atom covalently double bonded to two oxygen atoms. Carbon dioxide is soluble in water, in which it readily and reversibly converts to carbonic acid. The conjugate bases of a carbonic acid are known as the bicarbonate and carbonate ions.

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 55

Result

The p-Block Elements Test - 55

Score

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Rank

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SHARING IS CARING

Question 1

$$+6$$

$$-6$$

$$0$$

$$+4$$

Solution

Question 2

$$+4$$

$$+3$$

$$+2$$

$$-2$$

Solution

Question 3

$$-2$$

$$+2$$

$$0$$

$$+4$$

Solution

Question 4

Strong reducing ability

Strong oxidizing ability

Small size and large charge

Large size and small charge

Solution

Question 5

$$0$$

$$1$$

$$2$$

$$3$$

Solution

Question 6

$$-3$$

$$-2$$

$$-1$$

$$0$$

Solution

Question 7

$$0$$

$$+2$$

$$-2$$

$$+4$$

Solution

Question 8

it is a transition metal

of inert-pair effect

of its high reactivity

of its amphoteric character

Solution

Question 9

$$1$$

$$2$$

$$4$$

$$6$$

Solution

Question 10

Carbon dioxide, carbonates and hydrogen carbonates

Nucleic acids, carbon dioxied, carbonates and hydrogen carbonates

Proteins, carbohydrates, fats, nucleic acids and vitamins

Hormones, carbohydrates, Carbonates and hydrogen carbonates

Solution

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