Carbon and its Compounds Test

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Carbon and its Compounds Test - 37

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Weekly Quiz Competition

Question 1
1 / -0

Soft soap are

A
Sodium salt

B
Calcium salt

C
magnesium salt

D
potassium salt

Solution

Softsoap is semi-liquid or easily soluble soap made by saponification with potassium hydroxide instead of the more typical sodium hydroxide. Hence option (D) is correct.
Question 2
1 / -0

Which statement about bonding is not correct?

A
Carbon can form covalent bonds.

B
Chlorine atoms react to gain a noble gas electronic configuration.

C
Covalent bonding involves losing and gaining electrons.

D
Hydrogen molecules have the formula $$H_{2}$$.

Solution

Covalent bonding involves sharing of electrons. Losing and gaining of electrons is found in ionic bonding.
Question 3
1 / -0

When two pairs of electrons are shared, bond is

A
Single covalent bond

B
Double covalent bond

C
Dative bond

D
Triple bond

Solution

Answer $$(B)$$ Double covalent bond
A Double covalent bond is formed when two pairs of electrons are shared between the atoms rather than just one pair.
Question 4
1 / -0

Rectified spirit is a mixture of:

A
95% ethyl alcohol + 5% water

B
94% ethyl alcohol + 4.53% water

C
94.4% ethyl alcohol + 5.43 % water

D
95.57% ethyl alcohol + 4.43% water

Solution

Rectified spirit, also known as neutral spirits, rectified alcohol, or ethyl alcohol.
95.5% ethanol with 4.5% water mixture called Rectified Spirit.
Hence, the answer is option $$D$$.
Question 5
1 / -0

The complete combustion of hydrocarbon produces

A
$$CO + H_2$$

B
$$CO + N_2$$

C
$$CO_2 + H_2O$$

D
$$CO + N_2O$$

Solution

The complete combustion of hydrocarbons produce carbon dioxide and water.

Example: $$CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$$
Question 6
1 / -0

Ethane with the molecular formula $$ C_{2}H_{6} $$ has :

A
6 covalent bonds

B
7 covalent bonds

C
8 covalent bonds

D
9 covalent bonds

Solution

The structural formula of ethane is shown in the figure.

There are 6 C-H bonds and 1 C-C bond.

So there are 7 covalent bonds.
Question 7
1 / -0

Which among the following are unsaturated hydrocarbons?

A
(i) and (iii)

B
(ii) and (iii)

C
(ii) and (iv)

D
(iii) and (iv)

Solution

These compounds show double and triple bonds. Hence they are unsaturated hydrocarbons.
Question 8
1 / -0

Identify the unsaturated compounds from the following
(i) Propane
(ii) Propene
(iii) Propyne
(iv) Chloropropane

A
(i) and (ii)

B
(ii) and (iv)

C
(iii) and (iv)

D
(ii) and (iii)

Solution

Propene has one double bond, while propyne has one triple bond. Hence, they are unsaturated compounds.
Question 9
1 / -0

Ethanol reacts with sodium and forms two products. These are

A
sodium ethanoate and hydrogen

B
sodium ethanoate and oxygen

C
sodium ethoxide and hydrogen

D
sodium ethoxide and oxygen

Solution

This reaction can be shown by following equation:

$$2Na + 2CH_3CH_2OH \rightarrow 2CH_3CH_2ONa + H_2$$

So, ethanol reacts with sodium and forms two products - sodium ethoxide and hydrogen.
Question 10
1 / -0

While cooking, if the bottom of the vessel is getting blackened on the outside, it means that:

A
the food is not cooked completely.

B
the fuel is not burning completely.

C
the fuel is wet.

D
the fuel is burning completely.

Solution

Sooty deposit is a sign of incomplete combustion. If sufficient amount of oxygen is not provided, the fuel will not burn completely. Thus leaving behind a black sooty deposit on the vessel.

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Carbon and its Compounds Test - 37

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Carbon and its Compounds Test - 37

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Question 1

Sodium salt

Calcium salt

magnesium salt

potassium salt

Solution

Question 2

Carbon can form covalent bonds.

Chlorine atoms react to gain a noble gas electronic configuration.

Covalent bonding involves losing and gaining electrons.

Hydrogen molecules have the formula $$H_{2}$$.

Solution

Question 3

Single covalent bond

Double covalent bond

Dative bond

Triple bond

Solution

Question 4

95% ethyl alcohol + 5% water

94% ethyl alcohol + 4.53% water

94.4% ethyl alcohol + 5.43 % water

95.57% ethyl alcohol + 4.43% water

Solution

Question 5

$$CO + H_2$$

$$CO + N_2$$

$$CO_2 + H_2O$$

$$CO + N_2O$$

Solution

Question 6

6 covalent bonds

7 covalent bonds

8 covalent bonds

9 covalent bonds

Solution

Question 7

(i) and (iii)

(ii) and (iii)

(ii) and (iv)

(iii) and (iv)

Solution

Question 8

(i) and (ii)

(ii) and (iv)

(iii) and (iv)

(ii) and (iii)

Solution

Question 9

sodium ethanoate and hydrogen

sodium ethanoate and oxygen

sodium ethoxide and hydrogen

sodium ethoxide and oxygen

Solution

Question 10

the food is not cooked completely.

the fuel is not burning completely.

the fuel is wet.

the fuel is burning completely.

Solution

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