Acids Bases and Salts Test

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Acids Bases and Salts Test - 35

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Weekly Quiz Competition

Question 1
1 / -0

What is/are formed when acids react with carbonates?

A
Salt

B
Water

C
Carbon dioxide

D
All of above

Solution

When acids react with carbonates, such as calcium carbonate (found in chalk, limestone, and marble), salt, water, and carbon dioxide are formed.
In general:
$Acid + Metal\ carbonate \rightarrow Salt + Water + Carbon\ dioxide$
Example:
$2HCl + CaCO_3 \rightarrow CaCl_2 + H_2O + CO_2$
Question 2
1 / -0

Salts of strong acid and strong base are neutral, generally with a $pH$ value of:

A
$6$

B
$7$

C
$8$

D
$9$

Solution

Salts of strong acid and strong base are neutral with a $pH$ value of $7$ .
For example, Hydrochloric acid is a strong acid that reacts with sodium hydroxide which is a strong base to give sodium chloride whose $pH$ value is 7.
Question 3
1 / -0

The reaction between copper oxide and nitric acid forms:

A
copper nitrate and hydrogen

B
copper nitrite and water

C
copper nitrite and hydrogen

D
copper nitrate and water

Solution

$CuO + 2HNO_3 \rightarrow Cu(NO_3)_2 + H_2O$
Copper oxide and nitric acid react to give copper nitrate and water.
Question 4
1 / -0

Why does baking soda and vinegar react with each other?

A
To neutralize each other

B
To decompose each other

C
To displace each other

D
None of the above

Solution

Baking soda is basic and, vinegar is acidic in nature. Baking soda and vinegar undergo a neutralization reaction and form carbon dioxide, water, and sodium acetate.
$NaHCO_3\;+\;CH_3COOH\;\rightarrow\;CH_3COONa\;+\;H_2O\;+\;CO_2$
In this reaction, no decomposition or displacement is taking place. Hence the correct option is A.
Question 5
1 / -0

When a base combine with metal it forms metal salt/base and releases:

A
oxygen

B
hydrogen

C
carbon dioxide

D
nitrogen

Solution

Metals mostly do not react with bases. However, there some metals that will react with strong bases like $NaOH$ and produce metal salt/base and release hydrogen gas. The presence of hydrogen gas can be examined by the pop sound.

Zinc reacts with dilute $NaOH$ as follows:

$Zn$ + $2NaOH\rightarrow$ $H_2$ + $Na_2ZnO_2$

Option B is correct.
Question 6
1 / -0

Olfactory indicators are used to ______________.

A
detect acid and base

B
ensure the participation of visually impaired students

C
both A and B

D
determine the strength of acid and base

Solution

Substances that change their smell when mixed with acid or base are known as olfactory indicators.
For example, onion, vanilla, clove, etc.
Olfactory indicators are used to ensure the participation of visually impaired students in the laboratory.
Hence, the correct option is $\text{C}$ .
Question 7
1 / -0

Tooth decay can be cured by a toothpaste by a reaction called as :

A
Redox reaction

B
Condensation

C
Neutralization

D
None of above

Solution

When food particles decay in our teeth, the level of acidity in our mouth rises. This leads to tooth decay. Toothpaste are basic in nature. So, this neutralizes the acids and helps prevent tooth decay.
Question 8
1 / -0

What is used with acid in fire extinguishers to produce carbon dioxide gas?

A
Metal oxide

B
Metal hydrogen carbonate

C
Metallic acid

D
None of these

Solution

Metal carbonate or metal hydrogen carbonate and acid are used in fire extinguisher to produce carbon dioxide gas. Acid and metal carbonate or bicarbonate are kept in separate chambers in a fire extinguisher. In case of an emergency, they are allowed to react with one another. The following reaction takes place:

$2NaHCO_3+H_2SO_4→Na_2SO_4+2H_2O+2CO_2$

The carbon dioxide gas so produced is poured over the fire. As carbon dioxide does not support burning, it puts off the fire.
Question 9
1 / -0

Smell of clove cannot be characterized in:

A
acidic medium

B
basic medium

C
neutral medium

D
both A and B

Solution

Substances that change their smell when mixed with acid or base are known as the olfactory indicators. The smell of clove can be characterized in presence of an acid. But, it cannot be recognized in a basic medium.
Question 10
1 / -0

In acid rain, pH of rain water is:

A
7

B
9.0

C
more than 9.6

D
below 5.6

Solution

When pH of rain water drops anywhere below 5.6, it is said to be acid rain.

The main cause for acid rain is the presence of high levels of oxides of sulphur and nitrogen, which form acids with water.

Hence, the correct option is $D$ .

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Re-Attempt Weekly Quiz Competition

Acids Bases and Salts Test - 35

Result

Acids Bases and Salts Test - 35

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SHARING IS CARING

Question 1

Salt

Water

Carbon dioxide

All of above

Solution

Question 2

666

777

888

999

Solution

Question 3

copper nitrate and hydrogen

copper nitrite and water

copper nitrite and hydrogen

copper nitrate and water

Solution

Question 4

To neutralize each other

To decompose each other

To displace each other

None of the above

Solution

Question 5

oxygen

hydrogen

carbon dioxide

nitrogen

Solution

Question 6

detect acid and base

ensure the participation of visually impaired students

both A and B

determine the strength of acid and base

Solution

Question 7

Redox reaction

Condensation

Neutralization

None of above

Solution

Question 8

Metal oxide

Metal hydrogen carbonate

Metallic acid

None of these

Solution

Question 9

acidic medium

basic medium

neutral medium

both A and B

Solution

Question 10

7

9.0

more than 9.6

below 5.6

Solution

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