Study the following table and choose the correct option: Salt Parent Acid Parent Base Nature of Salt a Sodium Chloride HCl NaOH Basic b Sodium Carbonate H 2 CO 3 NaOH Neutral c Sodium Sulphate H 2 SO 4 NaOH Acidic d Sodium Acetate CH 3 COOH NaOH Basic

The correct option is as follows: d Sodium Acetate CH 3 COOH NaOH Basic Explanation: Salt Parent Acid Parent Base Nature of Salt a Sodium Chloride HCl NaOH It is not basic, it is a neutral salt. b Sodium Carbonate H 2 CO 3 NaOH It is not neutral, it is a basic salt. c Sodium Sulphate H 2 SO 4 NaOH It is not acidic, it is a neutral salt. d Sodium Acetate CH 3 COOH NaOH Basic

Dry hydrogen chloride gas does not change the colour of dry litmus paper. Why ?

Dry hydrogen chloride gas does not change the colour of dry litmus paper because only in an aqueous solution can acids dissociate into ions. Dry hydrogen chloride does not contain any hydrogen ions, so it does not show acidic behaviour and thus does not change the colour of dry litmus paper.

While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?

While diluting an acid a lot of heat is liberated during the reaction as it is an exothermic reaction. While diluting an acid, the acid is preferred to be added to water rather than the water being added to the acid. Adding water to a concentrated acid releases a large amount of heat, which can cause an explosion and acid burns on the skin, clothing, and other body parts. So when a concentrated acid is added to water, heat is easily absorbed by a large amount of water. Hence, it is recommended that the acid should be added to water and not water to the acid.

The pH of a salt used to make tasty and crispy pakoras is 14. Identify the salt and write a chemical equation for its formation. List its two uses.

The salt commonly used to make tasty and crispy pakoras is baking soda which is chemically known as sodium hydrogen carbonate. Formation of NaHCO 3 : NaCl + H 2 O + CO 2 + NH 3 → NH 4 Cl + NaHCO 3 Two uses of Baking Soda are: It is used in the fire extinguisher. It is also used as an ingredient of antacid.

2 ml of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with a dilute solution of a strong acid?

2 ml of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. The reaction can be given as, Zn + 2 NaOH → Na 2 ZnO 2 + H 2 When a burning candle is brought towards the hydrogen gas, it burns with the pop sound and the candle will go off. Hydrogen gas will be evolved when the same metal reacts with a dilute solution of a strong acid. When Zinc metal reacts with a dilute solution of strong acid then zinc chloride and hydrogen gas will be formed. Zn ( s ) + HCl ( aq ) → ZnCl 2 ( aq ) + H 2 ( g )

HARD

10th CBSE

IMPORTANT

Earn 100

How is sodium hydroxide manufactured in industries? Name the process. In this process, a gas X is formed as a by-product. This gas reacts with lime water to give a compound Y, which is used as a bleaching agent in the chemical industry. Identify X and Y and write the chemical equation of the reaction involved.

Important Questions on Acids, Bases and Salts

MEDIUM

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>CBSE-2019>Q 6

A teacher provided acetic acid, water, lemon juice, an aqueous solution of sodium hydrogen carbonate and sodium hydroxide to students in the school laboratory to determine the pH values of these substances using pH papers. One of the students reported the pH values of the given substances as $3, 12, 4, 8$ and $14$ respectively. Which one of these values is not correct? Write its correct value stating the reason.

MEDIUM

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>CBSE-2020>Q 7

Baking soda is a mixture of:

EASY

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>CBSE-2020>Q 8

The chemical formula for plaster of Paris is:

HARD

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>CBSE-2020>Q 9

List the important products of the chlor-alkali process. Write one important use of each.

HARD

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>CBSE-2020>Q 10

How is washing soda prepared from sodium carbonate? Give its chemical equation. State the type of this salt. Name the type of hardness of water which can be removed by it?

MEDIUM

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>CBSE-2021 Term I>Q 11

Which of the options in the given table are correct?

Option	Natural Source	Acid Present
(i)	Orange	Oxalic acid
(ii)	Sour milk	Lactic milk
(iii)	Ant sting	Methanoic acid
(iv)	Tamarind	Acetic acid

MEDIUM

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>CBSE-2021 Term I>Q 12

Select from the following the statement which is true for bases.

MEDIUM

10th CBSE

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>CBSE-2021 Term I>Q 13

Study the following table and choose the correct option:

	Salt	Parent Acid	Parent Base	Nature of Salt
a	Sodium Chloride	$HCl$	$NaOH$	Basic
b	Sodium Carbonate	$H_{2} {CO}_{3}$	$NaOH$	Neutral
c	Sodium Sulphate	$H_{2} {SO}_{4}$	$NaOH$	Acidic
d	Sodium Acetate	${CH}_{3} COOH$	$NaOH$	Basic

Important Questions on Acids, Bases and Salts

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