NCERT Class 10 Science — Chapter 2: Acids, Bases and Salts

Assertion (A): Non-metallic oxides are generally acidic in nature. Reason (R): Non-metals are electronegative elements that form covalent bonds with oxygen.

Bleaching powder is produced by the action of chlorine gas on which of the following substances?

What is the chemical formula of baking soda?

What is observed when water is added to anhydrous copper sulphate powder?

Which acid is primarily present in an ant sting?

What is the common name for the compound Na2CO3·10H2O?

What are the standard products of a neutralisation reaction between an acid and a base?

What is the general chemical nature of metallic oxides?

Which salt is formed when zinc reacts with sodium hydroxide?

What are the products formed when an acid reacts with a metal carbonate or metal hydrogencarbonate?

Which of the following inferences about pH is/are correct? 1. A solution with a pH of 7 is considered strongly acidic. 2. As pH increases above 7, the basic strength of the solution increases. 3. A lower pH value corresponds to a higher hydronium ion concentration. Select the correct answer using the code given below.

Assertion (A): Acid rain can threaten aquatic life in rivers and lakes. Reason (R): Acid rain lowers the pH of river water below the survival range for many aquatic organisms.

Match List-I with List-II and select the correct answer using the code given below: List-I (Source/Substance) | List-II (Nature/Constituent) A. Ant sting | 1. Methanoic acid B. Bee-sting | 2. Acid causing pain and irritation C. Nettle sting | 3. Stinging hair injecting methanoic acid D. Baking soda | 4. Mild base used as a remedy

Which of the following substances acts as an olfactory indicator?

The thick clouds in the atmosphere of Venus are primarily composed of:

Which gas is primarily produced when sodium hydrogencarbonate is heated during cooking, causing dough to rise?

Litmus, a common acid-base indicator, is extracted from which organism?

Which chemical formula represents Plaster of Paris?

With reference to the reaction of metals with dilute acids, consider the following statements: 1. Hydrogen gas is liberated. 2. The metal remains chemically unchanged. 3. The reaction is an example of neutralisation. 4. The gas evolved burns with a pop sound. Which of the statements given above are correct?

Which of the following chemical formulae represents gypsum?

Consider the following statements regarding the electrical conductivity of solutions: 1. Glucose and alcohol solutions do not conduct electricity. 2. Acidic solutions conduct electricity due to the presence of ions. 3. All covalent compounds conduct electricity when dissolved in water. 4. Pure water is a strong conductor of electricity. Which of the statements given above are correct?

Consider the following statements regarding pH in biological and environmental contexts: 1. The human body functions within a narrow pH range of 7.0 to 7.8. 2. Rainwater is termed acid rain only when its pH is exactly 7.0. Which of the statements given above is/are correct?

The process of mixing concentrated acids or bases with water is characterised by which thermodynamic feature?

In the term ‘pH’, what does the letter ‘p’ stand for, derived from the German word ‘Potenz’?

Which ion is primarily responsible for the acidic properties of a solution?

Under which condition does dry hydrogen chloride gas turn blue litmus paper red?