Read the passage carefully and answer the following questions from (i) to (v):

The use of a universal indicator, which is a mixture of several indicators, can be helpful in judging how strong a given acid or base is. The universal indicator shows different colours at different concentrations of hydrogen ions in a solution. Here is a scale for measuring hydrogen ion concentration in a solution, called pH scale. The ‘p’ in pH stands for potenz in German, meaning power. On the pH scale, we can measure pH from 0 (very acidic) to 14 (very alkaline).

pH should be thought of simply as a number which indicates the acidic or basic nature of a solution. Higher the hydronium ion concentration, lower is the pH value.

The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution. As the pH value increases from 7 to 14, it represents an increase in $O{H}^{-}$ ion concentration in the solution, that is, increase in the strength of alkali.

When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to:

Read the passage carefully and answer the following questions from (i) to (v):

The use of a universal indicator, which is a mixture of several indicators, can be helpful in judging how strong a given acid or base is. The universal indicator shows different colours at different concentrations of hydrogen ions in a solution. Here is a scale for measuring hydrogen ion concentration in a solution, called pH scale. The ‘p’ in pH stands for potenz in German, meaning power. On the pH scale, we can measure pH from 0 (very acidic) to 14 (very alkaline).

pH should be thought of simply as a number which indicates the acidic or basic nature of a solution. Higher the hydronium ion concentration, lower is the pH value.

The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution. As the pH value increases from 7 to 14, it represents an increase in $O{H}^{-}$ ion concentration in the solution, that is, increase in the strength of alkali.

Which of the following statements is correct about an aqueous solution of an acid and of a base?

(A) Higher the pH, stronger the acid
(B) Higher the pH, weaker the acid
(C) Lower the pH, stronger the base
(D) Lower the pH, weaker the base

Read the passage carefully and answer the following questions from (i) to (v):

The use of a universal indicator, which is a mixture of several indicators, can be helpful in judging how strong a given acid or base is. The universal indicator shows different colours at different concentrations of hydrogen ions in a solution. Here is a scale for measuring hydrogen ion concentration in a solution, called pH scale. The ‘p’ in pH stands for potenz in German, meaning power. On the pH scale, we can measure pH from 0 (very acidic) to 14 (very alkaline).

pH should be thought of simply as a number which indicates the acidic or basic nature of a solution. Higher the hydronium ion concentration, lower is the pH value.

The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution. As the pH value increases from 7 to 14, it represents an increase in  ion concentration in the solution, that is, increase in the strength of alkali.

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solutions would reverse the change?

Read the passage carefully and answer the following questions from (i) to (v):

The use of a universal indicator, which is a mixture of several indicators, can be helpful in judging how strong a given acid or base is. The universal indicator shows different colours at different concentrations of hydrogen ions in a solution. Here is a scale for measuring hydrogen ion concentration in a solution, called pH scale. The ‘p’ in pH stands for potenz in German, meaning power. On the pH scale, we can measure pH from 0 (very acidic) to 14 (very alkaline).

pH should be thought of simply as a number which indicates the acidic or basic nature of a solution. Higher the hydronium ion concentration, lower is the pH value.

The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution. As the pH value increases from 7 to 14, it represents an increase in  ion concentration in the solution, that is, increase in the strength of alkali.

The pH of a solution of HCl is 4. This shows that the molarity of the solution is:

Read the passage carefully and answer the following questions from (i) to (v):

The use of a universal indicator, which is a mixture of several indicators, can be helpful in judging how strong a given acid or base is. The universal indicator shows different colours at different concentrations of hydrogen ions in a solution. Here is a scale for measuring hydrogen ion concentration in a solution, called pH scale. The ‘p’ in pH stands for potenz in German, meaning power. On the pH scale, we can measure pH from 0 (very acidic) to 14 (very alkaline).

pH should be thought of simply as a number which indicates the acidic or basic nature of a solution. Higher the hydronium ion concentration, lower is the pH value.

The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution. As the pH value increases from 7 to 14, it represents an increase in  ion concentration in the solution, that is, increase in the strength of alkali.

Two aqueous solutions P and Q have pH of 5 and 13 respectively. The correct inference is that:

Read the passage carefully and answer the following questions from (i) to (v):

Vedanshi and Krati are working in the lab. During the experiment of determining the reactivity of acids and bases, the test tube containing chemical ‘X’ cracked and the liquid inside produced blisters on the skin of Krati. The pH strip turned blue to red with the reaction to the liquid. Vedanshi immediately called her teacher for help, and first aid was provided to Krati.

What could be the possible liquid be present in test tube?

Read the passage carefully and answer the following questions from (i) to (v):

Vedanshi and Krati are working in the lab. During the experiment of determining the reactivity of acids and bases, the test tube containing chemical ‘X’ cracked and the liquid inside produced blisters on the skin of Krati. The pH strip turned blue to red with the reaction to the liquid. Vedanshi immediately called her teacher for help, and first aid was provided to Krati.

 The following list includes the possible first aid for the laboratory accidents:

1. Thoroughly rinse the affected area with water.

2. Having medicines without prescribing the doctor.

3. Consult the doctor immediately.

4. To go outside the lab, preferably in an open area.

5. Not telling the teacher and other elders or they might scold you.

Read the passage carefully and answer the following questions from (i) to (v):

Vedanshi and Krati are working in the lab. During the experiment of determining the reactivity of acids and bases, the test tube containing chemical ‘X’ cracked and the liquid inside produced blisters on the skin of Krati. The pH strip turned blue to red with the reaction to the liquid. Vedanshi immediately called her teacher for help, and first aid was provided to Krati.

The given graph below is plotted against pH and $H^{+}$ concentration.

In the experiment, Krati and Vedanshi listed the chemicals in list A and B. Which of the following is correct?

(TABELE)

Read the passage carefully and answer the following questions from (i) to (v):

Vedanshi and Krati are working in the lab. During the experiment of determining the reactivity of acids and bases, the test tube containing chemical ‘X’ cracked and the liquid inside produced blisters on the skin of Krati. The pH strip turned blue to red with the reaction to the liquid. Vedanshi immediately called her teacher for help, and first aid was provided to Krati.

Krati detected the pH of four unknown solutions A, B, C, and D as follows: 11, 5, 7, and 2 respectively, and noted down her results.

1. C is neutral in nature.

2. On reacting A and D, water is liberated.

3. A and C are basic in nature.

4. B and D react to form hydrogen gas.

Read the passage carefully and answer the following questions from (i) to (v):

Vedanshi and Krati are working in the lab. During the experiment of determining the reactivity of acids and bases, the test tube containing chemical ‘X’ cracked and the liquid inside produced blisters on the skin of Krati. The pH strip turned blue to red with the reaction to the liquid. Vedanshi immediately called her teacher for help, and first aid was provided to Krati.

What does the following activity represent?