Acids

Q. Hard soap is a salt whereas soft soap is a salt of fatty acids.

1. sodium
2. potassium
3. flouride
4. sulphur

Q.

Which of the following is a volatile acid and which is non-volatile?

Sulfuric acid, Sulfurous acid

Q. If the concentration of hydronium ions in a solution is ${10}^{-4}\text{M}$, then the pH of this solution is:

1. 4

Q.

Tomato juice is acidic or basic.

Q. Aqueous solution of a metal oxide changes the colour of litmus paper from _____ to ____.

1. blue, red
2. red, red
3. red, pink
4. red, blue

Q. Name an acid used: ​

(d) As an eyewash​

Q.

Classify acids on the basis of their sources and explain each of them with examples.

Q. Acids are generally bitter in taste.

1. True
2. False

Q. ${\text{CH}}_3\text{COOH(aq)}+\text{NaOH(aq)}\to {\text{CH}}_3\text{COONa(s)}+{\text{H}}_2\text{O(l)}$

The nature of the salt obtained in the above reaction is acidic.

1. True
2. False

Q. Aqua regia is a mixture of :

(i).Dilute hydrochloric acid and concentrated nitric acid (ii).Concentrated hydrochloric acid and dilute nitric acid (iii).Concentrated hydrochloric acid [1 part] and concentrated nitric acid [3 parts]
(iv)Concentrated hydrochloric acid [3 parts] and concentrated nitric acid [1 part]

Q.

Q2. A bee sting is _______ in nature and can be treated by a mild _______.
(A) Acidic; base
(B) Basic; acid

Q. what are indicators name all the types of indicators and the detailed definition like natural indicators synthetic indicators olfactory indicators and universal indicators also the formula for the pneumonic of VIBGYOR remembering the nature of acid strong, weak or mild

Q.

Define the following:

(b) Concentrated acid

Q. Explain the colour change of red cabbage extract in presence of a base.

Q. Describe an activity that prove all hydrogen containg compounds such as alcohols and glucose are not acid.

Q. Gastric juices are acidic in nature.

1. False
2. True

Q. Question 3

What happens when dilute hydrochloric acid is added to iron filings?

Q.

Choose the correct statement.

Assertion (A): We cannot taste all acids and bases.
Reason (R): Some acids and bases can be highly corrosive in nature.

1. A is incorrect, and R is correct.
2. A is correct, and R is incorrect.
3. Both A and R are correct, and R is the correct explanation for A.
4. Both A and R are correct, and R is not the correct explanation for A.

Q. What do you notice when acetic acid reacts with

(a) litmus

Q.

Acid rain is formed, when the pH of rain water is ________.

1. less than 6

2. more than 7

3. Equal to 7

4. Equal to 10

Q. Identify the items that are acidic in nature.

1. Vinegar
2. Curd
3. Soap
4. Tomato
5. Orange
6. Lemon
7. Water
8. Bee sting

Q.

Fresh milk has a pH of 6. When it changes to curd (yogurt), will its pH value increase or decrease? Why?

Q.

What has a pH of 1?

Q. Dilution of an acid with water is an ________ process.​
(A) exothermic​
(B) endothermic​

Q. Answer the following question:
(a) What happens when a dilute acid reacts with a metal oxide? Explain with the help of an example.
(b) Do metal oxides react with bases too? If yes, give an example.

Q. Soaps are ______ and ______ salts of long chain fatty acids.

1. potassium and calcium
2. sodium and calcium
3. sodium and potassium
4. calcium and magnesium

Q. The salts with the chemical formulae NaCl and NaI, contain _______ cation.

1. sodium
2. chloride
3. iodide
4. nickel

Q. The acid found in lemons is citric acid.

1. True
2. False

Q. Toothpaste is generally acidic in nature and neutralises the basic chemicals produced during bacterial action.

1. True
2. False

Q. Dilution of an acid with water is an ________ process.​
(A) exothermic​
(B) endothermic​