Acid, Bases and Salts

Question 1

Acid present in vinegar

Answer 1

Acetic Acid

Question 2

Acid present in Orange and Lemon

Answer 2

Citric Acid

Question 3

Acid present in Tamarind

Answer 3

Tartaric Acid

Question 4

Acid present in Tomato

Answer 4

Oxalic Acid

Question 5

Acid present in curd

Answer 5

Lactic Acid

Question 6

Acid present in Insect Sting

Answer 6

Methanoic Acid

Question 7

Definition Of Acid

Answer 7

Acids are those chemical substances which have a sour taste and change the colour of blue litmus to red.

Question 8

Metal + Dilute Acid —> ?

Answer 8

Salt + Hydrogen Gas

Question 9

Metal Carbonate / Metal Hydrogen Carbonate + Acid —>

Answer 9

Salt + Carbon-di-oxide + Water

Question 10

Metal oxide + Acid —> ?

Answer 10

Salt + Water

Question 11

Definition of Base

Answer 11

Chemical substances which are bitter in taste, soapy to touch and turn red litmus to blue.

Question 12

Metal + Base —> ?

Answer 12

Salt + Hydrogen

Question 13

Base + Non-metallic oxide —> ?

Answer 13

Salt + Water

Question 14

Acid + Water —>

Answer 14

Hydromium

Question 15

Base + Water —>

Answer 15

Hydroxide

Question 16

Define Neutralization Reaction

Answer 16

Acids react with bases to produce salt and water. In this reaction, an acid neutralises the base or vice-versa, thus the reaction is known as neutralization reaction.

Question 17

Define Dilution

Answer 17

Mixing of an acid or base with water, resulting in the decrease of potency or strength of the substance is called dilution. It results in the decrease in the concentration of ions (H3O+ / OH-) per unit volume and thr acid or base is said to be diluted.

Question 18

Acid in Water or Water in Acid

Answer 18

Water in Acid

Question 19

Acid + Water, Endothermic or Exothermic

Answer 19

Exothermic

Question 20

Define alkali

Answer 20

Alkali is water soluble base.

Question 21

Metal oxide is acidic or basic in nature?

Answer 21

Basic

Question 22

Non-Metal oxide is acidic or basic in nature

Answer 22

Acidic in nature

Question 23

Define Indicators

Answer 23

Indicators are the substances that change their colour or odour when added into an acid or an alkaline solution to indicate the presence of acid or base.

Question 24

What are the different types of Indicators?

Answer 24

• Natural Indicators
• Synthetic Indicators
• Olfactory Indicators
• Universal Indicators

Question 25

Define Natural Indicators

Answer 25

These indicators are found in nature in the plants.

Question 26

Define Synthetic Indicators

Answer 26

Indicators which are synthesized in the laboratory or industry.

Question 27

Litmus turns into _____ in acid

Answer 27

Blue -> Red

Question 28

Litmus turns into _____ in acid

Answer 28

Red -> Blue

Question 29

Red cabbage turns into _____ in alkali

Answer 29

Green

Question 30

Turmeric turns into _____ in alkali.

Answer 30

Reddish-brown

Question 31

Flowers of hydrangea turns into ____ in alkali.

Answer 31

Pink

Question 32

Phenolphthalein turns is colourless in acids and neutral state. But is _____ in base.

Answer 32

Pink

Question 33

What colour methyl orange is in acids?

Answer 33

Red

Question 34

Methyl Orange turns into _____ in bases.

Answer 34

Yellow

Question 35

Define Olfactory Indicators

Answer 35

Those substances whose odour changes in acidic or basic medium are called olfactory indicators.

Question 36

Two example of olfactory indicators.

Answer 36

Onion and Vanilla essence

Question 37

Define Universal Indicators

Answer 37

To judge how strong a given acid or base is, a universal indicator is used, which is a mixture of several indicators. It shows different colours indicate different concentrations of hydrogen ion in a solution.