Acids Bases and Salts - Worksheets
CBSE Worksheet-01
Class – VII Science (Acids, Bases and Salts)
- Which one is an organic acid?
(a) Sulphuric acid (b) Hydrochloric acid (c) Nitric acid (d) Lactic acid - Acid turns blue litmus
(a) Red (b) Orange (c) Pink (d) Green - Which of the following is a strong acid?
(a) Citric acid (b) Acetic acid (c) Malic acid (d) Sulphuric acid - Which gas is released when acid reacts with metals?
(a) Hydrogen (b) Oxygen (c) Nitrogen (d) Carbon dioxide - Match the following
Column A Column B a. Hydrochloric acid i. Natural indicator b. Carbonic acid ii. Turns red in acid c. Sodium hydroxide iii. Strong acid d. Turmeric iv. Organic acid e. Blue litmus v. Strong base - Fill in the blanks
- When acid and base react together a new compound called _______ is formed.
- All acids contain _______.
- Metal on heating or burning produce _______ of metals.
- Turmeric is a _______ indicator.
- Minerals acids are obtained from _______.
- What are indicators? Give two examples.
- What is neutralization reaction?
- What are alkalies? Give two examples.
- Classify the following as organic and mineral acids?
Hydrochloric acid, Citric acid, Malic acid, Nitric acid, Oxalic acid, Sulphuric acid.
CBSE Worksheet-01
Class – VII Science (Acids, Bases and Salts)
Answer key
- d
- a
- d
- a
- (a) – (iii), (b) – (iv), (c) – (v), (d) – (i), (e) – (ii).
- (a) Salt (b) hydrogen (c) oxide (d) natural (e) minerals.
- Indicators are substances that are used to test whether a substance is acidic or basic or neutral in nature. They change their colour when added to a solution containing an acidic or a basic substance.Indicators are of two types - natural and artificial.
Natural Indicator: Turmeric , Litmus
Artificial Indicators: Phenolphthalein - The reaction between an acid and a base two form salt and water is called neutralization reaction.
NaOH + HCl -> NaCl + H2O. - Metal oxides are basic in nature. Those bases that dissolve in water are called alkalies. Sodium hydroxide and Potassium hydroxide are two common example of alkalies.
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Organic acids Mineral acids Citric acid Hydrochloric acid Malic acid Nitric acid Oxalic acid. Hydrochloric acid