Acids, Bases and Salts (Class VII)
| Description: Acid Base and Salts | |
| Number of Questions: 15 | |
| Created by: Vijay Palan | |
| Tags: Acid Base and Salts Indicators Neutralisation Heating Effect of Current and Calculation of Power Identification of Acids and Bases Acids, Bases and Salts Properties of Acids and Bases Uses of Acids and Bases |
The sharp pain caused by the sting of brown ants, nettles and bees is due to
Which of the following is a mineral acid?
Which of the following acids helps in the growth, development and repair of the body cells?
Which of the following bases changes the colour of turmeric stain from yellow to brownish red?
In a solution, if used as an indicator, the colour of china rose petals changes to green. Which of the following is the solution?
Match the following:
| a. Acid | 1. It is a substance that has a soapy touch, bitter taste and turns red litmus blue. |
| b. Base | 2. It is a complex naturally-occurring substance that changes its colour on coming in contact with other substances. |
| c. Indicator | 3. It is a substance that has a sour taste and turns blue litmus red. |
Which of the following is not a property of acids?
When a few drops of colourless phenolphthalein solution were added to a solution, the colour of the indicator changed to deep pink. Which of the following is the solution?
Which of the following statements is/are false?
a. The solution of litmus in distilled water is mauve in colour. b. Distilled water and alcohol solution are a few examples of neutral substances. c. A solution of common salt that has no effect on red litmus paper is basic in nature.
To relieve indigestion, doctors prescribe antacid tablets. Among other things, they contain
Match the following: Name|Chemical formula|Found in| |a. Sodium hydroxide|1. Mg(OH)2|p. Limewater| |b. Calcium hydroxide|2. NaOH|q. Milk of magnesia| |c. Magnesium hydroxide|3. Ca(OH)2|r. Soap|
Which of the following is not an indicator?
Match the following: Substances|Taste| |a. Tamarind|1. Sour| |b. Baking soda solution|2. Sweet| |c. Sugar solution|3. Bitter|
Which of the following indicators identify only the basic solutions, whereas their colour does not change in acidic and neutral solutions?
a. Turmeric b. Phenolphthalein c. Litmus solution d. China rose petals
Match the following: Acid|Source| |a. Tartartic acid|1. Proteins| |b. Lactic acid|2. Grapes and goose berries| |c. Amino acid|3. Sour milk|