Exploring Substances Acidic Basic and Neutral Class 7 Fill in the Blanks
hardExploring Substances Acidic Basic and Neutral Class 7 Fill in the Blanks
Exploring Substances Acidic Basic and Neutral Class 7 Fill in the Blanks
Question 1.
Litmus paper is used to test the nature of substances. It turns blue in ............ solutions.
Answer:
basic
Question 2.
Substances that taste sour are generally............ in nature.
Answer:
acidic
Question 3.
The solution formed when an acid reacts with a base is called .............
Answer:
neutral
Question 4.
Turmeric paper turns red in ............ solutions.
Answer:
basic
Question 5.
A solution that does not change the colour of litmus paper is called .............
Answer:
neutral.
Exploring Substances Acidic Basic and Neutral Class 7 True or False
Question 1.
Baking soda is an acidic substance.
Answer:
False
Question 2.
All substances are acid.
Answer:
False
Question 3.
Neutral solutions do not change the colour of litmus paper.
Answer:
True
Question 4.
Turmeric can be used to test for acidic substances.
Answer:
False
Question 5.
Amla juice is basic in nature.
Answer:
False
Exploring Substances Acidic Basic and Neutral Class 7 Match the Following
Question 1.
Match the following acids with their sources.
| Column A | Column B |
| A. Lemon juice | 1. Acetic acid |
| B. Vinegar | 2. Citric acid |
| C. Tamarind | 3. Tartaric acid |
| D. Curd | 4. Lactic acid |
Answer:
| Column A | Column B |
| A. Lemon juice | 2. Citric acid |
| B. Vinegar | 1. Acetic acid |
| C. Tamarind | 3. Tartaric acid |
| D. Curd | 4. Lactic acid |
Question 2.
Match the following substances with their nature:
| Column A | Column B |
| A. Lemon juice | 1. Basic |
| B. Soap solution | 2. Acidic |
| C. Vinegar | 3. Neutral |
| D. Tap water | 4. Acidic |
Answer:
| Column A | Column B |
| A. Lemon juice | 2. Acidic |
| B. Soap solution | 1. Basic |
| C. Vinegar | 4. Acidic |
| D. Tap water | 3. Neutral |
Question 3.
Match the following indicators with their sources:
| Column A | Column B |
| A. Litmus | 1. Turmeric |
| B. Red rose extract | 2. Lichens |
| C. Turmeric | 3. Rose petals |
| D. Turmeric paper | 4. Spice |
Answer:
| Column A | Column B |
| A. Litmus | 2. Lichens |
| B. Red rose extract | 3. Rose petals |
| C. Turmeric | 4. Spice |
| D. Turmeric paper | 1. Turmeric |