Question

Fill in the Blanks
1. Lemon juice and vinegar taste ……………… because they contain ……………… . [NCERT Exemplar]
2. Turmeric and litmus are ……………… acid-base indicators.
3. Phenolphthalein gives ……………… colour with lime water.
4. When an acidic solution is mixed with a basic solution, they ……………… each other forming ……………… and water. [NCERT Exemplar]
5. The acidic or basic nature of a substance is tested by using an ……………… .
6. The substances which show different colours in acidic, basic and neutral solutions are called ………………
7. Acid + Base → ……………… + Water
8. When an acid mixed with a base, a ……………… reaction takes place.
9. Acetic acid is present in ……………… while ……………… is present in lemon.
10. Excessive use of chemical fertilisers make the soil ……………… .
11. Hydrochloric acid + Sodium hydroxide → ……………… + Water
12. Acids turn blue litmus ……………… .

Answer 1

Answer:1 sour and bitter.

2natural 3white 5indicator 6indicator 12red

Explanation:

Answer 2

1. Lemon juice and vinegar taste SOUR because they contain ACIDS. [NCERT Exemplar]

2. Turmeric and litmus are NATURAL acid-base indicators.

3. Phenolphthalein gives NO colour with lime water.

4. When an acidic solution is mixed with a basic solution, they NEUTRALIZE each other forming SALT and water. [NCERT Exemplar]

5. The acidic or basic nature of a substance is tested by using an INDICATOR .

6. The substances which show different colours in acidic, basic and neutral solutions are called ACID - BASE INDICATORS

7. Acid + Base → SALT + Water

8. When an acid mixed with a base, a NEUTRALIZATION reaction takes place.

9. Acetic acid is present in VINEGAR while CITRIC ACID is present in lemon.

10. Excessive use of chemical fertilisers make the soil BASIC.

11. Hydrochloric acid + Sodium hydroxide → SODIUM CHLORIDE + Water

             HCl                 +     NaOH                  →         NaCl                   +   H2O

12. Acids turn blue litmus RED .

I HOPE THEY ARE CORRECT AND HELPFUL..........