When blue litmus paper is added to NaOH, the colour of the litmus paper will be ……………. .
- ✓blue
- Bred
- Cpink
- Dyellow
Answer: A.
View full solution →70 questions across 12 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
MCQ
10 Q→02Write the following Statement Is True Or False. & Write True Statement.
11 Q→03Answer the following in one sentece.
10 Q→04Answer the following questions in detail.
6 Q→05Fill In The Blanks.
10 Q→06complete the Graph/Table.
1 Q→07Answer the following question.
4 Q→08Match The Columns/pair.
3 Q→09Answer the following question.
3 Q→10Find the odd one out.
7 Q→11Distinguish Between.
1 Q→12Give Scientific Reason.
4 Q→One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Answer: A.
View full solution →Answer: B.
View full solution →Answer: C.
View full solution →Answer: C.
View full solution →Answer: C.
View full solution →| Solution | Change in Indicator | Acid/Base | ||
| Litmus | Phenolphthalein | Methyl orange | ||
| 1. | ……… | No change | ……… | |
| 2. | ……… | ……… | Orange colour turns red | |
| 3. | Red litmus turns blue | ……… | ……… | |
| Column ‘A’ | Column ‘B’ |
| 1. Sodium hydroxide | a. Whitewashing |
| 2. Magnesium hydroxide | b. Fertilizers |
| 3. Calcium hydroxide | c. Washing soap |
| 4. Ammonium hydroxide | d. Antacid |
| Column ‘A’ | Column ‘B’ |
| 1. Strong acid | a. Magnesium hydroxide |
| 2. Weak alkali | b. Carbonic acid |
| 3. Weak acid | c. NaOH |
| 4. Strong alkali | d. Nitric acid |
| Group A | Group B |
| 1. Tamarind | a. Acetic acid |
| 2. Curd | b. Citric acid |
| 3. Lemon | c. Tartaric acid |
| 4. Vinegar | d. Lactic acid |
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