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Consider the following statements about acid-base indicators:
1. Litmus is a purple dye obtained from lichen.
2. Phenolphthalein is a natural indicator that turns pink in acidic solutions.
3. A turmeric (curry) stain on cloth turns reddish-brown when soap is applied to it.
Which of the statements given above is/are correct?
Match List-I (natural source) with List-II (acid present):
| List-I (Natural source) | List-II (Acid) |
|---|---|
| A. Vinegar | 1. Lactic acid |
| B. Tomato | 2. Methanoic acid |
| C. Curd | 3. Acetic acid |
| D. Nettle sting | 4. Oxalic acid |
Select the correct answer using the codes given below.
Consider the following statements about the pH scale:
1. The 'p' in pH stands for 'potenz', a German word meaning power.
2. A change of one unit on the pH scale means a tenfold change in concentration.
3. Above pH 7, the higher the pH value, the stronger the base.
Which of the statements given above is/are correct?
Consider the following pH values:
1. pH below which rainwater is called acid rain
2. Upper limit of the pH range in which the human body works
3. pH of the mouth below which tooth decay starts
4. pH of pure water
Arrange them in increasing order of value and select the correct answer using the codes given below.
Consider the following statements:
1. The human stomach produces sulphuric acid, which helps in digestion.
2. Milk of magnesia, used as an antacid, is magnesium hydroxide.
3. Tooth enamel, made of calcium hydroxyapatite, does not corrode because it is the hardest substance in the body.
Which of the statements given above is/are correct?
Match List-I (common name) with List-II (chemical formula):
| List-I (Common name) | List-II (Chemical formula) |
|---|---|
| A. Baking soda | 1. CaOCl2 |
| B. Washing soda | 2. NaHCO3 |
| C. Bleaching powder | 3. CaSO4.1/2H2O |
| D. Plaster of Paris | 4. Na2CO3.10H2O |
Select the correct answer using the codes given below.
In the chlor-alkali process, brine is electrolysed. Which set of products does this give?
Consider the following statements about useful salts:
1. Baking soda is used in antacids and in soda-acid fire extinguishers.
2. Bleaching powder is prepared from chlorine and dry slaked lime.
3. Plaster of Paris is obtained by heating limestone at 373 K.
Which of the statements given above is/are correct?
Consider the following statements about acid-base indicators:
1. Methyl orange is a synthetic indicator.
2. Onion, vanilla and clove are olfactory indicators.
3. A base turns blue litmus red.
Which of the statements given above is/are correct?
Match List-I (salt) with List-II (use):
| List-I (Salt) | List-II (Use) |
|---|---|
| A. Bleaching powder | 1. Soda-acid fire extinguisher |
| B. Washing soda | 2. Disinfecting drinking water |
| C. Plaster of Paris | 3. Removing permanent hardness of water |
| D. Baking soda | 4. Keeping fractured bones in place |
Select the correct answer using the codes given below.
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