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Consider the following statements about calcium compounds:
1. Gypsum is calcium sulphate with two molecules of water, CaSO4.2H2O.
2. Plaster of Paris is calcium sulphate with one molecule of water for each CaSO4.
3. A suspension of slaked lime in water is called milk of lime.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Common name) | List-II (Formula) |
|---|---|
| A. Caustic soda | 1. Na2CO3.10H2O |
| B. Baking soda | 2. NaHCO3 |
| C. Washing soda | 3. Na2CO3 |
| D. Soda ash | 4. NaOH |
Select the correct answer using the codes given below.
Match List-I with List-II:
| List-I (Common name) | List-II (Formula) |
|---|---|
| A. Milk of magnesia | 1. CaOCl2 |
| B. Epsom salt | 2. D2O |
| C. Bleaching powder | 3. Mg(OH)2 |
| D. Heavy water | 4. MgSO4.7H2O |
Select the correct answer using the codes given below.
Consider the following statements about gas mixtures:
1. Water gas is also called synthesis gas because compounds such as methanol are made from it.
2. Producer gas is a mixture of carbon monoxide and hydrogen.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Ore) | List-II (Formula) |
|---|---|
| A. Cinnabar | 1. ZnS |
| B. Galena | 2. ZnCO3 |
| C. Zinc blende | 3. HgS |
| D. Calamine | 4. PbS |
Select the correct answer using the codes given below.
Consider the following statements about ores:
1. Magnetite is an ore of iron with the formula Fe3O4.
2. Copper pyrites has the formula CuFeS2.
3. Haematite has the formula Fe3O4.
Which of the statements given above is/are correct?
Quick lime is treated with water, and the product is then allowed to absorb carbon dioxide. The final substance formed is:
Consider the following statements:
1. Limestone, marble and chalk all have the same chemical composition, calcium carbonate.
2. Dry ice is used as a refrigerant.
3. Adding water to quick lime directly produces limestone.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Ore) | List-II (Metal) |
|---|---|
| A. Cinnabar | 1. Lead |
| B. Galena | 2. Mercury |
| C. Copper pyrites | 3. Iron |
| D. Haematite | 4. Copper |
Select the correct answer using the codes given below.
Consider the following statements:
1. The mixture of carbon monoxide and hydrogen is called synthesis gas because compounds such as methanol are made from it.
2. Producer gas is a mixture of carbon monoxide and hydrogen.
Which of the statements given above is/are correct?
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