| Consider the following statements. |
| 1. Sodium tripolyphosphate is used as a laundry detergent. |
| 2. Glasses of sodium lamps are made up of oxides of silicon. |
| 3. Phosphorus is used as a dopant for n-type semiconductors. |
| 4. Safety matches contain a mixture of white phosphorus, KCIO, and binder. |
| Which of the statements given above are correct? |
A) 1, 3 and 4
B) 1 and 3
C) 2, 3 and 4
D) All of these
Correct Answer: B
Solution :
[b] Sodium tripolyphosphate is obtained from phosphoric acid and is used in laundry detergents in some countries, but banned for this use in others. Glasses of sodium lamps are made up of a special kind of glass made up of oxide of phosphorus i.e. phosphate. In trace amounts, phosphorus is used as a dopant for n-type semiconductors. Safety matches contain a mixture of phosphorus, Sulphide (P4S3), sulphur and antimony sulphide.
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