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प्रश्न
The material which is added to water during purification process at the water works so as to disinfect it is :
विकल्प
potassium permanganate
betadine
chlorine
potash alum
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उत्तर
chlorine
Chlorine is added to water to purify it from the impurities such as bacteria.
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संबंधित प्रश्न
The inter-molecular space is maximum in
Fill in the blank :
The state of matter with definite volume and definite shape is called______
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
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Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
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- State one characteristic property of gas D.
- Write one test to identify gas E.
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| Temperature | : | 10°C | 20°C | 40°C | 60°C | 80°C |
| Solubility | : | 24 g | 37 g | 41 g | 55 g | 66 g |
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Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
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Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
Fill in the following blanks with suitable words :
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The boiling point of liquid argon is :
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| S.No. | CELSIUS | KELVIN |
| 1. | 90°C | 363 K |
| 2. | ______ | 283 K |
| 3. | 63 °C | ______ |
| 4. | 250°C | ______ |
| 5. | ______ | 303 K |
Write scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
