The first metal used by a man was 1). Copper 2). Silver 3). Bronze 4). Brass
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1. Now-a-days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps ?
2. A metal is exposed to the atmosphere for sometime It becomes coated with green carbonate. The metal must be
3. Question 8.13:How is the variability in oxidation states of transition metals different fromthat of the non-transition metals? Illustrate with examples.
4. Question 14.3:Write two main functions of carbohydrates in plants.
5. Silver halides are used in photographic plates because they are
6. If the sewage is fully oxidized, the nitrogen is in the form of
7. Question 2.65:The unpaired electrons in Al and Si are present in 3p orbital. Which electrons will experience more effective nuclear charge from the nucleus?
8. Copper is refined by
9. Question 3.14:What is the significance of the terms – ‘isolated gaseous atom’ and ‘ground state’ while defining the ionization enthalpy and electron gain enthalpy?Hint: Requirements for comparison purposes.
10. The constituents of automobile exhaust that can cause cancer is are :
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