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प्रश्न
Complete and balance the following equation:
Al + KOH + H2O →
उत्तर
2Al + 2KOH + 2H2O → 2KAlO2 + 3H2
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संबंधित प्रश्न
Explain with reason:
Electrolytic reduction is done to obtain aluminium?
How does aluminum react with the Air ?
From the metals: copper, iron, magnesium, sodium, and zinc, select a different metal in the case which arranges the above metals in the decreasing order of reactivity.
Write the name and formula of two ores of the following: Aluminium
Give two properties of alloys which are different from constituent metals.
Give the name and formula of an ore of zinc.:
Roasting of the ore
What is an alloy? An alloy usually has some property which makes it useful in a specific way.
What is the special property of: Duralumin
List 1 contains the meta ls I alloys (1, 2, 3, 4, 5 ) and list 2 contains their uses (A, B, C, D, E).
| List 1 Metal/Alloy |
List 2 Uses |
| 1. Aluminium | A. Steel making |
| 2. Lead | B. aeroplane wings |
| 3. Brass | C. galvanizing |
| 4. Iron | D. radiation shield |
| 5. Zinc | E. electricaI fittings |
Copy and complete the following table, write down the correct letter against the numbers representing metals. An answer may be used only once. The first has been done for you.
| Metal | 1 | 2 | 3 | 4 | 5 |
| Use | B |
A to F below relate to the source and extraction of either zinc or aluminium.
- Bauxite
- Coke
- Cryolite
- Froth floatation
- Sodium hydroxide solution
- Zinc blende
Write down the three letters each from the above list which are relevant to:
- Zinc
- Aluminium
Nickel is purified by thermal decomposition of its:-
