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प्रश्न
From the metals copper, iron, magnesium, sodium and zinc, select a different metal in each case which:
(a) Does not react with dilute hydrochloric acid
(b) Can form 2+ and 3+ ions
(c) Has a hydroxide that reacts with both acid and alkalis.
(d) Does not react with cold water, but reacts with steam when heated.
उत्तर
(a) Copper
(b) Iron
(c) Zinc
(d) Magnesium
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संबंधित प्रश्न
Choose the correct answer from the options given below:
The main ore used for the extraction of iron is
A. Haematite
B. Calamine
C. Bauxite
D. Cryolite
Explain and give reasons why aluminium vessels should not be cleaned with powders containing alkalis ?
Identify the pairs of metals and their ores from the following.
| Group A | Group B |
| a. Bauxite | i. Mercury |
| b. Cassiterite | ii. Aluminium |
| c. Cinnabar | iii. Tin |
Complete the statement using every given option.
During the extraction of aluminium.........
Heating the aluminium ore with concentrated caustic soda.
Define the term : Mineral
Comment on the statement that- "All ores are minerals but all minerals are not ores".
Write the name and formula of two ores of the following: Aluminium
Give composition and uses of the following alloys. Mention the reason for its use.
Solder
Name the following :
An alloy of lead and tin that is use in electrical circuits.
What is the role of flux in metallurgical processes?
