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प्रश्न
Choose the correct alternative and rewrite the following:
Iron is _____________________.
पर्याय
More reactive than Zn.
more reactive than Al.
less reactive than Cu.
less reactive than Al.
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उत्तर
less reactive than Al
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संबंधित प्रश्न
Give reasons:
Platinum, gold and silver are used to make jewellery.
Choose the correct answer from the options given below:
Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as
A. Smelting
B. Ore-dressing
C. Calcination
D. Bessemerisation
Write a chemical equation to show the process of corrosion of iron.
Name an alloy of copper. State its chemical composition and any one use.
Bronze is an alloy of ______.
Name the metal which is a constituent of plant pigment?
Explain how the activity series accounts for each of the following:
tendency to corrosion
Compare roasting and calcination.
Observe the following picture a write down the chemical reaction with the explanation.
What are the adverse effects of corrosion?
Write three methods of preventing rusting of iron.
Give a reason why rust turns moist red litmus blue.
Write the name.
An alloy of copper and tin-
Write scientific reason.
On exposure to air, silver articles turn blackish after some time.
Draw a neat labelled diagram.
Electroplating
Draw a neat labelled diagram.
Anodizing
Observe the following diagram and give answers.
- Name this method of prevention of corrosion.
- For prevention of which metal this method is used?
- What is used as anode in this method?
What is rust?
State two conditions necessary for rusting of iron.
Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of ____________.
