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प्रश्न
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
विकल्प
Right
Wrong
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उत्तर
In the electrolytic method, a layer of highly active metal is applied to a less active metal- Wrong
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संबंधित प्रश्न
Which of the following pairs will give displacement reactions?
Name the most abundant metal in the earth’s crust.
Name the metal which is extracted from the ore called ‘rock salt’.
Which of the following is an iron ore?
Give the principles of the hydrolytic method.
Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
Explain the following:
Galvanization protects iron from rusting.
The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.
How many valence electrons are present in metals ?
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Answer the following question :
What is the difference between calcination and roasting.
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 ______.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
Aluminium oxide is _______ oxide.
Write the name.
The process of strong heating of carbonate ores in insufficient air–
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
Explain concept with example/explain with the help of a balanced equation.
Calcination
Read the following passage and answer the questions.
According to the reactivity series, zinc is more reactive than iron, iron is more reactive than silver. During study of this, a student dipped the iron nails in silver nitrate solution.
- What is reactivity series?
- What will happen when iron nails are dipped in silver nitrate solution?
- Which type of reaction happens when iron metal reacts with silver nitrate solution?
- What will happen if a zinc rod is used instead of iron nail?
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
Which of the following ore is concentrated by the Froth floatation process?
