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प्रश्न
Gold and silver are active metals.
पर्याय
Right
Wrong
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उत्तर
Gold and silver are active metals- Wrong
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संबंधित प्रश्न
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
Which of the following is an ore of mercury metal?
(a) rock salt
(b) cinnabar
(c) calamine
(d) haematite
State three objectives achieved during the roasting of ores.
Give the principles of the hydrolytic method.
Give the principles of the froth floatation process.
What is passive iron?
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
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 ______.
Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________
Name the following:
A steel grey coloured solid non-metal.
Draw a well-labelled diagram of extraction of Aluminium. Write the anode reaction in electrolytic reduction of Alumina.
In electrolytic reduction of alumina _______ is used as a cathode.
Find the odd one out and give its explanation.
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting the ore.
Reason (R): Roasting converts sulphide ores directly into metals.
