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प्रश्न
Bauxite reacts with sodium hydroxide in the Bayer’s process.
विकल्प
Right
Wrong
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उत्तर
Bauxite reacts with sodium hydroxide in the Bayer’s process- Right
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संबंधित प्रश्न
Name two metals which are found in nature in the free state.
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset, but after a futile argument, the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
Name the gas in air which tarnishes silver articles slowly.
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Write the composition of the alloy called bronze.
Why do gold ornaments look new even after several years of use?
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
Name the gas evolved when cinnabar ore is roasted.
State three objectives achieved during the roasting of ores.
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.
Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Write the name.
The molecular formula of main ore of aluminium -
Explain the characteristics of ionic compounds.
Which of the following ore is concentrated by the Froth floatation process?
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
Care must be taken while diluting concentrated nitric acid with water. Why?
