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प्रश्न
Mercury, silver, gold are highly reactive metals.
विकल्प
Right
Wrong
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उत्तर
Mercury, silver, gold are highly reactive metals- Wrong
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संबंधित प्रश्न
Name two metals which are highly resistant to corrosion.
Name two metals which are found in nature mainly in the free state (as metallic elements).
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
Which of the following metals can be obtained from haematite ore?
Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, it becomes hard and hence suitable for making ornaments. What are metals X and Y? Also state the colour of metal X.
Define the following term.
Mineral
Give the chemical formula of :
Bauxite
Write equations for each of the above metal which reacts with water.
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
Zinc sulphide : Roasting : : zinc carbonate : _______
Find the odd one out and give its explanation.
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Explain Bayer’s process of concentration of bauxite with a chemical equation.
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give the reason why the above reaction is known as a thermite reaction.
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Identify the substance oxidised and reduced in the above reaction.
