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प्रश्न
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
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उत्तर
Zinc carbonate is heated strongly in a limited supply of air to convert it to zinc oxide. This process is called calcination.
\[\ce{\underset{\text{Zinc carbonate}}{ZnCO_{3(s)}} ->[Heat] \underset{\text{Zinc oxide}}{ZnO_{(s)}} + \underset{\text{Carbon dioxide}}{CO_2↑}}\]
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संबंधित प्रश्न
Name the following:
Main ore of aluminium.
Which of the following pairs will give displacement reactions?
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
Name the most abundant metal in the earth's crust.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Which of the following is an ore of mercury metal?
(a) rock salt
(b) cinnabar
(c) calamine
(d) haematite
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Give reasons, why aluminum is used in:
In making ships
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what is thermit?
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Name the methods by which concentrated ore is converted to metallic oxide.
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Mercury, silver, gold are highly reactive metals.
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Observe the following diagram and write answers.
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- Write anode reaction and cathode reaction.
- Why fluorspar and cryolite are added in the mixture?
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?
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- What will happen if a zinc rod is used instead of iron nail?
Care must be taken while diluting concentrated nitric acid with water. Why?
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\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Identify the substance oxidised and reduced in the above reaction.
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.
