Please select a subject first
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Give an equation to express the reaction between:
Steam and red hot iron
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Give an equation to express the reaction between:
Calcium and water
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A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed.
Name the gas formed in the reaction. How would you test the gas?
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A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed.
Write an equation for the reaction.
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A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed.
What do you observe when a few drops of red litmus solution are added to the turbid solution.
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Thin strips of magnesium, copper, and iron are taken.
Write down what happens when these metals are treated as follows:
- Heated in presence of air
- Heated with dil.HCl
- Added to an aqueous solution of zinc sulphate.
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Thin strips of magnesium, copper, and iron are taken.
Arrange these metals in descending order of reactivity.
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Choose the correct option:
Hydrogen is evolved by the action of cold dil. HNO3 on
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Which metal is preferred for collecting hydrogen from Cold water? Write the balanced equation.
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Which metal is preferred for collecting hydrogen from:
Write the balanced equation
Hot water
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Which metal is preferred for collecting hydrogen from steam? Write the balanced equation for the case.
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Based on the reactions of water on metals, arrange the following metals in increasing order of reactivity: iron, sodium, magnesium, zinc, calcium
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Hydrogen is obtained by displacement from:
- dilute sulphuric acid
- dilute hydrochloric acid
Write equations using zinc and iron.
Why does copper not show similar behavior?
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Give reason for the following:
Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.
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Name two alkalies that can displace hydrogen. Give balanced equations for the same. Why are the metals you have used considered to have a unique nature?
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Metal in the powdered form reacts very slowly with boiling water, but it decomposes in steam. Name the metal.
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Write a balanced equation for the reaction named metal with (i) boiling water (ii) steam.
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What do you observe when hydrogen gas is passed through a soap solution?
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When hydrogen is passed over a black solid compound A, the products are a 'colorless liquid' and a 'reddish-brown metal B'.
Substance B is divided into two parts each placed in separate test tubes.
Dilute HCl is added to one part of substance B and dilute HNO3 to the other.
- Name the substances A and B.
- Give two tests for the colourless liquid formed in the experiment.
- What happens to substance A when it reacts with hydrogen? Give reasons for your answer.
- Write an equation for the reaction between hydrogen and substance A.
- Is there any reaction between substance B and dilute hydrochloric acid? Give reasons for your answer.
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Give a reason for the following.
Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air.
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