MEDIUM
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What happens when calcium reacts with water?

Important Questions on Sorting Materials into Groups

EASY
Which of the following metal in combination with oxygen would yield basic metal oxide?
MEDIUM

Write a chemical equation for the reaction taking place in the test tube. How does the colour of the solution change? What is the change in colour of iron nails? 

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EASY
What is the gas liberated when the metals react with dilute acids?
EASY
Read the following statements.
Statement I: Sodium metal reacts violently with water to produce heat and fire.
Statement II: Potassium metal reacts violently with water to form potassium hydroxide and hydrogen gas.
 Select the correct answer from the option given below
MEDIUM
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be-
EASY
Zn(s) + CuSO4(aq)   ZnSO4(aq) + Cu(s). What type of chemical reaction is shown in the above equation?
EASY
What happens when steam is passed over red-hot iron. Write only chemical equation.
EASY
Aluminium carbide is treated with water, we get
EASY
Why should we not throw small pieces of sodium into a laboratory sink?
MEDIUM
Which metal produces dihydrogen (H2) gas by reaction with cold water?
HARD
Explain the reaction of following with water.
(a) potassium
(b) sodium
(c) calcium
HARD
What happens when calcium reacts with water? Write the chemical equation of the reaction of calcium with water.
EASY
Compare the chemical properties of metals and non- metals with respect to reaction of water and dilute acids.
HARD
Name the reactions of three metals which react with steam.
HARD
Describe the reaction of potassium with water. Write the equation of the reaction involved.
HARD
The metal M reacts vigorously with water to form a solution S and a gas G. The solution S turns red litmus to blue whereas gas G, which is lighter than air, burns with a pop sound. Metal M has a low melting point and it is used as a coolant in nuclear reactors.
(a) What is metal M?
(b) What is solution S? Is it acidic or alkaline?
(c) What is gas G?
(d) Write a balanced chemical equation for the reaction which takes place when metal M reacts with water.
(e) Is this reaction exothermic or endothermic?
EASY
Explain the reaction of potassium with water.
HARD
Compare the chemical properties of metals and non-metals with respect to reaction of water and dilute acids.