MEDIUM
Earn 100

Give a reason for the following:
Sodium and potassium are stored in kerosene.

Important Questions on Water

EASY
Science>Chemistry>Water>Physical and Chemical Properties of Water
What is the gas liberated when the metals react with dilute acids?
MEDIUM
Science>Chemistry>Water>Physical and Chemical Properties of Water

Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

EASY
Science>Chemistry>Water>Physical and Chemical Properties of Water
Which of the following metal in combination with oxygen would yield basic metal oxide?
MEDIUM
Science>Chemistry>Water>Physical and Chemical Properties of Water

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
Science>Chemistry>Water>Physical and Chemical Properties of Water
Zn(s) + CuSO4(aq) →  ZnSO4(aq) + Cu(s). What type of chemical reaction is shown in the above equation?
HARD
Science>Chemistry>Water>Physical and Chemical Properties of Water
Differentiate between metals and non-metals on the basis of their chemical properties.
MEDIUM
Science>Chemistry>Water>Physical and Chemical Properties of Water
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
Science>Chemistry>Water>Physical and Chemical Properties of Water
What happens when steam is passed over red-hot iron. Write only chemical equation.
MEDIUM
Science>Chemistry>Water>Physical and Chemical Properties of Water
  Explain why, rusting of an iron objects are faster in coastal areas than in deserts?
HARD
Science>Chemistry>Water>Physical and Chemical Properties of Water
Explain why rusting of iron objects is faster in coastal areas than in deserts.
MEDIUM
Science>Chemistry>Water>Physical and Chemical Properties of Water

Give reasons-

Why copper is used to make hot water tanks and not steel (an alloy of iron)?

HARD
Science>Chemistry>Water>Physical and Chemical Properties of Water
Sodium metal reacts vigorously with water.
State whether the Solution formed by the reaction of sodium with water is acidic or basic.
MEDIUM
Science>Chemistry>Water>Physical and Chemical Properties of Water
Explain how painting of an iron gate prevents it from rusting.
MEDIUM
Science>Chemistry>Water>Physical and Chemical Properties of Water
Give reasons: Sodium, potassium and lithium are stored under oil.
MEDIUM
Science>Chemistry>Water>Physical and Chemical Properties of Water
Why are iron objects usually painted?
MEDIUM
Science>Chemistry>Water>Physical and Chemical Properties of Water
Give the chemical name of the rust.
MEDIUM
Science>Chemistry>Water>Physical and Chemical Properties of Water
Which of the following is an example of a reaction of metal with water?
EASY
Science>Chemistry>Water>Physical and Chemical Properties of Water
Which of the following is/are stored in kerosene?
MEDIUM
Science>Chemistry>Water>Physical and Chemical Properties of Water
Why does aluminium not react with water under ordinary conditions?
HARD
Science>Chemistry>Water>Physical and Chemical Properties of Water
What is the action of water on magnesium? Write equations of the chemical reactions involved.