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प्रश्न
Fill in the following blank with suitable word:
A solution made in water is known as an ........... solution and indicated by the symbol ...........
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उत्तर
A solution made in water is known as an aqueous solution and indicated by the symbol (aq).
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संबंधित प्रश्न
State whether the following statement is true or false:
A chemical equation can be balanced easily by altering the formula of a reactant or product.
Write complete balanced equation for the following reaction:
Calcium (solid) + water (liquid) 
Calcium Hydroxide (solution) + Hydrogen (gas)
Balance the gievn equation:
NaOH + H2SO4 
Na2SO4 + H2O
The chemical reaction between two substances is characterised by a change in colour from orange to green. These two substances are most likely to be:
(a) potassium dichromate solution and sulphur dioxide
(b) potassium permanganate solution and sulphur dioxide
(c) potassium permanganate solution and lemon juice
(d) potassium dichromate solution and carbon dioxide.
When water is added gradually to a white solid X, a hissing sound is heard and a lot of heat is produced forming a product Y. A suspension of Y in water is applied to the walls of a house during white washing. A clear solution of Y is also used for testing carbon dioxide gas in the laboratory.
(a) What could be solid X? Write its chemical formula.
(b) What could be product Y? Write its chemical formula.
(c) What is the common name of the solution of Y which is used for testing carbon dioxide gas?
(d) Write chemical equation of the reaction which takes place on adding water to slid X.
(e) Which characteristic of chemical reactions is illustrated by this example?
When a mixture of gases X and Y is compressed to 300 atm pressure and then passed over a catalyst consisting of a mixture of zinc oxide and chromium oxide (heated to a temperature of 300°C), then an organic compounds Z having the molecular formula CH4O is formed. X is a highly poisonous gas which is formed in appreciable amounts when a fuel burns in a limited supply of air; Y is a gas which can be made by the action of a dilute acid on an active metal; and Z is a liquid organic compound which can react with sodium metal to produce hydrogen gas.
(a) What are X, Y and Z?
(b) Write a balanced chemical equation of the reaction which takes place when X and Y combine to form Z. Indicate the conditions under which the reaction occurs.
Name the type of chemical reaction shown by the following equation:
2Mg+ O2 → 2MgO
Balance the following equation. Also name the product formed.
`"CO" + "O"_2 → " CO"_2`
In electrolysis of water, why is the volume of gas collected over one electrode double that of gas collected over the other electrode?
Explain the terms with examples.
Balanced equation
What is a chemical equation? Why it is necessary to balance it?
Balance the following equation:
C + H2SO4 → CO2 + H2O + SO2
Balance the following equation:
HNO3 + H2S → NO2 + H2O + S
Write the balanced chemical equation of the following reaction. potassium bicarbonate + sulphuric acid → potassium sulphate + carbon dioxide + water
In certain reaction an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving addition of:
Iron [III] chloride to ammonium hydroxide.
Give word equation for the following chemical reaction and give the names of the product formed.
Zn + S → ZnS
Name the following:
Two non-metal which react explosively when brought in close contact.
Balance the following simple equation:
N2 + O2 ⇌ NO
In the chemical equation the _______ are written on the left-hand side.
Which of the following is not a physical change?
