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प्रश्न
Explain the following reaction with one suitable example of Combination reactions .
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उत्तर
Combination reactions : In this reaction two or more substances combine to form a new substance, e.g. Burning of hydrogen in air.
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संबंधित प्रश्न
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A), then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
Fill in the blank
A new substance is always formed in a _______ change.
Write true or false :
Hydrogen sulphide has rotten egg smell .
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.
Complete the statement by filling the gap using an appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
An ______ is drawn in between the reactants and products while writing the equation for a chemical reaction.
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
The conversion of ferrous sulphate to ferric sulphate is ______ reaction.
What is a chemical reaction?
Name the gases which turn moist red litmus blue.
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
______ gas causes tears in our eyes while cutting onions.
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
Beating an egg to make a cake is a ______.
Iron and rust are the same substances.
Chemical changes are important in our day-to-day life. Give examples.
Write a note on the following:
Fermentation
