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प्रश्न
Give reason .
A person suffering from acidity is advised to take an antacid.
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उत्तर
An antacid neutralizes stomach acidity.
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संबंधित प्रश्न
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
Balancing a chemical equation is based on
Complete the statement by filling the gaps using 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)
Oxygen is a ______ in respiration.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
Define the following term:
Precipitate
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
What do you observe when HCI is passed through a silver nitrate solution.
Select the correct answer for the following options:
The black residue obtained on heating copper carbonate.
What is a chemical reaction?
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
The water we drink is a combination of hydrogen and oxygen.
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
A chemical change may involve –
Iron and rust are the same substances.
We are advised to not to play with fireworks. Give reason.
