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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
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........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.
Name three reducing agents ?
Write true or false :
No new substance is formed during a chemical reaction.
A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.
What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.
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.
When electric current is passed through acidulated water ______ of water takes place.
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
Give a chemical test to distinguish between the following gases.
NH3 and SO2
What do you observe when dilute sulphuric acid is added to the following:
Sodium Sulphide
What do you observe when CO2 is passed through lime water first and then a little in excess.
What is a chemical reaction?
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
Write word equations for two chemical reactions with the help of materials given in the box.
| Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water |
Is the conversion of milk into ice cream a chemical change?
Write the equation for the process of formation of rust.
We are advised to not to play with fireworks. Give reason.
Photosynthesis is a chemical charge. Justify your answer.
What are the chemical reactions that occur in everyday life?
