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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
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.
Name three biochemical catalysts found in the human body.
Give a reason.
Wasp sting is treated with vinegar.
How is precipitate formation in a chemical reaction indicated?
Is kerosene an electrolyte or a non-electrolyte ?
What do you observe when :
an iron nail is kept in tap water for few days
Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
Define an electrochemical reaction.
Give an example of the following chemical change.
Two gases combine to form white solid
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
Name: A brown gas
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
Complete the statement by filling in the blank with the correct word:
The reddish-brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and alkali is __________.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
Circle the odd one out. Give reason for your choice
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
A chemical change may involve –
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think formation of rust from iron is a chemical change?
______ is the chemical name of slaked lime.
