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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
Name three biochemical catalysts found in the human body.
Fill in the blank.
Melting of ice is a _______ change.
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
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)
Rusting of iron is a ______ chemical change.
Give an example of a reaction where the following are involved
Catalyst
Give one example electrochemical reaction.
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
What do you observe when CO2 is passed through lime water first and then a little in excess.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
Give a word equation for the following reaction.
A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute hydrochloric acid to silver nitrate.
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
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?
Chemical change is a temporary change.
Write a note on the catalyst.
The reaction of H2 gas with oxygen gas to form water is an example of ______.
