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प्रश्न
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
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उत्तर
Ammonium dichromate is a bright orange-red crystalline solid. It is readily ignited and burns to produce a voluminous green residue.
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संबंधित प्रश्न
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
Balancing a chemical equation is based on
When electric current is passed through acidulated water ______ of water takes place.
Explain,giving one example of the following chemical changes:
Reversible reaction
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
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 __________.
Select the correct answer from the options given below:
State the gaseous product formed, when
An active metal reacts with dilute sulphuric acid.
