Advertisements
Advertisements
Question
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Solution
Ammonium dichromate is a bright orange-red crystalline solid. It is readily ignited and burns to produce a voluminous green residue.
APPEARS IN
RELATED QUESTIONS
Complete and balance the following chemical equations:
N2 + O2 →
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Explain the following reaction with one suitable example of Combination reactions .
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
Give an example of the following chemical change.
A reaction where colour change is noticed
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
Give a chemical test to distinguish between the following gases.
NH3 and SO2
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
Select the correct answer for the following options:
The black residue obtained on heating copper carbonate.
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
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 acid to an active metal.
Give a suitable example with an equation to show the representation of a chemical reaction.
Circle the odd one out. Give reason for your choice
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
Iron and rust are the same substances.
Write the equation for the process of formation of rust.
Write a note on the following:
Fermentation
Photosynthesis is a chemical charge. Justify your answer.
