Advertisements
Advertisements
प्रश्न
Burning of paper is a ______ change.
विकल्प
physical
chemical
physical and chemical
neutral
Advertisements
उत्तर
Burning of paper is a chemical change.
APPEARS IN
संबंधित प्रश्न
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
Write true or false :
Hydrogen sulphide has rotten egg smell .
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Potassium fluoride
Choose the correct option from the bracket and explain the statement giving a reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of ______ reaction.
Give one example electrochemical reaction.
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 – Thermal decomposition of mercury [II] oxide.
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
______ is not a chemical change.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
