Advertisements
Advertisements
प्रश्न
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
उत्तर
When ammonium chloride is heated White crystalline solid, on strong heating, sublimates to form a basic gas (NH3) and an acidic gas (HCl)
\[\ce{NH4Cl ⇌[Heat][Cool] NH3↑ + HCl↑}\]
APPEARS IN
संबंधित प्रश्न
How would you show that setting of curd is a chemical change?
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
Give reason.
Acidic soil is treated with quick lime.
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
Differentiate between in Chemical reaction and chemical equation.
Explain the following reaction with one suitable example of Double decomposition reaction.
A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
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.
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)
The spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.
Give an example of a reaction where the following are involved
Electricity
Name: Two carbonates do not produce carbon dioxide on heating.
Explain the term ‘chemical reaction’ with special reference to – ‘reactants’ and ‘products’.
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
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 water to quicklime.
A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
Give two examples for each of the following cases:
Chemical changes.
______ is the chemical name of rust.
