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प्रश्न
Give a chemical test to distinguish between the following gases.
NH3 and HCl
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उत्तर
| Ammonia | Hydrogen chloride |
| Litmus test: Moist red litmus blue. | Litmus test: Moist blue litmus paper red. |
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संबंधित प्रश्न
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
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.
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.
What do you observe? When
Water is added to the quick lime.
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.
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
Mention the various conditions required for a chemical reaction to occur.
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?
______ change results in the change of the substance.
Acid rain is a result of ______.
