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प्रश्न
Complete the table given below.
| Addition of dil. H2SO4 to FeS | Odour of gas evolved |
उत्तर
| Addition of dil. H2SO4 to FeS | Odour of gas evolved | Rotten eggs (H2S Hydrogen sulphide) |
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
catalyst .
Complete and balance the following chemical equations:
Fe `"SO"_4` + NaOH `→`
(aq.) (aq.)
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.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper carbonate.
Select the correct answer for the following options:
The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.
Give a word equation for the following reaction.
Two solids which combine on heating, to give a 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 dilute acid to an active metal.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A coloured substance which leaves on strong heating a black residue and evolves two colourless gases one of which is acidic and the other neutral.
Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
Select the correct answer from the options given below:
State the gaseous product formed, when
An active metal reacts with dilute sulphuric acid.
Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.
Analogy:
H2O: Water:: NaCl: ______.
Write some materials prepared by chemical changes.
Give an example of a chemical reaction for each of the following situations:
A change in colour is observed.
When magnesium is burnt in the air, a new substance is formed which is ______.
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
Write a note on the catalyst.
Photosynthesis is a chemical charge. Justify your answer.
What is the difference between reactants and products?
