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प्रश्न
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
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उत्तर
The reaction between hydrogen sulphide and chlorine (both gases) produces sulphur (solid) and hydrogen chloride (gas).
\[\ce{\underset{Hydrogen sulphide}{H2S_{(g)}} + \underset{Chlorine}{Cl2_{(g)}}-> \underset{Hydrogen chloride}{2HCl_{(g)}} + \underset{(yellow solid)}{\underset{Sulphur}{S_{(s)}}}}\]
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संबंधित प्रश्न
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
Write the missing reactants and products and balance the equations.
................+ HCI `→` NaCI + `"H"_2"O"` + .........................
FILL IN THE BLANK
Distillation is a method of obtaining pure ............. from a solution.
Write true or false :
No new substance is formed during a chemical reaction.
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
Complete and balance the following reaction:
\[\ce{NH3 + O2 ->[\Delta]}\]
What is observed in performing the following :
| Hydrogen | Oxygen | Carbon dioxide | Chlorine | |
| Litmus test | ||||
| Apply a burning splint to the gas | ||||
| Colour of gas | colourless | colourless | colourless | greenish-yellow |
| Odour of gas |
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
Give a word equation for the following reaction.
A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
Write five changes in the characteristics of a substance that can take place during a chemical change.
