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प्रश्न
Dil. HCl is added to Zn granules. How will you prove that chemical change has taken place here? Support your response with two arguments.
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उत्तर
Response with any of the given two arguments.
- Bubbles of gas/Evolution of gas.
- Change in colour (Zn - silvery grey to black).
- Change in temperature.
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संबंधित प्रश्न
Balance the given equation:
H2O2 
H2O + O2
State one characteristic of the chemical reaction which takes place when lemon juice is added gradually to potassium permanganate solution.
Express the following facts in the form of a balanced chemical equation:
"When a strip of copper metal is placed in a solution of silver nitrate, metallic silver is precipitated and a solution containing copper nitrate is formed".
Write word equation for the following skeletal equation:
\[\ce{CO + O2 -> CO2}\]
Write your observation and name the product when zinc reacts with dilute hydrochloric acid.
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate the volume of chlorine gas formed at S.T.P.
Identify the type of reaction taking place of the following case and write the balanced chemical equation of the reaction:
Zinc reacts with silver nitrate to produce zinc nitrate and silver.
A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – mercury [II] oxide.
Balance the following simple equation:
K + CO2 → K2O + C
A dilute ferrous sulphate solution is gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
