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प्रश्न
Select the correct answer for the following options:
The black residue obtained on heating copper carbonate.
पर्याय
Hydrogen
Copper [II] oxide
Oxygen
Copper [II] hydroxide
Ammonia
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उत्तर
Copper [II] oxide
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संबंधित प्रश्न
Complete and balance the following chemical equations:
Fe `"SO"_4` + NaOH `→`
(aq.) (aq.)
Write the missing reactants and products and balance the equations.
\[\ce{KClO3 ->[heat]}\] ___________+ ____________
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
TRUE \ FALSE
Ammonia is a good oxidizing agent.
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
Write the chemical reaction where the following changes are observed.
Gas is evolved
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
Give an example of a photochemical reaction.
Complete and balance the following reaction:
\[\ce{CuCO3 ->[\Delta]}\]
Complete and balance the following reaction:
\[\ce{Pb(NO3)2 ->[\Delta]}\]
Give a chemical test to distinguish between the following gases.
H2 and CO2
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 hydrochloric acid to silver nitrate.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
Burning of paper is a ______ change.
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
Write five changes in the characteristics of a substance that can take place during a chemical change.
Write a note on the catalyst.
