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प्रश्न
Write the chemical reaction where the following changes are observed.
Gas is evolved
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उत्तर
\[\ce{Zn + H2SO4 -> ZnSO4 + H2}\]
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संबंधित प्रश्न
Complete and balance the following chemical equations
Na + H2 O →
Complete and balance the following chemical equations:
Zn + `"H"_2"SO"_4` `→`
(dil)
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
A chemical equation is a statement that describes a chemical change in terms of
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
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:
Copper nitrate to nitrogen dioxide
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
________ is a chemical substance which alters the speed of a chemical reaction.
What is the use of indicator?
