Advertisements
Advertisements
Question
State the various characteristics of chemical reactions.
Solution
Following are the various characteristics of a chemical reaction:
- Evolution of gas: Zinc and dilute sulphuric acid react to form zinc sulphate with the evolution of hydrogen gas.
- Formation of precipitate: Sulphuric acid and barium chloride react to form white precipitates of barium sulphate.
- Change in colour: Purple colour of potassium permanganate solution on addition of citric acid changes to colourless solution.
- Change in temperature: Barium hydroxide and ammonium chloride react to form barium chloride, ammonia and water. This is an endothermic reaction in which heat is absorbed, causing the temperature to fall.
- Change in state: Combustion of candle wax (solid) leads to the formation of water (liquid) and carbon dioxide (gas).
APPEARS IN
RELATED QUESTIONS
Write balanced chemical equation with state symbols for the following reaction:
Sodium hydroxide solution reacts with hydrochloric acid solution to produce sodium chloride solution and water.
Write word equation for the following skeletal equation:
\[\ce{FeCl2 + Cl2 -> FeCl3}\]
Balance the following equation. Also name the product formed.
`"NaNO"_3 → "NaNO"_2 + "O"_2` Name of product (s)
To determine the percentage of water absorbed by raisins, raisins are soaked in water for:
Balance the following equation:
Zn + HNO3 `→` Zn(NO3)2 + H2O + NO2
Define: Endothermic reaction
Write word equation for the following molecular equation:
AgN03 + HCI → HNO3 + AgCl ↓
Word equation:
State whether AgCl is soluble or insoluble in HN03.
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Pressure
Write a balanced equation for the following word equation:
Lead dioxide [lead (IV) oxide] → Lead monoxide + Oxygen
Balance the following chemical equation.
- Na + O2 → Na2O3
- Ca + N2 → Ca3N2
- N2 + H2 →NH3
- CaCO3 +HCl → CaCl2 + CO2 +H2O
- Pb(NO3)2 → PbO + NO2 + O2
