Advertisements
Advertisements
प्रश्न
Give one example of a chemical reaction.
Advertisements
उत्तर
The burning of magnesium ribbon in air to give white powder of magnesium oxide is an example of a chemical reaction.
\[\ce{2Mg_{(s)} + O2_{(g)} ->[heat] 2MgO_{(s)}}\]
APPEARS IN
संबंधित प्रश्न
Complete and balance the following equation:
\[\ce{NaOH + {..........} -> Na2SO4 + H2O}\]
Write a complete balanced equation for the following reaction:
\[\ce{Calcium (solid) + Water (liquid) -> Calcium hydroxide (solution) + Hydrogen (gas)}\]
Give one example of a chemical reaction characterised by the formation of a precipitate.
Which of the following are endothermic reactions and which are exothermic reactions?
- Burning of natural gas
- Photosynthesis
- Electrolysis of water
- Respiration
- Decomposition of calcium carbonate
When a mixture of gases X and Y is compressed to 300 atm pressure and then passed over a catalyst consisting of a mixture of zinc oxide and chromium oxide (heated to a temperature of 300°C), then an organic compound Z having the molecular formula CH4O is formed. X is a highly poisonous gas which is formed in appreciable amounts when a fuel burns in a limited supply of air; Y is a gas which can be made by the action of a dilute acid on an active metal; and Z is a liquid organic compound which can react with sodium metal to produce hydrogen gas.
- What are X, Y and Z?
- Write a balanced chemical equation of the reaction which takes place when X and Y combine to form Z. Indicate the conditions under which the reaction occurs.
Write the chemical equation for the following word equation and balance them.
Nitrogen + Oxygen → Nitrogen monoxide
Balance the following equation:
KOH + Cl2 → KCl + KClO + H2O
Balance the following equation:
H2O + Cl2 → HCl + O2
Name the fundamental law that is involved in every equation.
Write the balanced chemical equation of the following reaction.
copper + nitric acid → copper nitrate + nitric oxide + water
Write the balanced chemical equation of the following reaction.
potassium dichromate + hydrochloric acid → Potassium chloride + chromium chloride + water + chlorine
(a) Give only one suitable chemical test to identify the following gases.
- Ammonia
- Sulphur dioxide
- Hydrogen Chloride
- Chlorine
- Carbon Dioxide
- Oxygen
- Hydrogen
(b) Select a basic gas mentioned in Q.1 (a). How is the basic nature suspected?
(c)Select acidic gases from the gases mentioned in Q.1 (a). How is the acidic nature suspected?
(d) State the gas responsible for bleaching action.
(e)Which gas turn blue cobalt chloride paper light pink?
Write the name and molecular formula of a carbon compound having its name suffixed with "-ol" and having two carbon atoms in its molecule. With the help of a chemical equation indicate what happens when this compound is heated with excess conc. H2SO4.
Write word equation for the following molecular equation:
Na2SO3 + 2HCl [dil.] → 2NaCl + H2O + SO2 [g]
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Electrical energy
Representation of the results of a chemical change – is a chemical equation.
For the equation: FeCl3 + 3NH4OH 3NH4Cl + Fe(OH)3 ↓
Answer the following:
What is the indications of the arrow between the reactants and the products and of the arrow pointing downwards at the end.
Explain the term ‘chemical equation’.
Balance the following simple equation:
Zn + NaOH → Na2ZnO2 + H2
The chemical equation Na2SO4(aq) + BaCl2(aq) → BaSO4(s)↓ + 2NaCl(aq) represents which of the following types of reaction?
When aqueous solutions of potassium iodide and lead nitrate are mixed an insoluble substance separates out. The chemical equation for the reaction involved is:
