Advertisements
Advertisements
प्रश्न
Give one example of a chemical reaction.
Advertisements
उत्तर
Burning of magnesium ribbon in air to give white powder of magnesium oxide is an example of chemical reaction.
APPEARS IN
संबंधित प्रश्न
2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with dilute solution of a strong acid.
When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are non-metals.
Give one example of an exothermic reaction.
The chemical reaction between quicklime and water is characterised by:
(a) evolution of hydrogen gas
(b) formation of slaked lime precipitate
(c) change in temperature of mixture
(d) change in colour of the product
Write your observation for the following chemical reaction and name the product formed :
When manganese dioxide is added to potassium chlorate and heated.
Write symbolic representation for the following word equation and balance them :
Aluminium + Chlorine → Aluminium chloride.
In electrolysis of water, why is the volume of gas collected over one electrode double that of gas collected over the other electrode?
Write down what you understood from the following chemical reaction.
AgNO3(aq) + NaCI(aq) → AgCI ↓ + NaNO3(aq)
What do the following symbol stand for?
2H2
Write the chemical equation for the following word equation and balance them.
Sodium reacts with water to form sodium hydroxide and hydrogen
Balance the following equation:
S + H2SO4 → SO2 + H2O
Write the balanced chemical equation of the following reaction.
aluminium sulphate + sodium hydroxide → sodium sulphate + sodium meta aluminate + water.
Complete the following blank in the equation as indicated.
\[\ce{CaH2_{(s)} + 2H2O_{( aq)}-> Ca(OH)2_{(s)} + 2H2_{(g)}}\]
Moles: 1 mole + ______ `→` ______ + ______
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate moles of salt formed.
Match column A with column B.
| Column A | Column B |
| (a) Blue salt changes to white and then black | (i) Ammonium dichromate |
| (b) Orange coloured compound changes to green. | (ii) Iodine |
| (c) Red compound changes to brown and then yellow. | (iii) Zinc Nitrate |
| (d) White to yellow when hot and white when cold. | (iv) Copper sulphate |
| (e) Violet solid changes to violet vapours. | (v) Red Lead |
Considering the relationship in the first pair, complete the second paie :
AgCI : White :: CuI2 : ___________
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
Pb(NO3)2 + 2NH4OH → 2NH4N03 + Pb(OH)2↓
Balance the following simple equation:
KHCO3 → K2CO3 + H2O + CO2
Write a balanced equation for the following word equation:
Aluminium + Oxygen → Aluminium oxide
Write three steps of writing chemical equations with example?
