Advertisements
Advertisements
प्रश्न
When metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.
(a) Name any two metals which can behave like metal X.
(b) Name any two acids which can behave like acid Y.
(c) Name the gas Z.
(d) Is the gas Z lighter than or heavier than air?
(e) Is the reaction between metal X and dilute acid Y, exothermic or endothermic?
(f) By taking a specific example of metal X and dilute acid Y, write a balanced chemical equation for the reaction which takes place. Also indicate physical states of all the reactants and products.
Advertisements
उत्तर
(a) Zinc (Zn) and magnesium (Mg) metals can behave like metal X.
(b) Sulphuric acid (H2SO4) and hydrochloric acid (HCl) can behave like acid Y.
(c) Gas Z is hydrogen gas (H2).
(d) Gas Z (i.e., hydrogen) is lighter than air because it is the lightest element in the periodic table.
(e) The reaction between metal X and dilute acid Y is exothermic because it produces huge amount of heat.
(f) If X is zinc and Y is sulphuric acid, then the equation can be written as follows:
Zn (s) + H2SO4 (aq) → ZnSO4 (aq) + H2 (g)
APPEARS IN
संबंधित प्रश्न
Translate the following statement into chemical equation and then balance the equation:
Aluminium metal replaces iron from ferric oxide, Fe2O3, giving aluminium oxide and iron.
Give one example of a chemical reaction.
Correct and balance the following equation:
Ca + H2O 
CaOH + H
Balance the following equation and add state symbols:
Zn + HCI → ZnCI2 + H2
Write symbolic representation for the following word equation and balance them :
Carbon + Oxygen → Carbon dioxide.
Balance the following equation. Also name the product formed.
`"KCIO"_3 → "KCI" +"O"_2`
Balance the following equation. Also name the product formed.
`"CO" + "O"_2 → " CO"_2`
Balance the following equation:
Zn + KOH → K2ZnO2 + H2
Write the balanced chemical equation of the following reaction.
Potassium permanganate + hydrochloric acid → potassium chloride + manganese chloride + chlorine + water
Write the balanced chemical equation of the following reaction.
sulphur + nitric acid→ sulphuric acid + nitrogen dioxide + water.
Answer the following question.
What is observed when 2 mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry test tube? Write a chemical equation for the reaction involved.
In certain reaction a change of state is observed i.e. solid to liquid, liquid to gas etc. – State the change of state of the products – to give the respective reactant.
\[\ce{2H2O ->[electric][current] 2H2 + O2}\]
In certain reaction an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving addition of:
Iron [II] sulphate to sodium hydroxide.
Balance the following simple equation:
N2 + O2 ⇌ NO
Balance the following simple equation:
H2 + O2 → H2O
Balance the following simple equation:
Fe2O3 + H2 → Fe + H2O
Write a balanced equation for the following word equation:
Potassium bromide + Chlorine → Potassium chloride + Bromine
Write an Explanation.
Balanced equations
Balance the given chemical reaction as per the instructions below.
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Write the number of atoms of various elements in the reactants and products.
