Advertisements
Advertisements
प्रश्न
The metal M reacts vigorously with water to form a solution S and a gas G. The solution S turns red litmus to blue whereas gas G, which is lighter than air, burns with a pop sound. Metal M has a low melting point and it is used as a coolant in nuclear reactors.
(a) What is metal M?
(b) What is solution S? Is it acidic or alkaline?
(c) What is gas G?
(d) Write a balanced chemical equation for the reaction which takes place when metal M reacts with water.
(e) Is this reaction exothermic or endothermic?
उत्तर
(a) Metal M is sodium (Na), which is used as a coolant in nuclear reactors.
(b) Solution S is sodium hydroxide solution (NaOH). It is alkaline, it turns red litmus to blue.
(c) Gas G is hydrogen gas, which is lighter than air.
(d) 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g) + HEAT
(e) This reaction is exothermic because it releases excessive heat.
APPEARS IN
संबंधित प्रश्न
Giving examples, state the difference between balanced and unbalanced chemical equations.
Is Burning of natural gas an endothermic reaction or an exothermic reaction?
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.
Write your observation for the following chemical reaction and name the product formed :
When water is added to quick lime?
Write the balanced chemical equation of the following reaction. sodium hydroxide + sulphuric acid → sodium sulphate + water
Give reason for the following:
Silver salts are kept in dark coloured bottles.
Balance the following simple equation:
K + CO2 → K2O + C
What are products? Explain with the help of example.
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.
What is a chemical equation?
