Advertisements
Advertisements
प्रश्न
Which among the following statements is incorrect for magnesium metal?
पर्याय
It burns in oxygen with a dazzling white flame
It reacts with cold water to form magnesium oxide and evolves hydrogen gas
It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas
It reacts with steam to form magnesium hydroxide and evolves hydrogen gas
उत्तर
It reacts with cold water to form magnesium oxide and evolves hydrogen gas
Explanation -
Magnesium does not react with cold water. It only reacts with hot water or steam to form magnesium hydroxide and hydrogen gas.
APPEARS IN
संबंधित प्रश्न
What do you observe when dilute sulphuric acid is added to granulated zinc?
What do you observe when silver nitrate is added to a solution of sodium chloride?
How will you obtain Magnesium oxide from magnesium.
Also give balanced equations for the reactions
With reference to Acid explain with a suitable example of how the reactivity of the metals could be differentiated.
Give a balanced equation for the reversible catalytic reaction involving nitrogen as one of the reactants.
Explain the following reaction with the balanced equation.
Reaction of aluminium with oxygen
Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores.
Explain the following
- Reactivity of Al decreases if it is dipped in HNO3
- Carbon cannot reduce the oxides of Na or Mg
- NaCl is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state
- Iron articles are galvanised.
- Metals like Na, K, Ca and Mg are never found in their free state in nature.
Of the three metals X, Y and Z. X reacts with cold water, Y with hot water and Z with steam only. Identify X, Y and Z and also arrange them in order of increasing reactivity.
Metal ‘A’ has electronic configuration 2, 8, 1 and metal ‘B’ has electronic configuration 2, 8, 8, 2. Out of these, which metal is more reactive? Write the reaction of this metal with dilute HCl acid.
