Advertisements
Advertisements
प्रश्न
The elements whose oxides can turn litmus solution blue are ______.
पर्याय
carbon and sulphur
sodium and carbon
potassium and magnesium
magnesium and sulphur
Advertisements
उत्तर
The elements whose oxides can turn litmus solution blue are potassium and magnesium.
Explanation:
Litmus solution turns blue in the presence of a base. Metals like potassium and magnesium react with oxygen to form metallic oxides (K2O and MgO), which are inherently basic and dissolve in water to yield alkaline solutions. Conversely, non-metals like carbon and sulphur produce acidic oxides (CO2 and SO2) that would instead turn litmus paper red.
APPEARS IN
संबंधित प्रश्न
‘E’ is an element which reacts with oxygen to form an oxide E2O. An aqueous solution of E2O turns red litmus blue, so:
i. What is the nature of oxide E2O ?
ii. Write the name of element ‘E’.
Why is sodium kept immersed in kerosene oil?
A copper coin is kept immersed in a solution of silver nitrate for some time. What will happen to the coin and the colour of the solution?
Write an equation for the reaction of:
Magnesium with oxygen
Complete and balance the following equation:
\[\ce{Na + O2 ->}\]
Ordinary aluminium strips are not attacked by water because of the presence of a layer of ______ on the surface of aluminium.
Which of the following elements would yield an acidic oxide?
Na, S, C, K, H
Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.
Describe the reaction of potassium with water. Write the equation of the reaction involved.
Give one example, with equation, of the displacement of hydrogen by a metal from an acid.
What happens when calcium reacts with water? Write the chemical equation of the reaction of calcium with water.
Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions?
State and explain the reaction, if any, of the following metals with a solution of copper sulphate:
(a) Gold
(b) Copper
(c) Zinc
(d) Mercury
What are noble gases
What is the characteristic of the electronic configuration of noble gases?
Write the chemical equation of the above process.
Write the chemical equation for the following reaction:
Calcium metal reacts with water.
Write the chemical equation for the following reaction:
Manganese dioxide is heated with aluminum powder.
Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
Tungsten wire is used in electric bulbs.
