Alkali and alkaline earth metals impart colours when heated over burner. It is due to
Correct answer: D. Excitation of electrons from low energy levels to higher energy levels.
- A. Smaller electronegativity of alkali metals
- B. Smaller ionic radius of these metal
- C. De-excitation of electrons from higher energy levels to low energy level
- D. Excitation of electrons from low energy levels to higher energy levels.
Explanation
When these metals are heated, the thermal energy excites electrons from lower energy levels to higher energy levels in their atomic orbitals.As the excited electrons fall back to lower energy levels, they release energy in the form of light with specific wavelengths, causing the characteristic colors observed
Last updated
About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
Practise s-Block and p-Block Elements
1,359 free s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
2NaOH(aq) + Cl2(g) → NaCl + NaClO + H2O proceed at:
A compound 'X' on heating gives a colourless gas. The residue is dissolved in water to produce 'Y'. When CO₂ is passed through the aqueous solution of 'Y', it produces 'Z', which on gentle heating gives back 'X'. Compound 'X' is:
A elements are named as alkali metals because
A gas which burn with blue flame is:
A gas which burns with a blue flame is