Download App

The s-block Elements — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe s-block Elements1 Mark
MCQ
Shine at freshly cut sodium is because of :
  • ✓
    due to oscillations of free electrons.
  • B
    due to weak metallic bonding.
  • C
    due to absorption of light in crystal lattice.
  • D
    due to the presence offree valency at the surface.
✓

Answer

Correct option: A.
due to oscillations of free electrons.
Freshly cut sodium metal has a bright, shiny surface due to the oscillations of free electrons that quickly becomes a dull grey as it reacts with oxygen in the air around it. Over time, the metal becomes covered with a white crust of sodium oxide that prevents further reaction of the metal and oxygen.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from The s-block Elements→The s-block Elements — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Which of the following choice$(s)$ correctly represent$(s)$ physical properties of alkali metals?
→
The correct statements among $I$ to $III$ regarding group $13$ element oxides are,

$I$. Boron trioxide is acidic

$II$. Oxides of aluminium and gallium are amphoteric

$III$. Oxides of indium and thallium are basic

→
A homogeneous ideal gaseous reaction $AB _{2( g )} \rightleftharpoons A _{( g )}+2 B _{( g )}$ is carried out in a $25\, litre$ flask at $27^{\circ} C$. The initial amount of $AB _{2}$ was $1\, mole$ and the equilibrium pressure was $1.9 \,atm.$ The value of $K _{ P }$ is $x \times 10^{-2}$. The value of $x$ is $....\,.$ (Integer answer)
→
Which one of the following is an optically active compound
→
In the synthesis of sodium carbonate, the recovery of ammonia is done by treating $\ce{NH_4Cl}$ with $\ce{Ca(OH)_2}$. The by$-$product obtained in this process is:
→
In which of the following molecules all the bonds are not equal ?
→
Which of the following is commonly known as washing soda?
→
The chemical name of borax is
→
Which particle may be removed from a stable neutral atom with least energy change :
→
$K_p$ for the following reaction at $700\, K$ is $1.3 \times {10^{ - 3}}$ $atm$$^{-1}$. The $ K_c$ at same temperature for the reaction $2S{O_2} + {O_2} $ $\rightleftharpoons$ $ 2S{O_3}$ will be
→