Download App

STD 11 - 3. Classification of elements and periodicity in properties — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 3. Classification of elements and periodicity in properties4 Marks
MCQ
The electronic configuration of three elements $A,B$ and $C$ are given below. The molecular formula of the compound formed from $B$ and $C$ will be

$A : 1s^2\, 2s^2\, 2p^6$

$B : 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^3$

$C : 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^5$

  • A
    $BC$
  • B
    $B_2C$
  • C
    $BC_2$
  • ✓
    $BC_3$
✓

Answer

Correct option: D.
$BC_3$
d
$B$ represents phosphorus $P$ and $C$ represents Chlorine $Cl$. The compound formed is $PCl _3$ i.e., $BC _3$.

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

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Thiamine and pyridoxine are also known respectively as :
→
Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.

Assertion $A$ : Boric acid is a weak acid

Reason $R$ : Boric acid is not able to release $H ^{+}$ion on its own. It receives $OH ^{-}$ion from water and releases $H ^{+}$ion.

In the light of the above statements, choose the most appropriate answer from the options given below.

→
Consider the above reaction, the major product $'P^{\prime}$ is:-
→
The $d-$orbital involved in $s{p^3}d$ hybridisation is
→
A chemist wants to determine the molecular geometry of the $[CoCl_4]^{2-}$ ion. Which of the following gives the best suggestion for a measurement and for the interpretation of that measurement ?
→
Aluminium displaces hydrogen from dilute $HCl$ whereas silver does not. The e.m.f. of a cell prepared by combining $Al/A{l^{3 + }}$ and $Ag/A{g^ + }$ is $ 2.46\,V$  The reduction potential of silver electrode is $ + 0.80\;V$. The reduction potential of aluminium electrode is ........... $\mathrm{V}$
→
What is the decreasing order of stability (most stable $\to$ least stable) of the  following carbocations ?
→
Assertion : $PbCl_2$ is more stable than $PbCl_4$.

Reason : $PbCl_4$ is powerful oxidising agent.

→
The law of multiple proportions is illustrated by the two compounds
→
The total number of isoelectronic species from the given set is $.......$

$O ^{2-}, F ^{-}, Al , Mg ^{2+}, Na ^{+}, O ^{+}, Mg , Al ^{3+}, F$

→