Download App

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

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 3. Classification of elements and periodicity in properties4 Marks
Question
First three ionisation energies (in $kJ/mol$) of three representative elements are  given below

Element $IE_1$ $IE_2$ $IE_3$
$P$ $495.8$ $4562$ $6910$
$Q$ $737.7$ $1451$ $7733$
$R$ $577.5$ $1817$ $2745$

Then incorrect option is

✓

Answer

c
$(c) \,R$ is $p-block$ element, because difference between $IE_2$ and $IE_3$ is  not very high as compared to between $IE_1$ and $IE_2$; hence stable  oxidation state of $R$ will be higher than $+2.$ 

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

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

Similar questions

The substance that forms the plant cell walls is or Which carbohydrates is an essential constituents of plant cells
→
Which of the following order is correct regarding boiling point ?
→
On going from right to left in a period in the periodic table the electronegativity of the elements
→
The option($s$) with correct sequence of reagents for the conversion of $P$ to $Q$ is(are)

$(A) i)$ Lindlar's catalyst, $H _2$; $ii$) $SnCl _2 / HCl$; iii) $NaBH _4$; iv) $H _3 O ^{+}$

$(B) i)$ Lindlar's catalyst, $H _2$; $ii$) $H _3 O ^{+}; iii)$ $SnCl _2 / HCl$; iv) $NaBH _4$

$(C) i)$ $NaBH _4; ii)$ $SnCl _2 / HCl; $iii$)$ $H _3 O ^{+}; iv)$ Lindlar's catalyst, $H _2$

$(D) i)$ Lindlar's catalyst, $H _2$; $ii$) $NaBH _4; iii)$ $SnCl _2 / HCl; iv)$ $H _3 O ^{+}$

→
The rate constant for the reaction $2N_2O_5 \to  4NO_2 + O_2$ is $3.0\times10^{-5}\, sec^{-1}$. If rate is $2.40\times10^{-5}\, M\, sec^{-1}$, then the concentration of $N_2O_5$ (in $M$) is ?
→
A solution of urea (mol. mass $56\,g\,mol^{-1}$ ) boils at $100.18\,^oC$ at the atmospheric pressure. If $K_f$ and $K_b$ for water are $1.86$ and $0.512\,K\,kg\,mol^{-1}$ respectively, the above solution will freeze at ........... $^oC$.
→
In a reaction

$C{H_2} = C{H_2}\xrightarrow[{oxid}]{{Hypochloro}}$ $M\xrightarrow{R}\begin{array}{*{20}{c}}
  {C{H_2} - OH} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_2} - OH} 
\end{array}$

Where $M$ = molecule; $R$ = reagent $M$ and $R$ are

→
Consider the above chemical reaction. The total number of stereoisomers possible for product $'\mathrm{P}^{\prime}$ is $.....$
→
Match each coordination compound in List $-I$ with an appropriate pair of characteristics from List $-II$ and select the correct answer using the code given below the lists. $\{en$ $= H_2NCH_2CH_2NH_2$, atomic numbers : $Ti = 22; Cr = 24; Co = 27; Pt = 78$ $ \}$
  List$-I$   List$-II$
$(P)$ $[Cr(NH_3)_4Cl_2]Cl$ $(1)$ Paramagnetic and exhibits ionisation isomerism
$(Q)$ $[Ti(H_2O)_5Cl](NO_3)_2$ $(2)$ Diamagnetic and exhibits cis-trans isomerism
$(R)$ $[Pt(en)(NH_3)Cl]NO_3$ $(3)$ Paramagnetic and exhibits cis-trans isomerism
$(S)$ $[Co(NH_3)_4(NO_3)_2]NO_3$ $(4)$ Diamagnetic and exhibits ionisation isomerism
→
A reaction of cobalt $(III)$ chloride and ethylenediamine in a $1 : 2$ mole ratio generates two isomeric products $A$ (violet coloured) and $B$ (green coloured). $A$ can show optical activity, but, $B$ is optically inactive. What type of isomers does $A$ and $B$ represent?
→