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
MCQ
Choose the incorrect order?
  • A
    $Li > O > F$      ( $IE_2$ order)
  • B
    $Mg < S < Cl$      ( $EA$ order)
  • C
    $I > Br > N > O > F$     (Size)
  • ✓
    $Na < K < Ca$      $(Z_{eff})$
✓

Answer

Correct option: D.
$Na < K < Ca$      $(Z_{eff})$
d
As per Slater's rule

$\mathop {Li}\limits_{(1.3)}  < \mathop {Na}\limits_{(2.2)}  = \mathop K\limits_{(2.2)}  < \mathop {Ca\,\,\,\,\,\,\,\,\,\,}\limits_{(2.85) \leftarrow {Z_{eff}}} $

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

Which one of these is not compatible with arenes
→
$CaC{O_{3(s)}}$ $\rightleftharpoons$ $Ca{O_{(s)}} + C{O_{2(g)}}$ which of the following expression is correct
→
On electrolysis, which of the following does not give out oxygen ?
→
The incorrect statement regarding above reactions is

$\mathop {Al}\limits_{Metal} \xrightarrow{{HCl(aq.)}}'X' + Gas\,'P'$

$\mathop {Al}\limits_{metal} \xrightarrow[{ + {H_2}O}]{{NaOH\,(aq.)}}'Y' + Gas\,'Q'$

→
Which has highest melting point
→
Strongest nucleophile in polar protic solvent is
→
In an experiment, $m$ grams of a compound $X$ (gas/liquid/solid) taken in a container is loaded in a balance as shown in figure $I$ below. In the presence of a magnetic field, the pan with $X$ is either deflected upwards (figure $II$), or deflected downwards (figure $III$), depending on the compound $X$. Identify the correct statement($s$)

$(A)$ If $X$ is $H _2 O (l)$, deflection of the pan is upwards.

$(B)$ If $X$ is $K _4\left[ Fe ( CN )_6\right](s)$, deflection of the pan is upwards.

$(C)$ If $X$ is $O _2(g)$, deflection of the pan is downwards.

$(D)$ If $X$ is $C _6 H _6(l)$, deflection of the pan is downwards.

→
Assign $A, B, C, D$ from given type of reaction. $CuO + {H_2} \longrightarrow Cu \downarrow  + {H_2}O$
→
The combustion enthalpy of carbon, hydrogen and methane are $-393.5 ;\, -284.8$ and $-890.4\, kJ/mole$ respectively at $25\,^oC$ . The value of standard formation enthalpies of methane at that temperature is.....$kJ/mole$
→
In the cobalt-carbonyl complex: $\left[ Co _{2}( CO )_{8}\right]$, number of $Co-Co$ bonds is " $X$ " and terminal $CO$ ligands is $" Y ".$ $X + Y =...... .$
→