Download App

STD 12 - 4. d and f- block elements — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 4. d and f- block elements4 Marks
MCQ
Assertion : Transition metals show variable valency.

Reason : Transition metals have a large energy difference between the $ns^2$ and $(n -1)d$ electrons.

  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • ✓
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: C.
If the Assertion is correct but Reason is incorrect.
c
The assertion is correct but the reason is false. Actually transition metal show  variable valency due to very small difference between the $ns^2$ and $(n -1)d$ electrons.

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

$\begin{array}{*{20}{c}}
  {O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {Ph - C - OH\xrightarrow[\Delta ]{{N{H_3}}}(A){\mkern 1mu} \xrightarrow[{KOH}]{{B{r_2}}}(B),{\mkern 1mu} } 
\end{array}{\mkern 1mu} {\mkern 1mu}$  product $B$  is
→
Which of the following can have structure with $sp^3\,C$ atoms only
→
Incorrect statements among the following is/are
→
Bond dissociation energy of $E - H$ bond of the " $H _2 E$ " hydrides of group $16$ elements (given below), follows order.

$(A)$ $O$

$(B)$ $S$

$(C)$ $Se$

$(D)$ $Te$

→
The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are
→
Consider the following four elements, which are represented according to long form of periodic table.

Here $W, Y$ and $Z$ are left, up and right elements with respect to the element $'X'$  and $'X'$ belongs to $16^{th}$ group and $3^{rd}$ period. Then according to given  information the incorrect statement regarding given elements is

→
The difference in energy between the actual structure and the lowest energy resonance structure for the given compound is
→
The two compounds $[Co(SO_4)(NH_3)_5]Br$ and $[Co(SO_4)(NH_3)_5]Cl$ represent :
→
The amine that reacts will Hinsberg's reagent to give an alkali insoluble product is
→
Consider the following statements

$I.$  In gaseous phase, the vapour pressure of $CH_3COOH$ is less than expected. 

$II.$ In benzene, acetic acid dimerises.

$III.\, CH_3OH$ is more viscous than $H_2O.$

$IV.\, CH_3OCH_3$ is non-polar but soluble in water. 

Select the correct set of codes using $T$ for true and $F$ for false statements in given sequence.

→