MCQ
Least reactive metal is
  • A
    $Fe$
  • B
    $Os$
  • C
    $Ni$
  • $Pt$

Answer

Correct option: D.
$Pt$
d
(d) $Pt,$ because it is a noble metal and does not react with air, water or acid at room temperature.

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

Similar questions

${\lambda _{ClC{H_2}COONa}} = 224\;oh{m^{ - 1}}\,c{m^2}\,gme{q^{ - 1}}$,

${\lambda _{NaCl}} = 38.2\;oh{m^{ - 1}}\,c{m^2}\,gme{q^{ - 1}}$,

${\lambda _{HCl}} = 203\;oh{m^{ - 1}}\,c{m^2}\,gme{q^{ - 1}}$,

What is the value of ${\lambda _{ClC{H_2}COOH}}$ .............. ${\rm{Oh}}{{\rm{m}}^{ - 1}}{\mkern 1mu} {\rm{c}}{{\rm{m}}^2}{\rm{gm}}\,{\rm{e}}{{\rm{q}}^{ - 1}}$

Which one of the following organic compounds decolourizes an alkaline $KMn{O_4}$ solution
The metal which does not form a polynuclear carbonyl is
The magnetic moment of an octahedral homoleptic $Mn(II)$ complex is $5.9\,BM.$ The suitable ligand for this complex is
The $IUPAC$ name of  $\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\ 
  {C{H_3} - C = CH - C{H_2} - C} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,COO{C_2}{H_5}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,OH\,} 
\end{array}$ is
Which $\beta$ - keto acid shown will not undergo decarboxylation ?
Which reactions are most common in alkenes
In Carius method of estimation of halogens, $250 \,mg$ of an organic compound gave $141 \,mg$ of $AgBr.$ The percentage of bromine in the compound is : 

(at. mass $Ag =108; Br = 80$)

For the adsorption of hydrogen on platinum,the activation energy is $30\,kJ\,mol ^{-1}$ and for the adsorption of hydrogen on nickel,the activation energy is $41.4\,kJ\,mol ^{-1}$. The logarithm of the ratio of the rates of chemisorption on equal areas of the metals at $300\,K$ is $........$(Nearest integer)Given: $\ln 10=2.3 \quad R=8.3\,JK ^{-1}\,mol ^{-1}$
What is the order of a reaction which has a rate expression rate $ = K{[A]^{3/2}}{[B]^{ - 1}}$