MCQ
Which of the following element has maximum density
  • A
    $Hg$
  • B
    $Au$
  • $Os$
  • D
    $Pb$

Answer

Correct option: C.
$Os$
c
Of all the metals, Osmium has the highest density of $22.59\,gm / cm ^3$.

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Choose the correct answer from the options given below:

$\begin{array}{*{20}{c}}
  {O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\ 
  {||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\ 
  {H - C - C{H_2}C{H_2}C{H_2}C{H_2} - C - H} 
\end{array}$ $\xrightarrow{{O\mathop {H/\Delta }\limits^{\Theta \,\,\,} }}$ Product $(A)$ is
Bubble gum contains $.......$
Thermally most stable compound is
A first order reaction with respect to the reactant $A $ has a rate constant of $6\;{\sec ^{ - 1}}$. If we start with $[A] = 0.5 $ $mol/litre$, then in what time the concentration of $A$  becomes $0.05 $ $mol/litre$ ........... $\sec$