The oxidation number of $Pt$ in $[Pt(C_2H_4)Cl_3]^-$ is

Which of the following organisms possesses a cell wall?

When $H_2SO_4$ reacts with $PCl_5$,the obtained product is/are:

$A:$ Hormones are non-nutrient chemicals.
$B:$ They act as intercellular messengers and are produced in large amounts.

In the expansion of $(1+x)^n$,the coefficients of $p$-th and $(p+1)$-th terms are respectively $p$ and $q$. Then $p+q=$

$A$ diatomic ideal gas is used in a Carnot engine as the working substance. If during the adiabatic expansion part of the cycle the volume of the gas increases from $V$ to $32V$,the efficiency of the engine is