The use of anti-histamine,adrenaline,and steroids quickly reduces the symptoms of:

$A$ very small hole in an electric furnace is used for heating metals. The hole nearly acts as a black body. The area of the hole is $200 ~mm^2$. To keep a metal at $727^{\circ} C$,the heat energy flowing through this hole per second,in joules,is $\left(\sigma = 5.67 \times 10^{-8} ~W m^{-2} K^{-4}\right)$.

The endosperm in angiosperms develops from

Consider the cell:
$Pt | H_2(P_1 \ atm) | H^{+}(x_1 \ M) || H^{+}(x_2 \ M) | H_2(P_2 \ atm) | Pt$.
The cell reaction will be spontaneous if

Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids,the main reason being

In the following reaction,$X$ and $Y$ respectively are:
$C_2H_5OH \xrightarrow{KMnO_4 / H^{+}} X$
$X \xrightarrow[H_2SO_4 / \Delta]{Y} CH_3COOC_2H_5$