The number of sigma $(\sigma)$ bonds in $but-1-ene$ is:

The following reaction occurs in the Blast Furnace where iron ore is reduced to iron metal:
$Fe_2O_{3(s)} + 3CO_{(g)} \rightleftharpoons 2Fe_{(l)} + 3CO_{2(g)}$
Using the Le Chatelier's principle,predict which one of the following will not disturb the equilibrium?

The structure of $Cl_2O_7$ is ......

How many $ATP$ molecules are released when one molecule of glucose is oxidized in our liver cells?

$A$ steel meter scale is to be ruled so that millimeter intervals are accurate within about $5 \times 10^{-5} \ m$ at a certain temperature. The maximum temperature variation allowable during the ruling is (Coefficient of linear expansion of steel $= 10 \times 10^{-6} \ K^{-1}$) (in $^{\circ} C$)

The $pK_a$ values of four carboxylic acids are given below. Identify the weakest carboxylic acid.