AIEEE 2012 PYQ Mock Test

Iron exhibits $+2$ and $+3$ oxidation states. Which of the following statements about iron is incorrect?

The pH of a $0.1$ molar solution of the acid $\text{HQ}$ is $3$. The value of the ionization constant, $K_a$ of this acid is:

Which branched chain isomer of the hydrocarbon with molecular mass $72\text{u}$ gives only one isomer of mono substituted alkyl halide?

$K_f$ for water is $1.86{\text{K kg mol}}^{-1}$. If your automobile radiator holds $1.0\text{kg}$ of water, how many grams of ethylene glycol (${\text{C}}_2{\text{H}}_6{\text{O}}_2$) must you add to get the freezing point of the solution lowered to $-2.8^{\circ }\text{C}$?

What is DDT among the following?