Class 11th

Among statements (a) - (d), the correct ones are
(a) Decomposition of hydrogen peroxide gives dioxygen.
(b) Like hydrogen peroxide, compounds such as ${\mathrm{K}\mathrm{C}\mathrm{l}\mathrm{O}}_3,\mathrm{P}\mathrm{b}{\left({\mathrm{N}\mathrm{O}}_3\right)}_2$ and ${\mathrm{N}\mathrm{a}\mathrm{N}\mathrm{O}}_3$  when heated liberated dioxygen.
(c) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide
(d) Hydrogen peroxide is used for the manufacture of sodium perborate

The total number of acidic oxides from the following list is NO, N₂O, B₂O₃, N₂O₅, CO, SO₃, P₄O₁₀

The correct order of density is

High purity (> 99.95%) dihydrogen is obtained by

The first ionization entahalpies of Be, B, N and O follow the order

What is the Z distribution and Chi-squared distribution?

$K_{a_1},K_{a_2}and{K}_{a_3}$ are the respective ionization constants for the following reaction (a), (b) and (c).

(A) $H_2{C}_2{O}_4?H^{+}+H{C}_2{O}_4^{-}$

(B) $H{C}_2{O}_4^{+}?H^{-}+C_2{O}_4^{2-}$

(C) $H_2{C}_2{O}_4?2H^{+}+C_2{d}_4^{2-}$

What are the 5 types of sample statistics?

Which of the following is structure of a separating funnel?

Given below are two statements:

Statement I : Classical smog occurs in cold humid climate. It is reducing mixture of smoke, fog and sulphur dioxide.

Statement II : Photochemical smog has components, ozone, nitric oxide, acrolein formaldehyde, PAN etc.

In the light f the above statements, choose the most appropriate answer from the option given below.