Catalyst used in the manufacture of high density polythene is

Observe the following statements :
a. The thermal stability of hydrides of group 16 elements follow the order :
\(\mathrm{H}_2 \mathrm{O}>\mathrm{H}_2 \mathrm{~S}>\mathrm{H}_2 \mathrm{Se}>\mathrm{H}_2 \mathrm{Te}\)
b. Acidic nature of hydrides of group 16 elements follow the order :
\(\mathrm{H}_2 \mathrm{O}>\mathrm{H}_2 \mathrm{~S}>\mathrm{H}_2 \mathrm{Se}>\mathrm{H}_2 \mathrm{Te}\)
c. The reducing nature of \(\mathrm{H}_2 \mathrm{~S}, \mathrm{H}_2 \mathrm{Se}\) and \(\mathrm{H}_2\) Te follow the order :
\(\mathrm{H}_2 \mathrm{~S} < \mathrm{H}_2 \mathrm{Se} < \mathrm{H}_2 \mathrm{Te}\)
The correct statement are:

Consider the following statements:
I. In diamond, each carbon atom is \(s p^3\)-hybridised.
II. Graphite has planar hexagonal layers of carbon atoms.
III. Silicones being surrounded by non-polar alkyl groups are water repelling in nature
IV. The order of catenation in group 14 elements is \(\mathrm{Si}>\mathrm{C}>\mathrm{Sn}>\mathrm{Ge}>\mathrm{Pb}\).

The correct statements are

The crystal structure of an element has fcc lattice. If the edge length of the crystal is \(4^{\circ} \mathrm{A}\), what is the atomic weight (in \(\mathrm{g} \mathrm{mol}^{-1}\) ) of the element, if the density of the crystal is \(\left.11.21 \mathrm{~g} \mathrm{~cm}^{-3}\right)\left(\mathrm{N}_{\mathrm{A}}=6.023 \times 10^{23} \mathrm{~mol}^{-1}\right)\)

A plot of $\log (\mathrm{x}/\mathrm{m})$ verses $\log \left(\mathrm{P}\right)$ for adsorption of a gas on a solid gives a straight line with a slope of

What are the formal charges on terminal oxygens of ozone molecule?

Identify the reaction for which \(\Delta H \neq \Delta E\) :

If \(y=|\cos x-\sin x|+|\tan x-\cot x|\), then \(\left(\frac{d y}{d x}\right)_{x=\frac{\pi}{3}}+\left(\frac{d y}{d x}\right)_{x=\frac{\pi}{6}}=\)

\(\int_0^{\pi / 2} \log _e(\sin 2 x) d x\)

If \(f(x)=\frac{1}{\sqrt{x+2 \sqrt{2 x-4}}}+\frac{1}{\sqrt{x-2 \sqrt{2 x-4}}}\) for \(x>2\), then \(f(11)\) is equal to

What is the phase difference between the flux linked with a coil rotating in a magnetic field and the induced emf produced in it?

The coefficient of \(x^4\) in the power series expansion of \(\frac{x^2-1}{\left(x^2+1\right)\left(x^2+2\right)}\) is

When a train is approaching the stationary observer, the apparent frequency of the whistle of the train is \(n_1\) and when the train is moving away from the observer, the apparent frequency is \(n_2\). The frequency of the whistle noticed by the observer when he moves with the train is _________ .