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A cylinder contains hydrogen has (Molar mass $M$) at pressure $P$ and temperature $T$. If $R$ is universal gas constant, then the density of gas is given as

An electron in an atom undergoes transition in such a way that its kinetic energy changes from $x$ to $\frac{x}{4}$. The change in potential energy will be:

For the reaction $A+2B\rightleftharpoons C+D,$ the equilibrium constant is $1.0\times {10}^8$. Calculate the equilibrium concentration of A if 1.0 mole of A and 3.0 mole of B are placed in 1L flask and allowed to attain the equilibrium ?

Which alkene on reductive ozonolysis gives 1 mole each of propan-2-one, formaldehyde and 2,4-dioxohexanedial?

$400c{m}^3$ of oxygen at ${27}^{\circ }C$ were cooled to $-3^{\circ }C$ without change in pressure. The contraction in volume will be

Consider the following complex ions:
$P,Q,$ and $R$. $P=[Fe{F}_6{]}^{3-},Q=[V(H_{2}O{)}_6{]}^{2+}$ and $R=\left[Fe\right(H_{2}O{)}_6{]}^{2+}$
The correct order of the complex ions, according to their spin only magnetic moment values (in BM) is:

Some statements are given below

A) The sugar present in RNA is D - ribose

B) Adenine forms 3 hydrogen bonds with Thymine

C) Phosphate ester of nucleoside is nucleotide

D) Cytosine is not present in RNA but present in DNA

Among these statements

Reaction rates can change with

Find the number of nodal plane in Highest Occupied Molecular Orbital ($HOMO$) of $O_2$ molecule.

The correct order of decreasing ionic radii among the following isoelectronic species is:

The coagulation of 100 ml of colloidal solution of gold is completely prevented by addition of 0.25 g of a substance “X” to it before adding 1 ml of 10% NaCl solution. The gold number of “X” is

What will be the pressure exerted by a mixture of 3.2 g of methane and 4.4 g of carbon dioxide contained in a $9d{m}^3$ flask at ${27}^{\circ }C$ ?

If x denoted the number of valence electrons of a representative element then its valence is equal to:

The compound that is not a Lewis acid is :

Determine the heat of the following reaction:

$FeO\left(s\right)+F{e}_2{O}_3\left(s\right)\to F{e}_3{O}_4\left(s\right)$

Given informations:

$2Fe\left(s\right)+O_2\left(g\right)\to 2FeO\left(s\right);\Delta H^{\circ }=-544kJ4Fe\left(s\right)+3O_2\left(g\right)\to 2F{e}_2{O}_3\left(s\right);\Delta H^{\circ }=-1648.4kJF{e}_3{O}_4\left(s\right)\to 3Fe\left(s\right)+2O_2\left(g\right);\Delta H^{\circ }=+1118.4kJ$

What is $pH$ of the half cell $H^{+}\left(\text{aq}\right)|H_2(g,1\text{atm})|Pt\left(s\right)$

if $E_{H^{+}\left(\text{aq}\right)|H_2\left(g\right)}=-0.25\text{V}$ ?