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In a sample of calcium phosphate ,Ca_3(PO_{4)}, 0.432 moles of phosphorous is present, what is amount of calcium phosphate is present in the sample if sample is 100% pure

What are Sigma and Pi bonds?

Silicones has the general formula:

In Wurtz reaction of alkyl halides with sodium the reactivity
order of these halides is:

In the following reaction:
$P_4\left(s\right)+O{H}^{-}\left(aq\right)\to P{H}_3\left(g\right)+H_{2}P{O}_2^{-}\left(aq\right)$
Calculate the stoichiometric coefficient of $O{H}^{-}$ and $H_{2}O$ respectively present in a balanced equation in a basic medium?

Product (B) of the given reaction is ?

If $x,y\text{and}z$ are electronegativity, ionisation potential and electron-affinity respectively. Then the electron affinity $\left(z\right)$ in the terms of electronegativity $\left(x\right)$ and ionisation potential $\left(y\right)$ will be:

With Fehling’s solution, Aldehydes give :

Which of the following catalyst is used in hydrogenation of vegetable oils?

The enthalpy of formation of a compound is

Which of the following chemical formula is correct?

A
solution of Ni(NO₃)₂
is electrolysed between platinum electrodes using a current of 5
amperes for 20 minutes. What mass of Ni is deposited at the cathode?

Explain why

(i) the dipole
moment of chlorobenzene is lower than that of cyclohexyl chloride?

(ii) alkyl
halides, though polar, are immiscible with water?

(iii) Grignard
reagents should be prepared under anhydrous conditions?

For the following
equilibrium,

Both
the forward and reverse reactions in the equilibrium are elementary
bimolecular reactions. What is K_c,
for the reverse reaction?

Adsorption of gases on solid surfaces is generally exothermic because:

The number of atoms per unit cell in a face centred cubic arrangement is:

Match the elements of given atomic number with their properties.

Given that bond energies of $H-H$ and $Cl-Cl$ are $430{\text{kJ mol}}^{-1}$ and $240{\text{kJ mol}}^{-1},$ respectively and $\Delta H_f$ for $HCl$ is $-90{\text{kJ mol}}^{-1},$ bond enthalpy of $HCl$ is:

Which of the following will undergo a faster $S_{N}1$?

Match the reactions with products:

The carbide which gives propyne on hydrolysis is :

Which of the following compounds have a stable trans isomer than its cis form?

The azide anion

Using the equation of state PV = nRT; show that at a given temperature density of a gas is proportional to gas pressurep.

The number of gram molecules of oxygen in 6.02*10^24 CO molecules is

The wavelength of radiation which would cause the photodissociation of chlorine molecule if the $Cl-Cl$ bond energy is $243kJmo{l}^{-1}$ is (h = $6.6\times {10}^{-34}Js$).

How many grams of hydrogen gas is required to produce 4.8 mol of ammonia on a reaction with an excess of nitrogen?

The $LUMO$ in $CO$ is

The starting substance for the preparation of $C{H}_{3}I$ is

Which one of the following sets of ions represents a collection of isoelectronic species?

$\text{The volume of}2.8\text{g}\text{of carbon monoxide at}{27}^{\circ }\text{C}\text{and}0.821\text{atm is}$

Graphite is similar to

The hybridization involved in complex $\left[Ni\right(CN{)}_4{]}^{2-}$ is (Atomic number of Ni = 28)

The oxidation state of Cu and Fe in $CuFe{S}_2$ are ___ and___respectively