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A solid crystal is composed of X, Y and Z atoms. Y atoms are occupying 50% of octahedral voids, whereas X atoms are occupying the 100% tetrahedral void with Z atoms present in the ccp array arrangement, then the formula of the compound in the given crystal is

Which of the following orbital has most energy in multi-electron system?

What is a law

The volume of water that must be added to a mixture of 250 ml of 0.6 M HCl and 750 ml of 0.2 M HCl to obtain 0.25 M solution of HCl is

Which of the following does not contain any coordinate bond?

The major product of the following reaction sequence is:

$4BC{l}_3+3LiAl{H}_4\stackrel{Ether}{\to }A+LiCl+AlC{l}_3$

Calculate the number of $FeS{O}_4.7H_{2}O$ formula units in $0.2$ millimoles of pure $FeS{O}_4.7H_{2}O$

(a) Two stable isotopes
of lithium

and
have
respective abundances of 7.5% and 92.5%. These isotopes have masses
6.01512 u and 7.01600 u, respectively. Find the atomic mass of
lithium.

(b) Boron has two stable isotopes,
and.
Their respective masses are 10.01294 u and 11.00931 u, and the atomic
mass of boron is 10.811 u. Find the abundances of

and
.

Which of the following plots doesnot represent the behaviour of an ideal binary liquid solution ?

Ring chain isomerism is due to:

Which one of the following combinations illustrate the law of reciprocal proportions?

A solution containing 30 gms of non-volatile solute in exactly 90 gm water has a vapour pressure of 21.85 mm Hg at 25⁰C. Further 18 gms of water is then added to the solution. The resulting solution has a vapour pressure of 22.15 mm Hg at 25⁰C. Calculate the molecular weight of the solute.

Which of the following molecule(s) is/are having a see - saw geometry?

Write nuclear reaction equations for

(i)
α-decay
of
(ii)
α-decay
of

(iii)
β⁻-decay
of
(iv)
β⁻-decay
of

(v)
β⁺-decay
of
(vi)
β⁺-decay
of

(vii)
Electron capture of

For a monotomic gas, the value of the ratio of $C_{p.m}\text{and}{C}_{v.m}$ is

Carbohydrates are essential for life in both plants and animals. Name the carbohydrates that are used as storae molecules in plants and animals, also name the carbohydrate which is present in wood or in the fibre of cotton cloth.

The density and edge length values for a crystalline element with fcc lattice are 10 g $c{m}^{-3}$ and 400 pm respectively. The number of unit cells in 32 g of this crystal is

Choose the hydrate which exhibit Hydrogen bonding.

1 – propanol can be prepared from propene by

Dry distillation of barium salt of Hexane-1,2- dicarboxylic acid gives:

Distinguish between specific reaction rate and rate of the reaction

If the radius of first orbit of H - atom is $a_0$, then de Broglie wavelength of electron in 4th orbit is ?

In the nucleophilic substitution reaction in alkyl halides (R-X) , the nucleophile replaces:

The degree of hydrolysis of ammonium acetate

Which of the following compound will have the highest $C-H_a$ bond energy?

Which of the following can act both as Bronsted acid and Bronsted base