The number of water molecule(s) not coordinated to copper ion directly in CuSO4.5H2O, is :

The strength of 11.2 volume solution of H2O2 is : [Given that molar mass of H = 1 g mol–1 and O = 16 g mol–1]

100 mL of a water sample contains 0.81 g of calcium bicrabonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of CaCO3 is : (Molar mass of calcium bicarbonate is 162 g mol–1 and magnesium bicarbonate is 146 g mol–1)

NaH is an example of :

The correct statements among (a) to (d) regarding H2 as a fuel are : (a) It produces less pollutants than petrol. (b) A cylinder of compressed dihydrogen weighs $$\sim$$ 30 times more than a petrol tank producing the same amount of energy. (c) Dihydrogen is stored in tanks of metal alloys like NaNi5. (d) On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 KJ, respectively.

The chemical nature of hydrogen peroxide is :

The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are :

The temporary hardness of water is due to :

The isotopes of hydrogen are :

The volume strength of 1M H2O2 is : (Molar mass of H2O2 = 34 g mol–1)

At 100oC, copper (Cu) has FCC unit cell structure with cell edge length of x $$\stackrel{o}{A}$$. What is the approximate density of Cu (in g cm$$-$$3) at this temperature? [Atomic Mass of Cu = 63.55 u]

The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic structure are, respectively :

An element has a face-centred cubic (fcc) structure with a cell edge of $$a$$. The distance between the centres of two nearest tetrahedral voids in the lattice is :

10 mL of 1mM surfactant solution forms a monolayer covering 0.24 cm2 on a polar substrate. If the polar head is approximated as cube, what is its edge length?

Consider the bcc unit cells of the solids 1 and 2 with the position of atoms as shown below. The radius of atom B is twice that of atom A. The unit cell edge length is 50% more in solid 2 than in 1. What is the approximate packing efficiency in solid 2?

0.27 g of a long chain fatty acid was dissolved in 100 cm3 of hexane. 10 mL of this solution was added dropwise to the surface of water in a round watch glass. Hexane evaporates and a monolayer is formed. The distance from edge to centre of the watch glass is 10 cm. What is the height of the monolayer? [Density of fatty acid = 0.9 g cm–3, $$\pi$$ = 3]

Element 'B' forms ccp structure and 'A' occupies half of the octahedral voids, while oxygen atoms occupy all the tetrahedral voids, The structure of bimetallic oxide is :

The radius of the largest sphere which fits properly at the centre of the edge of a body centred cubic unit cell is : (Edge length is represented by 'a')

A solid having density of 9$$\times$$103 kg m–3 forms face centred cubic crystals of edge length $$200\sqrt{2}$$ pm. What is the molar mass of the solid? [Avogadro constant $$\cong$$ 6 $$\times$$ 1023 mol–1 , $$\pi$$ $$\cong$$ 3]

A compound of formula A2B3 has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms :