If the density of water is 1 gm/cm3 , then the volume occupied by one molecule of water is approximately-

How many grams are contained in 1gm-atom of Na -

1.35 gm of pure Ca metal was quantitatively converted into 1.88 gm of pure CaO. What is atomic weight of Ca -

The % loss in weight after heating a pure sample of potassium chlorate (M. wt. 122.5) will be -

The minimum quantity in gram of H2S needed to precipitate 63.5 gm of Cu+2 will be nearly

Mass of H2O in 1000 kg CuSO4 .5H2O is - (Cu = 63.5)

Phosphine (PH3 ) decomposes to produce vapours of phosphorus and H2 gas. What will be the change in volume when 100 mL of phosphine is decomposed ?

In the reaction 4A + 2B + 3C  A4B2C3 , what will be the number of moles of product formed, starting from one mole of A, 0.6 mole of B and 0.72 mole of C ?

8 gm of O2 has the same number of molecules as-

4.4 gm of CO2 and 2.24 litre of H2 at STP are mixed in a container. The total number of molecules present in the container will be -

Find the volume of CO2 obtained at S.T.P. on heating 200 gm of 50% pure CaCO3 -

2.76 gm of silver carbonate on being strongly heated yields a residue weighing -

A sample of AlF3 contains 3.0 × 1024 F– ions. The number of formula units in this sample are -

Calculate the gm quantity of Na2CO3 which has same No. of atoms as the No. of protons present in 10 gm CaCO3 -

The mass of CaCO3 produced when carbon dioxide is passed in excess through 500 ml of 0.5 M Ca(OH)2 will be

The mass of 70% pure H2SO4 required for neutralisation of 1 mol of NaOH -

A sample of hard water is found to contain 40 mg of Ca+2 ion per litre. The amount of washing soda (Na2CO3 ) required to soften five litres of the sample would be -

The mass of oxygen that would be required to produce enough CO, which completely reduces 1.6 kg Fe2O3 (at. mass Fe = 56) is

1.5 gm of divalent metal displaced 4 gm of copper (at. wt. = 64) from a solution of copper sulphate. The atomic weight of the metal is-

Avogadro's number of Rupees can be spent in ..........years if 10 lac rupees per second are spent -

The amount of sulphur required to produce 100 moles of H2SO4 is -

The vapour density of a mixture containing NO2 and N2O4 is 38.3 at 27º C. The moles of NO2 in 100 mole mixture is

Assuming that petrol is iso-octane (C8H18) and has density 0.8 gm/ml, 1.425 litre of petrol on complete combustion will consume oxygen 

The conversion of oxygen to ozone occurs to the extent of 15% only. The mass of ozone that can be prepared from 67.2 L of oxygen at S.T.P. will be -

10 moles of SO2 and 4 moles of O2 are mixed in a closed vessel of volume 2 litres. The mixture is heated in presence of Pt catalyst. Following reaction takes place : 2SO2 (g) + O2 (g)  2SO3 (g) Assuming the reaction proceeds to completion.

Select the correct statement -

Number of moles of SO3 formed in the reaction will be -

Number of moles of excess reactant remaining -

The calculation on the given reaction is based on -

Total number of moles of gaseous component will ...... after the reaction -

Equal volumes of different gases under similar conditions of temperature and pressure contain equal number of atoms.

1 mole of C12H22O11 contains 22 hydrogen atoms

Nitrogen forms five oxides. It proves the law of multiple proportions.

Empirical formula = (Molecular formula) × n

Mass of 3.01 × 1023 molecules of methane is 8 gm.

Avogadro’s number varies with temperature and pressure.

18 gm of water vapour and 18 gm of ice will not contain the same number of molecules

The weight of 2.01 × 1023 molecules of CO is -

In an organic compound of molar mass 108 gm mol–1 C, H and N atoms are present in 9 : 1 : 3.5 by weight. Molecular formula can be –

Number of atoms in 560 gm of Fe (atomic mass 56 g mol–1) is –

6.02 ×1020 molecules of urea are present in 100 ml of its solution. The concentration of urea solution is -

How many moles of magnesium phosphate, Mg3 (PO4 ) 2 will contain 0.25 mole of oxygen atoms ?

n the reaction, 2Al(s) + 6HCl(aq)  2Al3+ (aq) + 6Cl¯(aq) + 3H2 (g)

The weight of 1 × 1022 molecules of CuSO4 .5H2O is -

Rearrange the following (I to IV) in the order of increasing masses and choose the correct Answer from (A), (B), (C) and (D) (At. mass : N = 14, O = 16, Cu = 63) (I) 1 molecule of O (II) 1 atom of nitrogen (III) 1 × 10–10 g molecular mass of oxygen (IV) 1 × 10–7 g atomic mass of copper

One mole of calcium phosphide on reaction with excess of water gives

At 100ºC and 1 atm, if the density of liquid water is 1.0 g cm–3 and that of water vapour is 0.0006 g cm–3 , then the volume occupied by water molecules in 1 litre of steam at that temperature is

How many moles of electron weigh one kilogram ?

Mixture X = 0.02 mol of [Co(NH3 ) 5 ] Br & 0.02 mol of [Co(NH3 ) 5 Br] SO4 was prepared in 2 litre of solution 1 litre of mixture X + excess AgNO3  Y 1 litre of mixture X + excess BaCl2  Z No. of moles of Y and Z are