Five Grams Of Each Of The Following Gases At 87oC And 750 Mm Pressure Are Taken. Which Of Them Will Have The Least Volume?

The formula weight of an acid is 82.0 in a titration 100 cm³ of a solution of this acid containing 39.0 g of the acid per litre were completelyneutralised by 95.0 cm³ of aqueous NaOH containing 40 .0 g of NaOHper litre. What is the basicity of the acid?

An analysis of a pyrex glass showed 12.9% B₂O₃, 2.2% Al₂O₃, 3.8% Na₂O, 0.4% K₂O and remaining is SiO₂. What is the ratio of Si to B atoms in the glass?

One litre of a gas is at a pressure of 10^–6 mm of Hg at 25^oC. How many molecules are present in the vessel?

27 g of Al (at mass = 27) will react with oxygen equal to

2.76 g of silver carbonate (at mass of Ag = 108) on being heated strongly yields a residue weighing 

If 0.5 mol of BaCl₂ is mixed with 0.2 mol of Na₃PO₄, the maximum number of moles of Ba₃(PO₄)₂ that can be formed is

If 10²¹ molecules are removed from 200 mg of CO₂, then the number of moles of CO₂ left are

The  number of gram molecules of oxygen in  molecules is

The molecular weight of O₂ and SO₂ are 32 and 64 respectively. If onelitre of O₂ at 15^oC and 750 mm contains N molecules, the number of molecules in two litres of SO₂ under the same conditions of temperature and pressure will be

Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (at wt. of Fe = 56) present in one molecule of haemoglobin is