A sample of water contains 11.1 ppm of CaCl₂ and 9.5 ppm of MGCl₂ the hardness of water sample is

For a reversible reaction, if the concentrations of the reactants are doubled, then the equilibrium constant value

9.2 grams of N₂O₄(g) is taken one liter vessel and heated till the following equilibrium is reached N₂O₄ (g)⇔2NO₂(g).At equilibrium 50% of N₂O₄(g) is dissociated.The value of Kc is

The correct trends in the hydrides from Bi to N is

The first organic compound synthesized in the laboratory from an inorganic compound is:

Solubility product of Ba(OH)₂ and Al(OH)₃ are 1.8x10^-10 and 2.4x10^-20 respectively.If both Al³⁺ and Ba⁺² ions are present is a solution,which one will be precipated on addition of Ammonium hydroxide solution

Oxide of nitrogen which gives reddish brown colour when exposed to air is

Active mass of 56 g of N₂ contained in 2 ltr.Flask is

The conjugate acid of SO₄^2- is

The flux used in the extraction of iron from Haematite in the blast furnace is