HSC Science Class 11 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

According to Raoults law, the relative lowering of vapour pressure for a solution is equal to ______.

The relative lowering of vapour pressure of a sugar solution in water is 2.5 × 10^-3. The mole fraction of water in that solution is ______.

Which of the following aqueous solutions has the highest boiling point?

The vapour pressure of pure benzene (C₆H₆) at a given temperature is 640 mm Hg. 2.2 g of non – volatile solute is added to 40 g of benzene. The vapour pressure of the solution is 600 mm Hg. Calculate the molar mass of the solute?

A sample of 0.5 g of an organic compound was treated according to Kjeldahl’s method. The ammonia evolved was absorbed in 50mL of 0.5 M H₂SO₄ The remaining acid after neutralization by ammonia consumed 80 mL of 0.5 M NaOH. The percentage of nitrogen in the organic compound is.

In an organic compound, phosphorus is estimated as ______.

Give the principle involved in the estimation of halogen in an organic compound by Carius method.

0.30 g of a substance gives 0.88 g of carbon dioxide and 0.54 g of water calculate the percentage of carbon and hydrogen in it.

The ammonia evolved form 0.20 g of an organic compound by Kjeldahl method neutralized 15 ml of N/20 sulphuric acid solution. Calculate the percentage of Nitrogen.

0.32 g of an organic compound, after heating with fuming nitric acid and barium nitrate crystals is a sealed tube game 0.466 g of barium sulphate. Determine the percentage of sulphur in the compound.

0.24g of an organic compound gave 0.287 g of silver chloride in the carius method. Calculate the percentage of chlorine in the compound.

In the estimation of nitrogen present in an organic compound by Dumas method 0.35 g yielded 20.7 mL of nitrogen at 15° C and 760 mm pressure. Calculate the percentage of nitrogen in the compound.

1 g of an impure sample of magnesium carbonate (containing no thermally decomposable impurities) on complete thermal decomposition gave 0.44 g of carbon dioxide gas. The percentage of impurity in the sample is

When 6.3 g of sodium bicarbonate is added to 30 g of acetic acid solution, the residual solution is found to weigh 33 g. The number of moles of carbon dioxide released in the reaction is

Choose the disproportionation reaction among the following redox reactions.

Total number of electrons present in 1.7 g of ammonia is

The correct increasing order of the oxidation state of sulphur in the anions \[\ce{SO^2-_4, SO^2-_3, S2O^2-_4, S2O^2-_6}\] is

Which of the following contains the same number of carbon atoms as in 6 g of carbon-12.

What do you understand by the term oxidation number?

Distinguish between oxidation and reduction.