(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

Explain why Anhydrous FeCl₃ cannot be prepared by heating hydrated iron (III) chloride.

For each of the salt: A, B, C and D, suggest a suitable method of its preparation.

A is a sodium salt.

State the term defined by the following sentence:

An acidic solution in which there is only partial ionisation of the solute molecules.

Choose the most appropriate answer from

(SO₂, SiO₂, Al₂O₃, CO, MgO, Na₂O)

A covalent oxide of a metalloid.

Write balanced equation copper sulphate solution with ammonium hydroxide solution.

The salt solution which does not react with ammonium hydroxide is ______.

What do you observe when caustic soda solution is added to the following solution: first a little and then in excess:

CuSO₄

Write a balanced equation for this reaction.

On analysis, a substance was found to contain:

C = 54.54%, H = 9.09%, O = 36.36%

The vapour density of the substance is 44, calculate its empirical formula.

An organic compound, whose vapour density is 45, has the following percentage composition,

H = 2.22%, O = 71.19% and remaining carbon. Calculate its empirical formula.

An organic compound contains H = 4.07%, Cl = 71.65% chlorine and remaining carbon. Its molar mass = 98.96. Find its Empirical formula.

A hydrocarbon contains 4.8g of carbon per gram of hydrogen. Calculate:

find the empirical formula.

Determine the formula of the organic compound if its molecule contains 12 atoms of carbon. The percentage compositions of hydrogen and oxygen are 6.48 and 51.42 respectively.

10.47 g of a compound contained 6.25 g of metal A and rest non-metal B. Calculate the empirical formula of the compound [At. wt of A = 207, B = 35.5]

A hydride of nitrogen contains 87.5% percent by mass of nitrogen. Determine the empirical formula of this compound.

Find the empirical formula of a compound containing 17.64% hydrogen and 82.35% of nitrogen.

A compound X consists of 4.8% carbon and 95.2% bromine by mass. Determine the empirical formula of this compound working correctly to one decimal place (C = 12; Br = 80).

The percentage composition of sodium phosphate as determined by analysis is 42.1% sodium, 18.9% phosphorus and 39% oxygen. Find the empirical formula of the compound.

An experiment showed that in a lead chloride solution, 6.21 g of lead is combined with 4.26 g of chlorine. What is the empirical formula of this chlorine? (Pb = 207; Cl = 35.5)

Mention the colour changes observed when the following indicators are added:

Explain the following:

H₃PO₃ is not a tribasic acid