(English Medium) ICSE Class 10 - CISCE Important Questions for Chemistry

State one relevant observation for the following:

To the copper nitrate solution, initially, few drops of sodium hydroxide solution is added and then added in excess.

An amphoteric oxide.

The metal hydroxide which reacts with both acids and alkalis to form salt and water is ______.

Rita was given an unknown salt for identification. She prepared a solution of the salt and divided it into two parts.

• To the first part of the salt solution, she added a few drops of ammonium hydroxide and obtained a reddish-brown precipitate.
• To the second part of the salt solution, she added a few drops of silver nitrate solution and obtained a white precipitate.

Name:

1. The cation present and
2. The anion present in the salt given for identification.

Aqueous lead (II) nitrate can be distinguished from aqueous zinc nitrate by adding any of the following solutions in excess, except:

Which of the following about oxides is correct?

A ______ coloured precipitate is formed when ammonium hydroxide is added to a solution of ferrous chloride.

Propane burns in air according to the following equation: 

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

What volume of propane is consumed on using 1000 cm³ of air, considering only 20% of air contains oxygen?

State Gay-Lussac's law of combining volumes.

Calculate the percentage of water of crystallization in CuSO₄.5H₂O

(H = 1, O = 16, S = 32, Cu = 64)

A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure

1) Find the number of moles of hydrogen present.

2) What weight of CO2 can the cylinder hold under similar conditions of temperature and pressure? (H = 1, C = 12, O = 16)

3) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO₂ molecules in the cylinder under the same conditions of temperature and pressure.

4) State the law that helped you to arrive at the above result.

Choose the correct answer from the options given below:

The ratio between the number of molecules in 2g of hydrogen and 32g of oxygen is:

[Given that H = 1, O = 16]

Give balanced chemical equations for the following conversions A, B, and C:

The percentage composition of a gas is Nitrogen 82.35%, Hydrogen 17.64%. Find the empirical formula of the gas.  [N = 14, H = 1]

Aluminium carbide reacts with water according to the following equation :

`Al_4C_3 + 12H_2O-> 4Al(OH)_3 + 3CH_4`

1)What mass of aluminium hydroxide is formed from 12g of aluminium carbide?

2) What volume of methane at s.t.p. is obtained from 12g of aluminium carbide?

[Relatively molecular weight of `Al_4Cl_3 = 144; Al(OH)_3 = 78]`

Calculate the number of moles in 12g of oxygen gas.

Define the term.

Molar volume

The vapour density of CH₃OH is ______. (At. Wt. C = 12, H = 1, O = 16)

A compound of X and Y has the empirical formula XY₂. Its vapor density is equal to its empirical formula weight. Determine its molecular formula.

Identify the term or substance based on the descriptions given below:

The property by virtue of which the compound has the same molecular formula but different structural formulae.