English Medium इयत्ता ९ - CBSE Question Bank Solutions

Classify each of the following on the basis of their atomicity.

1. F₂
2. NO₂
3. N₂O
4. C₂H₆
5. P₄
6. H₂O₂
7. P₄O₁₀
8. O₃
9. HCl
10. CH₄
11. He
12. Ag

Which has more number of atoms?

100g of N₂ or 100 g of NH₃

A gold sample contains 90% of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold?

Compute the difference in masses of one mole each of aluminium atoms and one mole of its ions. (Mass of an electron is 9.1×10^–28 g). Which one is heavier?

A silver ornament of mass ‘m’ gram is polished with gold equivalent to 1% of the mass of silver. Compute the ratio of the number of atoms of gold and silver in the ornament.

. A sample of ethane (C₂H₆) gas has the same mass as 1.5 ×1020 molecules of methane (CH₄). How many C₂H₆ molecules does the sample of gas contain?

In the atom of an element X, 6 electrons are present in the outermost shell. If it acquires noble gas configuration by accepting requisite number of electrons, then what would be the charge on the ion so formed?

Match the names of the Scientists given in column A with their contributions towards the understanding of the atomic structure as given in column B

The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?

Helium atom has 2 electrons in its valence shell but its valency is not 2, Explain

An element X has a mass number 4 and atomic number 2. Write the valency of this element?

Draw a neat labelled diagram of an animal cell

Draw a neat diagram of plant cell and label any three parts which differentiate it from animal cell.

Real organs are absent in

Define the terms and give one example

Coelom

Name the process associated with the following

A fine beam of light entering through a small hole in a dark room illuminates the particles in its paths.

An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess?

Give an example of each mixture having the following characteristics. Suggest a suitable method to separate the components of this mixture

Two or more coloured constituents are soluble in some solvent.

Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

Name a non-metal other than carbon that shows allotropy.

Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

Name a non-metal which is required for combustion.