English Medium Class 9 - CBSE Question Bank Solutions for Science

Name the process associated with the following

Dry ice is kept at room temperature and at one atmospheric pressure.

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

The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope.

Iron filings and sulphur were mixed together and divided into two parts, ‘A’ and ‘B’. Part ‘A’ was heated strongly while Part ‘B’ was not heated. Dilute hydrochloric acid was added to both Parts and evolution of gas was seen in both cases. How will you identify the gases that evolved?

Define the term Cell inclusions.

What is the Location of Following in the Cell : Tonoplast

1 µm is

Why do plant cells possess large sized vacuole?

Identify a member of porifera

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 known to form the largest number of compounds.

Which of the following are not compounds?

1. Chlorine gas
2. Potassium chloride
3. Iron
4. Iron sulphide
5. Aluminium
6. Iodine
7. Carbon
8. Carbon monoxide
9. Sulphur powder

An element has an atomic number of 11 and its mass number is 23. What is the arrangement of electrons in the shells? State nuclear composition of an atom of the element.

If the number of electrons in an ion Z3– is 10, the atomic number of element Z will be :

The atomic number of an element E is 16. The number of electrons in its ion E2– will be :

The number of electrons in an ion Y2+ is 10. The atomic number of element Y is most likely to be :

The atom of an element X contains 17 protons, 17 electrons and 18 neutrons whereas the atom of an element Y contains 11 protons, 11 electrons and 12 neutrons.

1. What type of ion will be formed by an atom of element X ? Write the symbol of ion formed.
2. What will be the number of (i) protons (ii) electrons, and (iii) neutrons, in the ion formed from X ?
3. What type of ion will be formed by an atom of element Y ? Write the symbol of ion formed.
4. What will be the number of (i) protons (ii) electrons, and (iii) neutrons, in the ion formed from Y ?
5. What is the atomic mass of (i) X, and (ii) Y ?
6. What could the elements X and Y be ?

What is the numerical value of Avogadro number ?

What name is given to the number 6.022 × 1023 ?

What name is given to this number ?

What is the number of molecules in 1.5 moles of ammonia ?

Calculate the number of molecules in 4 g of oxygen.