English Medium Class 9 - CBSE Question Bank Solutions

The atomic theory of matter was proposed by :

Which of the following statement is always correct?

The law of constant proportions was given by :

In water, the proportion of oxygen and hydrogen by mass is :

In an experiment, 4.90 g of copper oxide was obtained from 3.92 g of copper. In another experiment, 4.55 g of copper oxide gave, on reduction, 3.64 g of copper. Show with the help of calculations that these figures verify the law of constant proportions.

When 5 g of calcium is burnt in 2 g of oxygen, then 7 g of calcium oxide is produced. What mass of calcium oxide will be produced when 5 g of calcium is burnt in 20 g of oxygen ? Which law of chemical combination will govern your answer ?

What do we call those particles which have more or less electrons than the normal atoms ?

What do we call those particles which have more electrons than the normal atoms ?

What do we call those particles which have less electrons than the normal atoms ?

What do we call those particles which are formed by the gain of electrons by atoms ?

What do we call those particles which are formed by the loss of electrons by atoms ?

Work out the formulae for the following compounds :

Sodium oxide

Work out the formulae for the following compounds:

Calcium carbonate

What is the physical state of water at 25°C. 

Find out incorrect sentence

Girth of stem increases due to

Which cell does not have perforated cell wall?

A person met with an accident in which two long bones of hand were dislocated. Which among the following may be the possible reason?

Meristematic tissues in plants are

Cartilage is not found in