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Petroleum is:

The images given below are the different sources of _______ fibres.

Which types of impurities are removed by boiling the water?

A polymer is a large molecule composed of many repeated units. What is a polyester composed of?

Which of the following metals do not start an explosion on reaction with water?

A drum full of kerosene catches fire. What is the simplest way to put off this fire ?

Why do protons don't move?

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Distinguish between

1 absorption and conduction

2 role of humidity and wind on the rate of transpiration

The process by which matter in solid state changes to a gaseous state, due to an increase in temperature and/or decrease in pressure is called as ______________.

What is handpicking method of separation? Write two mixtures that can be separated by handpicking.

Match the following:
$\begin{array}{cccc}\text{(i)}& \text{Water}& \text{(A)}& \text{Compound}\\ \text{(ii)}& \text{Hydrogen}& \text{(B)}& \text{Element}\\ \text{(iii)}& \text{Salt}& & \\ \text{(iv)}& \text{Gold}& & \\ \text{(v)}& \text{Carbon dioxide}& & \\ \text{(vi)}& \text{Iron}& & \end{array}$
The correct pairs are:

Write the law which explains the solubility of gases.

How do the gases exert pressure?

Gas is found to contain 2.34 gm of nitrogen and 5.34 gm of oxygen. simplest formula of the compound is1. $N_2{O}_2$, $N{O}_3$, $N_2{O}_3$, $N{O}_2$

Which amongst the following is the purest form of charcoal?

are gases also considered as fluids

Which of the following air pollutant is capable of preventing photosynthesis in plants?

(a) CFCs

(b) nitrogen oxide

(c) dust

(d) carbon monoxide

In the decomposition of lead (II) nitrate to give lead (II) oxide, nitrogen dioxide and oxygen gas, the coefficient of nitrogen dioxide (in the balanced equation) is:

(All coefficients being natural numbers)

The ___ is a tabular arrangement of all the existing elements.

What is plastic cookware

What are the different ways in which water gets contaminated? [5 MARKS]

Which of the following separation techniques use the difference in the size of particles to separate them?

What is the meaning of the term monomers

The usage of LPG in rural areas should be promoted because

After a science lesson on 'Man-made materials', a class of pupils grouped as P, Q, R, and S made the following statements about recycling.



P- Recycling reduces pollution.

Q- Recycling makes the environment unfit for living things.

R- Recycling helps to conserve energy.

S- Recycling results in wastage of natural resources.



Which groups have made the correct statements?

A non-metal which supports the process of combustion in factories and industries is:

Consider the following chemical equation for the combustion of methane ($C{H}_4$)

$C{H}_4+2O_2\to C{O}_2+2H_{2}O$

Which of the following is a suitable method of removing hardness from water?

Al + HCl -