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Acids, Base and Salts NCERT Solutions Exercises A solution turns red litmus blue, its pH is likely to be (a) 1(b) 4(c) 5(d) 10 (d) 10 A solution reacts with crushed-egg shells to give a gas that turns lime water milky. The solution contains (a) NaCl(b) HCl(c) LiCl(d) KCl (b) HCl 10 mL of a […]

Chemical Reactions and Equations NCERT Solutions Exercises Which of the statements about the reaction below are incorrect ?2 PbO(s) + C(s) → 2Pb (s) + CO2(g)(a) Lead is getting reduced.(b) Carbon dioxide is getting oxidised.(c) Carbon is getting oxidised.(d) Lead oxide is getting reduced. (i) (a) and (b)(ii) (a) and (c)(iii) (a), (b) and (c)(iv)

Light – Reflection and Refraction What Makes thing visible? Reflection of light helps us to see objects. The object that we see reflects the light falls on it. This reflected light reaches our eye, and we can see the object. Reflection of Light Behavior of reflected light can be studied using Laws of Reflection. Laws

Electricity Electric Current and Circuits Electric Current: It is the amount of charge flowing through an area in unit time or it is the rate of flow of electric charges. Electric current is the flow of electrons from one end to another. Direction of electric current is taken opposite to the direction of flow of

MAGNETIC EFFECTS OF ELECTRIC CURRENT Magnetic Field and Field Lines The region around the magnet where the force of the magnet can be detected is called the magnetic field. It is a vector quantity i.e., it has both magnitude and direction. Magnetic field lines These are imaginary lines around the magnet that represent the magnetic field.

The Human Eye and the Colourful World The Human Eye When you visit a beautiful hill station, beach, or even a garden, you are amazed by the beauty of these places. It is possible only because of our eyes. The human eyes are one of the most important sense organs. Our eyes consist of a

HOW DO ORGANISMS REPRODUCE? Have you wondered what would have happened if organisms never reproduced? Then we would not have existed in this world right!! Reproduction is an essential process that helps in the survival of species on earth. We will learn the different types of reproduction that occur in plants and animals. There are

Control and Coordination Animals – Nervous System Each nerve cell in your body makes up the nervous system. Communication with the outside world and many body functions are controlled by the nervous system. Nervous system is responsible for controlling our movements, thoughts. It also helps you to respond to the world around you. Nerve impulses

CARBON AND IT’S COMPOUNDS Bonding in Carbon Now that you know how crucial carbon is for human survival on our planet, let’s look at the features of carbon compounds. They are poor conductors of electricity. Low Melting point and Boiling point gives us the conclusion that the force of attraction between the molecules is weak.

Life Processes The essential activities performed by an organism for the maintenance of the body are called life processes. These are the 7 processes all living things do – movement, reproduction, sensitivity, nutrition, excretion, respiration, and growth. Nutrition: It is the process of intake of food to gain energy and nutrients for the body. Life