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PAGE NO :113 Solution 1: Solution 2: Solution 3: (a) Mass of an atom – Protons and neutrons (b) Size of an atom – Electrons Solution 4: Three fundamental particles of an atom are- Proton Electron...
PAGE NO :96 Solution 1: The molecular formula of water is H 2 O, this shows that water is not an element but it is a compound made up of two elements hydrogen and oxygen combined in a fixed ratio,...
PAGE NO :74 Solution 1: A physical change is a temporary change in which no new substance is formed and the composition or identity of the substance is not altered although certain specific physical...
PAGE NO :56 Solution 1: Symbol – It is the short form or abbreviation used for the name of an element. It represents one atom of that element. Formula – Formula of a compound represents the...
PAGE NO :41 Solution 1: Elements: An element is a pure substance which can neither be broken down into simpler substances nor formed from two or more simpler substances by any known physical or...
PAGE NO :21 Solution 1: An ideal gas can be characterized by three state variables: Absolute pressure (P), Volume (V), and Absolute temperature (T). Solution 2: Solution 3: Solution 4: Solution 5:...
PAGE NO :8 Solution 1: Matter is anything around us which occupies space and has mass. Example- Coal, Copper, Water, Oxygen, Kerosene Key: Matter occupies space and has mass. Solution 2: The...
PAGE NO: 323 Solution 1: Positive and negative are the two kind of charges. Solution 2: Net charge on an atom is zero. Solution 3: 10 is the number of electrons present in Na + . Solution 4: An atom...
PAGE NO: 320 Solution 1: Natural magnet is the deposits of the iron ore which has the attracting property of iron The properties of natural magnet are : The magnet has the directive property, when it...
PAGE NO: 312 Solution 1: The flow of electrons in a particular direction in a conductor is called an electric current. Solution 2: An electric cell is the source of electric current in which chemical...
PAGE NO: 300 Solution 1: Electrostatics is defined as the study of charges at rest. Solution 2: Frictional electricity is also known as static electricity. Solution 3: Thales of Miletus was the...
PAGE NO: 286 Solution 1: Yes, we can hear in the dark room. Solution 2: Sound is produced by the vibrating objects. Solution 3: Yes, sound is a form of energy. Solution 4: No, sound cannot travel...