Fill in the blanks with suitable words:
(a) The addition of oxygen to a substance is called _______ whereas removal of oxygen is called ________.
(b) The addition of hydrogen to a substance is called _______ whereas removal of hydrogen is called ________.
(c) Anti-oxidants are often added to fat containing food to prevent _________ due to oxidation.
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(a) The addition of oxygen to a substance is called oxidation whereas removal of oxygen is called reduction.
(b) The addition of hydrogen to a substance is called reduction whereas removal of hydrogen is called oxidation.
(c) Anti-oxidants are often added to fat containing food to prevent rancidity due to oxidation.
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- The removal of oxygen from a substance is called:(a) oxidation (b) corrosion (c) reduction (d) rancidity
- A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance?Iron nailGlassStone pieceWood
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- Polyester is a long-chain polymer of a chemical substance called-
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- Why is mixture called an impure substance?
- Fill in the blanks using the words given in the box. ignition, petrol, combustion, calorific value, combustible, inflammable(a) A chemical process in which a substance reacts with oxygen to give off heat is called ………………(b) Wood, paper, CNG are ……………substances.(c) The lowest temperature at which a substance catches fire is called its …………… temperature.(d) Ignition temperature of……………… is lower than that of wood.(e) The substances which have very low……………… temperature and can easily catch fire with a flame are called…………….. substances.(f) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its …………….
- The element which is not common between the compounds called baking soda and soda ash is(a) sodium (b) hydrogen(c) oxygen (d) carbon
- In the context of redox reactions, the removal of hydrogen from a substance is known as:(a) oxidation (b) dehydration (c) reduction (d) dehydrogenation
- The removal of feces through the anus from time to time is called(a) rumination(b) micturition(c) ingestion(d) egestion
- Fill in the following blanks with suitable words :(a) An element is made up of only one kind of ........................(b) Brine is a ........................ whereas alcohol is a ........................(c) Brass is an alloy which is considered a ............................(d) The three important metalloids are ................., .................. and ...................(e) The elements which are sonorous are called ..........................
- Fill in the following blanks with suitable words:(a) Decomposer organisms are ____________ in their action.(b) In nature, all green plants are _____________ whereas animals are consumers.(c) A series of organisms, each of which feeds on the next organism, the beginning of which is a green plant, is called a ____________(d) The science that deals with the inter-relationships of living things with one another and their environment is called _____________(e) Plastic is a _____________ material whereas paper is a ______________ material.
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