Science – Metals and Non Metals Long Answer Type Questions Q.1) You are given a hammer, a battery, a bulb, wires and a switch. (a) How could you use them to distinguish between samples of metals and non-metals? (b) Assess the usefulness of these tests in distinguishing between metals and non-metals. Ans) Q.2) State two […]
Science – Metals and Non Metals Short Answer Type Questions Q.1) Explain the meanings of “malleable” and “ductile.” Ans) Malleable – Substances that can be beaten into thin sheets are called malleable. For example, most of the metals are malleable, gold and silver are the most malleable metals. This property is called malleability. Ductile –
Science – Metals and Non Metals Very Short Answer Type Questions Q.1) Give an example of a metal which: (i). Is a liquid at room temperature. (ii). Can be easily cut with a knife. (iii). Is the best conductor of heat. (iv). Is a poor conductor of heat. Ans) (i) Mercury, (ii) Sodium, (iii) Silver
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Science – Acids, Bases and Salts Long Answer Type Questions Q.1) What is the chemical name of Bleaching powder? How is it prepared? List its uses. Ans) Chemical name of bleaching powder is calcium oxychloride with chemical formula CaOCl₂. Preparation – It is prepared by passing chlorine gas through dry slaked lime [Ca(OH)₂] Ca(OH)₂ +
Science – Acids, Bases and Salts Short Answer Type Questions Q.1) Why should curd and sour substances not be kept in brass and copper vessels? Ans) Curd and other sour substances contain acids. Therefore, when they are kept in brass and copper vessels, the metal reacts with the acid to liberate hydrogen gas and harmful
Science – Acids, Bases and Salts Very Short Answer Type Questions Q.1) Why does an aqueous solution of an acid conduct electricity? Ans) The presence of hydrogen ions (H) or hydronium ions (H₃O) in the aqueous solution of an acid are responsible for conducting electricity. Q.2) Why does dry HCl gas not change the colour
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Science – Chemical Reaction and Equations Long Answer Type Questions Q.1) Explain the following terms on gain or loss of oxygen with two examples each: (a) Oxidation, (b) Reduction. Ans) (a) Oxidation – A chemical reaction in which gain of oxygen or loss of hydrogen takes place is called oxidation reaction and the process is
Science – Chemical Reaction and Equations Short Answer Type Questions Q.1) Why should a magnesium ribbon be cleaned before it is burnt in air? Ans) Magnesium is a very reactive metal. When stored, it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide is quite stable
Science – Chemical Reaction and Equations Very Short Answer Type Questions Q.1) Write the balanced equation for the following chemical reactions: (i) Hydrogen + Chlorine → Hydrogen chloride Ans) H₂(g) + Cl₂ (g) → 2HCl(g) (ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride Ans) 3BaCl₂(s)+ Al₂(SO4)3(s) → 3BaSO4(s) + 2AlCl3(s) (iii)
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Economics- Consumer Rights Long Answer Type Questions Q.1) What factors gave birth to the consumer movement in India? Trace its evolution. Ans) Consumer Movement in India– The consumer movement started due to consumer dissatisfaction. There were many reasons for consumer dissatisfaction, such as, shortage of food items, hoarding, black marketing, adulteration etc. To deal with
