SCIENCE AND TECHNOLOGY

STANDARD TEN PART I & II CHAPTER : 7 Metals and Non-Metals
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SCIENCE AND TECHNOLOGY – Chapter 7

Metals and Non-Metals

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An element X is soft and can be cut with the help of a knife. It is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following:

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Which of the following alloys contains a non-metal as one of its constituents?

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Galvanisation is a method of protecting steel and iron from rusting by coating them with a thin layer of

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Which of the following pairs of reactants will go undergo a displacement reaction?

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Which among the following is the most abundant metal found in the earth’s crust?

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Which of the following pairs will give displacement reactions?

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An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be

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Which of the following represent the correct order of decreasing reactivity?

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In the given reaction, Al2O3 + NaOH → ……X…… + H2O
What is element X?

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In electrolytic refining, the cathode is made up of

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The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as

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The metal which is liquid at room temperature is

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Bauxite is an ore of

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The number of protons in an atom of an element A is 19 then, the number of electron in its ion A+ is:

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The non-metal which is liquid at room temperature is:

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