STD 5 Science set 4
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1) Molecular formula of calcium oxide is _______
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2) _____ is the most abundant element in the earth's crust?
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3) What is the percentage of the hydrogen by weight on the earth ?
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4) which of the following is used to prepare oxygen?
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5) Burning of glucose in the presence of oxygen to produce carbon dioxide,water and energy is -
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6) Which of the following is used as a rocket propellant?
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7) Which of the following metals burns in oxygen with a dazzling light ?
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8) Which of the following is used to prepare hydrogen in the laboratory?
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9) All noble gases are _______.
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10) Smallest particle of an element which can take part in any chemical change is known as a/an ______
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11) Food is burnt with the help of ______ to produce energy.
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12) Which of the following metal is liquid at room temperature?
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13) Which of the following is a non-metal ?
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14) Food is burnt with the help of ______ to produce energy.
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15) Symbol of Silver is _____.
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16) Which of the following elements is a non metal but a good conductor of heat and electricity?
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17) What is another name of the noble gases?
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18) Who discovered hydrogen?
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19) Rusting is the process of forming rust on ______?
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20) Which of the following is released during respiration?
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21) ______ named hydrogen as 'inflammable air'.
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22) The word which means 'maker of water' is
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23) The most abundant element in the sun,the stars and the universe is
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24) Which of the following is not an example of metalloid?
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25) Haber process is -
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