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STD 5 Science set 4

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1) What is the percentage of the hydrogen by weight on the earth ?

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2) The most abundant element in the sun,the stars and the universe is

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3) Who discovered hydrogen?

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4) Haber process is -

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5) Which of the following metal is liquid at room temperature?

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6) Smallest particle of an element which can take part in any chemical change is known as a/an ______

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7) Which of the following is used as a rocket propellant?

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8) Which of the following is used to prepare hydrogen in the laboratory?

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9) Molecular formula of calcium oxide is _______

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10) Food is burnt with the help of ______ to produce energy.

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11) Burning of glucose in the presence of oxygen to produce carbon dioxide,water and energy is -

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12) _____ is the most abundant element in the earth's crust?

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13) which of the following is used to prepare oxygen?

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14) ______ named hydrogen as 'inflammable air'.

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15) Which of the following is released during respiration?

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16) Which of the following is a non-metal ?

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17) Which of the following is not an example of metalloid?

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18) Rusting is the process of forming rust on ______?

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19) Which of the following metals burns in oxygen with a dazzling light ?

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20) Which of the following elements is a non metal but a good conductor of heat and electricity?

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21) Food is burnt with the help of ______ to produce energy.

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22) All noble gases are _______.

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23) Symbol of Silver is _____.

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24) What is another name of the noble gases?

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25) The word which means 'maker of water' is

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