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Q 1.
Germanium, Boron and Silicon are?
Ans.
Metalloids.
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Q 2.
Rusting of Almira is a?
Ans.
Chemical change.
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Q 3.
Burning of candle is a?
Ans.
Both physical and chemical change.
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Q 4.
Which gas is filled in packets of chips?
Ans.
Nitrogen.
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Q 5.
Which gas is contained by coke and soda?
Ans.
Carbon dioxide.
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Q 6.
Tincture of iodine is a solution of iodine and?
Ans.
Alcohol.
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Q 7.
A homogeneous mixture of two or more substances is called?
Ans.
Solution.
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Q 8.
Mixtures of two or more metals is called?
Ans.
Alloys.
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Q 9.
Air is a mixture of 21% oxygen and -- of nitrogen?
Ans.
78%
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Q 10.
Name the process by which Dye is obtained from blue/ black ink by?
Ans.
Evaporation
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Q 11.
Name the process used for extraction if iron from its ore?
Ans.
Separating funnel.
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Q 12.
What is the boiling point of water?
Ans.
-183°C.
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Q 13.
Which technique is used to separate drugs from blood, pigments from natural colors?
Ans.
Chromatography.
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Q 14.
Crystallisation method is used to purify?
Ans.
Solid.
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Q 15.
Name the technique can we obtain pure copper sulphate from an impure metal?
Ans.
Crystallisation
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Q 16.
Dissolving salt in water is a?
Ans.
Physical change.
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Q 17.
There are 92 elements which are naturally occurring how many elements are man made?
Ans.
26.
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Q 18.
Name the metals which has in liquids state at room temperature?
Ans.
Mercury.
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Q 19.
Name the process used to separate butter and curd?
Ans.
Centrifugation.
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Q 20.
How many parts elements can be divided?
Ans.
1.Non-metal
2.Metals 3.Metalloids. |