Advertisements
Advertisements
प्रश्न
Which one of the following is not a metalloid ?
विकल्प
boron
silicon
gallium
germanium
Advertisements
उत्तर
gallium
Boron, silicon and germanium are metalloids. Gallium is a metal.
APPEARS IN
संबंधित प्रश्न
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
Liquids have definite volume but do not have definite shape.
Differentiate between an atom and a molecule.
Define the following term of Matter .
What is the other name for impure substances ? Give two examples of impure substances.
Name a metal which has no fixed shape.
Draw a flow-chart for the schematic representation of different types of matter.
A, B and C are all liquids. Liquid A has a comparatively low boiling point. On heating, liquid A vaporises completely without leaving behind any residue. Liquid A is being used increasingly as a fuel in motor vehicles either alone or by mixing with petrol. Liquid B has a very high boiling point. It also vaporises completely on heating, without leaving any residue. Liquid B is a conductor of electricity and used in making thermometers. Liquid C has a moderate boiling point. On heating, liquid C vaporises leaving behind a white solid D which is used in cooking vegetables. The condensation of vapours from C give a liquid E which turns anhydrous CuSO4 to blue.
(a) Which liquid could be an element ? Name this element.
(b) Which liquid could be a mixture ? Name this mixture.
(c) Which liquid could be a compound ? Name this compound.
(d) What could the solid D be ?
(e) What do you think is liquid E ?
How much water should be mixed with 12 mL of alcohol so as to obtain 12 % alcohol solution ?
State whether the following statement is true or false :
Sponge is an example of solid sol.
Choose one term from the following which includes the other three :
aerosol, emulsion, colloid, sol
How will you differentiate between a suspension and a colloid ?
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
Name the source from which nitrogen and oxygen are obtained on a large scale.
Explain the meaning of the term matter with special reference to the term ‘substance’.
Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?
The physical state of water at 373 K is ______.
Evaporation does form bubbles.
Define the term matter.
