Advertisements
Advertisements
प्रश्न
What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
Advertisements
उत्तर
- Metals: Metals are elements that are malleable, ductile and conduct electricity.
Examples: Aluminum and zinc - Non-metals: Non-metals are elements that are neither malleable nor ductile, and they do not conduct electricity. Most non-metals are brittle in nature.
Examples: Phosphorus, hydrogen - Metalloids: Metalloids are elements that show properties of both metals and non metals.
Examples: Germanium, silicon
APPEARS IN
संबंधित प्रश्न
Define matter.
Fill in the blank
All matter is made up of tiny particles called ______
Name the property which enables metals to be drawn into wires.
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
Which of the two will scatter light : soap solution or sugar solution ? Why ?
State whether colloidal solutions are homogeneous or heterogeneous.
What will happen if a saturated solution is :
- heated
- cooled
Which of the following do not exhibit Tyndall effect ?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
Milk of Magnesia is :
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
Name the process which can be used to recover salt from an aqueous salt solution.
How would you separate iodine from a mixture of iodine and common salt ?
What is chromatography ? State its two applications.
The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is :
The liquid air has three components X, Y and Z whose boiling points are : –186°C, –183°C and –196°C,
respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed
up slowly :
(a) Which component will be collected from near the bottom of the fraction distillation column ? Why ?
(b) Which component will be collected from the top part of the fractional distillation column ? Why ?
(c) Which component will be collected from the middle part of the fractional distillation column ? Why ?
(d) What could the component X, Y and Z be ?
Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
Define the term matter.
