The metal oxides which react with both acid as well as base to form salt and water are known as amphoteric oxide
For example ammonium oxide reacts with both acids and bases forming aluminium trichloride and sodium aluminate when react with acid and bases respectively
Que 14
What is anodising
Ans
Anodising is a process of forming a thick oxide layer of aluminium Aluminium develops a thin oxide layer when exposed to air aluminium oxide coat makes it resistant to further corrosion
Que 15
What is reactivity series
Ans
Activity series a list of metals arranged in the order of their decreasing activities
Watch the attach lecture in order to understand the reactivity series and the different numericals and tricks based on reactivity series
to join railway tracks or cracked machine parts is known as thermit reactions
Que 23
During the process of electrolysis on which electrode the pure metal is collected and on which electrode impurities are collected
Ans
During the process of electrolysis
The pure metal is collected at the cathode
The impure metal is collected at the anode
Que 24
What chemical process is used for obtaining a metal from its oxide
Ans
The process by which we obtain a metal is known as electrolytic refining
Que 25
Name two metals which are found in nature in the free state
Ans
Gold ,Silver
Que 26
Name the the process by which we extract the metals from their ores
Ans
Extraction of metals from their oaths and then refining them for use is known as metallurgy
Que 27
What is corrosion
Ans
The surface of some metals when exposed to moist air for a long period of time get screwed it this is known as corrosion
For example
in case of silver they become black when exposed to air forming silver sulphide
Copper reacts with moist carbon dioxide and gains a green coat forming copper carbonate
Iron when exposed to moist air forms a coating of brownie flake called rust
Que 28
How we prevent element from the corrosion
Ans
We prevent corrosion by
Painting ,oiling , galvanizing ,anodising
Que 29
What is galvanization
Ans
The method of protecting steel and iron from rusting by coating them with a thin layer of zinc is known as galvanization
Que 30
What is alloy
Ans
It is a homogeneous mixture of two or more metals or a metal and a non metal
Que 31
Give the composition of alloys
Ans
Amalgam
Amalgam is the alloy of Mercury
Brass
Brass is the alloy of copper and zinc
Bronze
Ranches the alloy of copper and tin
Solder
Solder is the alloy of lead and tin
Very Short Answers --
Que - What is full form of TNT?
Ans - TNT -- Tri Nitro Toluene
Que --Name nonmetal used in vulcanisation of rubber ?
Ans -- Sulphur
Que --Name one metal and one nonmetal exists in liquid state ?
Ans -- Metal which exists in liquid state is mercury
Non metal which exists in liquid state is bromine
Que -- Name the metal which is used as rocket fuel ?
Ans -- Liquid Hydrogen is used as a rocket fuel
Que --Name the metal used in making bullet proof jackets?
Ans -- Zirconium
Que -- Name the metal used in car batteries?
Ans -- Lead
SAMPLE PAPER For Metal And Non Metal
Section A
Short Answer---
Que-- Define and give one example
a) Malleability
b) Ductility
c) Amphoteric Oxides
Que - Differentiate the following ( at least two points)
a) Metals and Non Metals
b) Acidic and Basic Oxides
Que - What is reactivity series of metal ?
a) Name most reactive metal
b) Name least reactive metal
Section 2 --
Give Reasons for the following --
a) Why is sodium kept in kerosene oil?
b) Platinum ,gold is used to make jewellery
c) Aluminium is used to make utensils for cooking
d) Why sulphur dioxide gas has no action on dry litmus but changes colour of moist litmus
Section 3 --
Que -- Write equation for the following --
a) Iron with steam
b) Iron with sulphuric acid
Que -- Which of the following give displacement reactions or not and why ?
a) MgCl2 with Aluminium metal
b) AgNO3 with copper metal
