(a) List in tabular form three chemical properties on the basis of which we can differentiate between a metal and a non-metal. (b) Give reasons for the following: (i) Most metals conduct electricity well. (ii) The reaction of iron (III) oxide `[Fe_(2)O_(3)]` with heated aluminium is used to join cracked machine parts.
Text Solution
Verified by Experts
(a) n/a. (b) (i) Most metals allow the current to pass from one end to the other due to the movement of walence electrons present in it. (ii) This displacement reaction is highly exothermic. The amonut of heat evolved is so large that the metals are produced in the molten state and is thus used to join cracked machine parts and it is known as thermit reaction.
|
Topper's Solved these Questions
X BOARDS
X BOARDS|Exercise SET-I SECTION-E|5 Videos
X BOARDS
X BOARDS|Exercise SET-II SECTION-B|2 Videos
X BOARDS
X BOARDS|Exercise SET-I SECTION-C|4 Videos
QUESTION PAPER 2023
X BOARDS|Exercise Question|24 Videos
Similar Questions
Explore conceptually related problems
Give reasons for the following: The reaction of iron (III) oxide [Fe_(2)O_(3)] with heated aluminium is used to join cracked machine parts.
List in tabular form any three chemical on the basis of which metals and non-metals are differentiated. State two ways to prevent the rusting of iron.
(a) Describe an activity to show that metals are good conductors of electricity. (b) Account for the following: (i) Hydrogen gas is not evolved when a metal reacts with nitric acid. (ii) For storing sodium metal, it is kept immersed in kerosene. (iii) The reaction of iron (III) oxide with aluminium is used to join cracked iron part machines.
Write a balanced chemical equation with state symbols for the following reaction: Heated iron metal reacts with steam to from iron (II, III) oxide, (Fe_(3)O_(4)) and hydrogen.
Give reasons for the following: (i) Transition metals form alloys. (ii) Mn_2O_3 is basic whereas Mn_2O_7 is acidic. (iii) Eu^(2+) is a strong reducing agent.
Give reasons for the following: (i) Zinc oxide is considered an amphoteric oxide. (ii) Non-metals in general do not displace hydrogen from dilute acids. (iii) Metals conduct electricity.
Give names of the following metals : (i) The best conductor of electricity (ii) The metal used for preventing rusting of iron (i) A metal which can be cut with a knife (iv) A metal which is present in the blood
(a). State any three differences between the physical properties of metals and non-metals. (b). Differentiate between metals and non-metals on the basis of their chemical properties. (c). State three reasons (of which at least one must be chemical) for believing that sodium is a metal. (d). State three reasons (of which at least one must be chemical) for believing that sulphur is a non-metal. (e). Which non-metal has been placed int he reactivity series of metals.
(a) Compare the properties of a typical metal and a non-metal on the basis of the following: (i) Nature of the oxide formed by them. (ii) Conductivity. (b) Name a non-metal which is lustrous and a metal which is liquid at room temperature.
State reasons for the following : (i) Aluminium oxide is called an amphoteric oxide. (ii) Hydrogen gas is not evolved when most metals react with nitric acid. (iii) Nitrogen is used to preserve food.
