Test: Metals & Non-metals

Carbon, in the form of Graphite is a good conductor of electricity. It conducts heat and electricity like a metal or a metalloid.

The metal which exist as a liquid at room temperature is mercury. Non - metal which exist as a liquid at room temperature is bromine. 

In the neutral atom of an element,

Sodium metal reacts vigorously with oxygen and water. 

Calcium hydroxide Ca ( OH) 2 ,  has calcium  ( Ca) which is a metal.

Malleability: The property of metals by which they can be beaten into thin sheets is known as malleability.
For example, silver metal is beaten to make silver foil used for decorating sweets.

The method used to extract metals from the ore in which they are found depends on their reactivity.
For example, reactive metals such as aluminium are extracted by electrolysis, while a less-reactive metal such as iron may be extracted by reduction with carbon or carbon monoxide.

Copper doesn't react with dilute sulphuric acid, Liberating hydrogen because copper is lower in the electromotive series than hydrogen. A more reactive element can displace a less reactive element from its salt solution.

Silver  do not react with oxygen even at high temperatures as they are less reactive and are placed below the reactivity series. Hence they are called noble metals. But silver fades after some months or years due to its tendency to react with sulphur in air forming their sulphides

Calcination is a process of heating ore in the absence of air to a high temperature but insufficient to melt the ore. Generally, carbonated and hydrated ores are calcined.

When metal A is dipped in a solution of salt of metal V, then metal B is displaced, this shows that metal A is more reactive than B. Only then it can displace B from its salt solution. 

When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore, copper sulphate solution colour changes from blue to light green .

Sulfur dioxide gas turns moist litmus paper from blue to red and moist universal indicator paper to red - it is acidic.

Non - metals generally form acidic oxides but oxides of carbon and nitrogen are neutral in nature like CO and NO.

A is the correct option.Metals lose electrons in bonding whilst non-metals gain electrons during ionic bonding hence metals form cations and non-metals form anions.

Lead being metal is a bad conductor of electricity and heat. Compared to other metals, lead is a poor conductor of heat while gold, silver, platinum are good conductors of heat.

There is lot of empty space on the unit cell, hence metallic bond is weaker. Thus sodium and potassium appear soft and can with knife. 

Metals that are less reactive than H are:- * Copper (Cu) * Mercury (Hg) * Silver (Ag) * Platinum(Pt) * Gold (Au)

The most abundant Element on the earth's crust is oxygen followed by silicon.. But both of them are Non-metals. But, silicon is followed by Aluminium which is a METAL (about 8.23%) further followed by iron. So the most abundant metal found on the Earth is Aluminium.

Iron is the second most abundant Metal in the earth's crust. It is found in the molten form inside the crust of the earth. In the presence of air and moisture, it forms it's oxide but the alloy of steel is widely used as pipes, it is unreactive in nature.