CBSE Questions for Class 8 Chemistry Materials Metals And Non Metals Quiz 6 - MCQExams.com

Electric wires, coils, and machines are made of metals. Which of the following metal cannot be used for them?
  • copper
  • silver
  • iron
  • sodium
Select the objects from the following which have a characteristic shine known as lustre   _____________.
  • wooden bowls.
  • towel and toys.
  • shirts and scarfs.
  • brass utensils.
The density of non metals is _____ when compared with metals.
  • high
  • same
  • low
  • none of the above
A metal $$X$$ reacts with water to produce a highly combustible gas $$Y$$, and a solution $$Z$$. Another metal $$P$$ reacts with $$Z$$ to give the same gas $$Y$$. $$X,\ Y,\ Z$$ and $$P$$ respectively are:
  • $$Zn, H_2, Zn(OH)_2, Al$$
  • $$Na, H_2,NaOH, Zn$$
  • $$K, H_2, KOH, Al$$
  • $$Li, H_2, LiOH, K$$
The Statue of Liberty is green because of
  • green stone
  • oxidized brass
  • steel painted green
  • oxidized copper
Metals are sonorous.
  • True
  • False
Consider the following statements
$$1$$. Most of the metal oxides are insoluble in water.
$$2$$. Sodium oxide and potasium oxide are metal oxides and hence insoluble in water.
The correct answer is?
  • Only $$1$$ is true
  • Only $$2$$ is true
  • $$1$$ and $$2$$ both are true
  • Neither of the two is true
The important metal used with iron to produce stainless steel is:
  • Carbon
  • Tin
  • Chromium
  • Aluminium
Metals generally reacts with dilute acids to produce a gas which burns with a 'pop' sound.
  • True
  • False
Which one of the following statement, about glass is not correct ?
  • Glass is often said to be a supercooled liquid.
  • Glass has no definite melting point.
  • Soda glass is harder than pyrex glass.
  • Boron is present in pyrex glass.
Which of the following metals corrodes readily in moist air? 
  • Gold
  • Silver
  • Nickel
  • Iron
Which of the following element does not occur in liquid state?
  • $$Hg$$
  • $$Li$$
  • $$Ga$$
  • $$Cs$$
When metallic copper comes in contact with moisture, a green powdery/pasty coating can be seen over it. This is chemically known as
  • Copper sulphide - Copper carbonate
  • Copper carbonate - Copper sulphate
  • Copper carbonate - Copper hydroxide
  • Copper Sulphate - Copper sulphide
Non-metals are lustrous and good conductors of heat and electricity.
  • True
  • False
Which of the following is not a metal?
  • copper
  • aluminium
  • sulphur
  • iron
Amit has learned that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a non-metal?
  • iron nail
  • copper plate
  • aluminium wire
  • piece of coal
The substance that will be flattened on beating with a hammer is:
  • crystal of iodine
  • piece of coal
  • lump of sulphur
  • zinc granule
Metals generally react with dilute acids to produce hydrogen gas . Which one of the following metals does not react with dilute hydrochloric acid?
  • magnesium
  • iron
  • aluminium
  • copper
Generally, metals are solid. Which one of the following metals is found in a liquid state at room temperature?
  • $$Na$$
  • $$Fe$$
  • $$Cr$$
  • $$Hg$$
Oxides of non-metals are acidic in nature. True or False
  • True
  • False
True or False:

Articles made of metals produce a ringing sound when struck hard.
  • True
  • False
A less reactive metal replaces a more reactive metal from its salt solution. True or False?
  • True
  • False
An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following 
  • Mg
  • Na
  • P
  • Ca
Which among the following statements are incorrect for magnesium metal?
  • It burns in oxygen with a dazzling white flame
  • It reacts with cold water to form magnesium oxide and evolves hydrogen gas
  • It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas
  • It reacts with steam to form magnesium hydroxide and evolves hydrogen gas
Based on the physical properties of metals, indicate whether the following statement is true or false :
Copper metal is sonorous.
  • True
  • False
What is formed by reaction of non-metal oxide with water?
  • Acid
  • Base
  • Salt
  • Metal
Which gas is produced by reaction of base with metal?
  • Carbon dioxide
  • Dioxygen
  • Dihydrogen
  • Dinitrogen
Based on the physical properties of metals, indicate whether the following statement is true or false :

The ductility of tungsten is high.
  • True
  • False
When sodium hydroxide reacts with aluminium metal:
  • sodium aluminate and water gas are formed
  • sodium aluminate and hydrogen gas are formed.
  • no reaction
  • can't say
A non-metal which is lustrous is :
  • brass
  • graphite
  • silicon
  • nitrogen
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