TNPSC Chemistry - Metals and Their Compounds
Exam Duration: 45 Mins Total Questions : 30
Which one of the following metals occurs in nature in free state?
- (a)
Gold
- (b)
Sodium
- (c)
Aluminium
- (d)
Copper
Statement I Chlorine radicals CL initiate the chain reaction for ozone depletion.
Statement II Gaseous hypochlorous acid and chlorine photolysed by sunlight.
- (a)
Both the Statements are true and Statement II is the correct explanation of Statement I
- (b)
Both the Statements are true and Statement II is not the correct explanation of Statement I
- (c)
Statement I is true, but Statement II is false
- (d)
Statement I is false, but Statement II is true
Which one of the following consists only the ores of magnesium?
- (a)
Magnesite,carnallite,cassiterite,dolomite,epsom salt
- (b)
Magnesite,carnallite,dolomite,kieserite, epsom salt.
- (c)
Magnesite,carnallite,dolomite,galena,malachite
- (d)
Magnesite,cassiterite,kieserite,galena,malachite
Consider the following statements
1.Bronze is an alloy of copper and tin.
2.White gold is an alloy of gold containing platinum and lead.
Which of the statements given above is/are correct?
- (a)
Only 1
- (b)
Only 2
- (c)
Both 1 and 2
- (d)
Neither 1 nor 2
The most abundant metal in the earth's crust is
- (a)
Si
- (b)
Fe
- (c)
AL
- (d)
Cu
Match Column I with Column II and select the correct answer using the codes given the columns.
Column I(Alloy) | Column II(Constituent) |
A.Solder | 1.Iron and carbon |
B.Brass | 2.Copper and zinc |
C.Bronze | 3.Copper and tin |
D.Steel | 4.Lead and tin |
- (a)
A B C D 1 2 3 4 - (b)
A B C D 4 2 3 1 - (c)
A B C D 1 3 2 4 - (d)
A B C D 4 3 2 1
An example of an oxide ore is
- (a)
bauxite
- (b)
malachite
- (c)
Zinc blende
- (d)
galena
The gas used in a refrigerator is
- (a)
cooled down on flowing
- (b)
heated up on flowing
- (c)
cooled down when compressed
- (d)
cooled down when expanded
Which alloy contains Cu,Sn and Zn?
- (a)
Gun metal
- (b)
Solder
- (c)
Type metal
- (d)
Bronze
Which one of the following is known as salt peter?
- (a)
NaCl
- (b)
KNO3
- (c)
Na2CO3
- (d)
NaHCO3
Which one of the following is a transition metal?
- (a)
Aluminum(Al)
- (b)
Manganese(Mn)
- (c)
Magnesium(Mg)
- (d)
Calcium(Ca)
Which one of the following is the softest metal?
- (a)
Sodium
- (b)
Aluminium
- (c)
Iron
- (d)
Copper
The pair of metals, which evolves hydrogen, when treated with caustic soda solution, is
- (a)
Cu,Zn
- (b)
Hg,Au
- (c)
Al,Zn
- (d)
Ni,Al
Which one of the following metals is used for making boats because it does not corrode by sea water?
- (a)
Tungsten
- (b)
Antimony
- (c)
Nickel
- (d)
Titanium
Which one of the following is a true statement regarding calcination?
- (a)
The ore is heated strongly in the absence of any blast of air
- (b)
The ore is heated with calcium
- (c)
The ore is heated with carbon
- (d)
The mineral is melted with limestone
Consider the following statements.
1.Mercury is found in liquid state at room temperature.
2.The property of metals by which they can beaten into thin sheets is called malleability.
3.The property of metals by which it can be drawn into wires is called ductility.
Which of the statements given above are correct?
- (a)
1 and 2
- (b)
1 and 3
- (c)
2 and 3
- (d)
1,2 and 3
Wrought iron is
- (a)
iron mixed with 0.1 to 0.2% carbon
- (b)
cast iron
- (c)
alloy of steel
- (d)
impure sulphide mineral
When metal is obtained in the molten state from its ore, the process may be called
- (a)
rusting
- (b)
smelting
- (c)
calcination
- (d)
thermal dissociation
Consider the following statements
1.Iron is manufactured from the ore haematite.
2.Iron rusts in the presence of O2 and moisture.
3.Iron present in haemoglobin of blood.
Which of the above is/are correct about iron?
- (a)
Only 1
- (b)
2 and 3
- (c)
1 and 3
- (d)
1,2,and 3
Dead burnt is
- (a)
anhyrous Na2SO4
- (b)
Na2CO3 which is useful for softening.
- (c)
CaSO4 which is not useful for softening.
- (d)
anhydrous CuSO4
Which of the following is used in making ointment for curing skin disease?
- (a)
ZnCO3
- (b)
ZnSO4
- (c)
ZnO
- (d)
ZnS
Chemical leaching is useful in the concentration of
- (a)
copper pyrites
- (b)
bauxite
- (c)
galena
- (d)
cassiterite
Lead pencil contains
- (a)
graphite
- (b)
softened lead
- (c)
galena
- (d)
anglesite
By annealing, steel
- (a)
becomes soft
- (b)
becomes liquid
- (c)
becomes hard and brittle
- (d)
is covered with a thin film of Fe3O4
Why do alkali metals colour to the flame?
- (a)
They are electropositive elements
- (b)
They have low ionisation energies
- (c)
They belong to IA group
- (d)
They form ionic compounds
Match Column I with Column II
Column I | Column II |
A.German silver | 1.Tin |
B.Solder | 2.Nickel |
C.Bleaching power | 3.Sodium |
D.Hypo | 4.Chlorine |
- (a)
A B C D 2 1 4 3 - (b)
A B C D 1 4 3 2 - (c)
A B C D 4 3 2 1 - (d)
A B C D 3 2 1 4
Consider the following statements
1.Copper pyrites (CuFeS2 ) are concentrated by froth-floatation method.
2.Iron ore is concentrated by magnetic treatment.
3.The oil used in the froth floatation method for the purification of ores is pine oil.
Which of the above is/are correct?
- (a)
Only 1
- (b)
Only 2
- (c)
1,2 and 3
- (d)
1 and 3
Barium in a suitable form is administered to patients before an X-ray examination of the stomach, because
- (a)
barium allows X-rays to pass through the stomach on account of its transparency to X-rays.
- (b)
barium compound ,like magnesium sulphate helps in cleaning the stomach before X-rays examination.
- (c)
barium is a good absorber of X-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture.
- (d)
barium salts are white in colour and this help the stomach to appear clearly in contrast with regions in the picture.
Consider the following statements
1.Gold is the most ductile metal.
2.The beast conductors of heat are silver and copper.
3.Alkali metals (lithium,sodium,potassium) are so left they can be cut with a knife.
Which of the statements given above are correct?
- (a)
1 and 2
- (b)
1 and 3
- (c)
2 and 3
- (d)
1,2 and 3
Consider the following statements
1.Galvanisation is the method of method of protecting steel and iron from rusting by coating them with a thin layer of zinc.
2.Pure iron is very soft but if is mixed with a small amount of carbon, it becomes hard and strong.
3.When iron is mixed with nickel and chromium,we get stainless steel, which is hard and does not rust.
Which of the statements given above are correct?
- (a)
1 and 2
- (b)
1 and 3
- (c)
2 and 3
- (d)
1,2 and 3