18 carat gold contains
1. 60% gold
2. 18% gold
3. 75% gold
4. 80% gold
90% pure silver has fineness
1.9
2.18
3.900
4.90
Argyrol is used as mild antiseptic and germicide. It is a colloidal solution of
1.Hg
2.Ag
3.Au
4.As
Brass is an alloy of
1.Cu, Zn and Sn
2.Cu and Sn
3.Cu and Ni
4.Cu and Zn.
Bronze is an alloy of copper and
1.Tin
2.Zinc
3.Nickel
4.Tin and zinc.
Calamine is an ore of
1.Lead
2.Zinc
3.Tin
4.Mercury
Commercially important ore of lead is
1.Galena
2.Siderite
3.Hematite
4.Sphaterite.
Cyanide process is used for the extraction of
1.Agt
2.Cu
3.Au
4.Both (a) and (c).
During electrorefining of copper gold may be recovered from
1.Electrolyte
2.Anode mud
3.Cathode
4.Cathode mud.
During extraction of iron the flux used is
1.Silica
2.Calcium silicate
3.Lime stone
4.Coke.
During extraction of iron, obtained at the bottom of blast furnace is known as
1.Steel
2.Wrought iron
3.Cast iron
4.None of these.
Fineness is the term used to express purity of
1.Gold
2.Silver
3.Copper
4.Lead.
In the manufacture of steel from pig iron the following is used
1.Bessemer converter
2.Muffle furnace
3.Blast furnace
4.Carbon deduction.
In the metallurgy of iron the lime stone addedremoves calcium ions as
1.Slag
2.Gangue
3.Metallic calcium
4.Calcium carbonate
Iron is protected from rusting by coating it with a thin layer of
1.Mg
2.Ca
3.Zn
4.K.
Mercury is transported in metal containers made of
1.Silver
2.Lead
3.Iron
4.Aluminium.
Parting is the process associated with the purification of
1.Gold
2.Silver
3.Copper
4.Mercury.
Photographic films and plates have an essential ingredient of
1.Silver nitrate
2.Silver bromide
3.Sodium chloride
4.Oleic acid.
Quenched steel is None of these.
1.Hard
2.Brittle
3.Both of the above
4.None of these.
Quick silver is
1.Ag
2.Hg
3.Sn
4.Pb.
Silver chloride is soluble in
1.Ammonia
2.Sodium thiosulphate
3.Potassium cyanide
4.All of the above.
The most stable oxidation state of copper is
1.Cu (I)
2.Cu (II)
3.Cu (III)
4.Cu (IV).
The oxide ore of zinc is
1.Calamine
2.Zinc Blende
3.Zincite
4.Cassiterite.
The percentage of carbon in steel is in the range
1.3 - 5%
2.2 - 3%
3.1 - 2%
4.0.1 - 1.5%.
The percentage of carbon is least in
1.Pig iron
2.Wrought iron
3.Steel
4.Cast iron.
Which of the following alloys of iron contains highest percentage of nickel?
1.Nickel steel
2.Stainless steel
3.Invar
4.Alnico.
Which of the following alloys of steel contains highest percentage of nickel? .
1.stainless steel
2.Invar
3.Nickel steel
4.Permalloy
Which of the following compounds is soluble in water?
1.AgCl
2.AgBr
3.Agl
4.AgF.
Which of the following elements does not exhibit any oxidation states involving d-electrons?
1.Copper
2.Zinc
3.Iron
4.Gold.
Which of the following elements is present in hemoglobin?
1.Mg
2.Fe
3.Cu
4.Zn.
Which of the following is used as antacid in medicines?
1.Milk of magnesia
2.Milk of lime
3.Lime water
4.Baryta.
Which of the following metals does not react with chlorine? None of these.
1.Copper
2.Silver
3.Gold
4.None of these.
Which of the following metals exhibits variable valency due to inert pair effect?
1.Iron
2.Lead
3.Mercury
4.Copper.
Which of the following metals has maximum density?
1.Iron
2.Copper
3.Silver
4.Gold.
Which of the following metals may be present in the anode mud during electrorefining of copper? I. Gold II. Iron III. Silver IV. Magnesium.
1.I and II
2.II and IV
3.I and III
4.III and IV
Which of the following metals occurs in nature in combined as well as in native state?
1.Zinc
2.Gold
3.Mercury
4.Silver
Which of the following metals on reaction with hot solution of sodium hydroxide dissolves and liberates hydrogen gas?
1.Hg
2.Ag
3.Fe
4.Zn
Which of the following salts is heptahydrate?
1.Green vitriol
2.Mohrs salt
3.Blue vitriol
4.Ferric alum.
Which of the following salts is hexahydrate?
1.Blue vitriol
2.Green vitriol
3.White vitriol
4.Mohrs salt.
Which of the following statements about ferric chloride is not correct?
1.It is a covalent compound
2.It sublimes on heating
3.Its aqueous solution is basic
4.Anhydrous ferric chloride is dimmer.
Which of the following statements is not correct?
1.Wrought iron is ductile, soft and malleable
2.Anneabled steel is soft
3.Tempering increases the hardness of steel
4.Hardness of steel increases with increases in carbon content.
Which of the following sulphides is black in colour ?
1.MnS
2.CdS
3.CoS
4.ZnS.
Which one of the following is an ore of silver?
1.Argentite
2.Azurite
3.Cassiterite
4.Cerussite.
Zinc oxide is
1.Acidic
2.Basic
3.Neutral
4.Amphoteric.