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Science M.C.Q

P-1 Metallurgy · Maharashtra Board STD 10 (MSBSHSE - Semi English Medium). 48 questions.

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48 questions · timed · auto-graded

MCQ 11 Mark
Which of the following process is to be carried out to avoid the formation of greenish layer on brass vessels due to corrosion?
  • A
     Plating
  • B
     Anodization
  • ✓
    Tinning
  • D
    Alloying
Answer
Correct option: C.
Tinning
Tinning
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MCQ 21 Mark
A solution of $CuSO _4$ in water is in colour.
  • A
    pink
  • ✓
    blue
  • C
    colourless
  • D
     green
Answer
Correct option: B.
blue
A solution of $CuSO _4$ in water is blue in colour.
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MCQ 31 Mark
During the extraction of aluminium ……….
  • A
     Ingredients and gangue in bauxite
  • B
    Use of leaching during the concentration of ore
  • ✓
    Chemical reaction of transformation of bauxite into alumina by Hall’s process.
  • D
    Heating the aluminium ore with concentrated caustic soda.
Answer
Correct option: C.
Chemical reaction of transformation of bauxite into alumina by Hall’s process.
During the extraction of aluminium Chemical reaction of transformation of bauxite into alumina by Hall’s process.
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MCQ 41 Mark
What would be the correct order if $Zn , Fe , Al$ and $Cu$ are arranged in increasing order of reactivity?
  • ✓
    $Cu , Fe , Zn , Al$
  • B
    Al, Cu, Fe, $Zn$
  • C
    $Zn , Al , Cu , Fe$
  • D
    $Fe , Zn , Al , Cu$ 
Answer
Correct option: A.
$Cu , Fe , Zn , Al$
$Cu , Fe , Zn , Al$
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MCQ 51 Mark
A solution of …………. n water is green in colour.
  • A
    $CuSO _4$
  • ✓
    $FeSO _4$
  • C
    $ZnSO _4$
  • D
    $Al _2\left( SO _4\right)_3$
Answer
Correct option: B.
$FeSO _4$
A solution of $FeSO _4$ in water is green in colour.
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MCQ 61 Mark
A solution of ………… in water is blue in colour.
  • ✓
    $CuSO _4$
  • B
    $FeSO _4$
  • C
    $ZnSO _4$
  • D
    $Al _2\left( SO _4\right)_3$
Answer
Correct option: A.
$CuSO _4$
A solution of $CuSO _4$ in water is blue in colour.
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MCQ 71 Mark
A solution of $Al _2\left( SO _4\right)_3$ in water is
  • A
    blue
  • B
    pink
  • C
    green
  • ✓
    colourless
Answer
Correct option: D.
colourless
A solution of $Al _2\left( SO _4\right)_3$ in water is colourless.
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MCQ 81 Mark
Iron is ………
  • A
    more reactive than zinc
  • B
    more reactive than aluminuium
  • C
    less reactive than copper
  • ✓
    less reactive than aluminium
Answer
Correct option: D.
less reactive than aluminium
Iron is less reactive than aluminium.
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MCQ 91 Mark
To show that zinc is more reactive than copper, the correct procedure is to ………..
  • ✓
    prepare copper sulphate solution and dip a zinc strip in it
  • B
    prepare zinc sulphate solution and dip a copper strip in it
  • C
    heat together zinc and copper strips
  • D
    add dil. nitric acid to both the strips
Answer
Correct option: A.
prepare copper sulphate solution and dip a zinc strip in it
To show that zinc is more reactive than copper, the correct procedure is to prepare copper sulphate solution and dip a zinc strip in it.
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MCQ 101 Mark
Jewellery articles are gold plated ………….
  • A
    to prevent corrosion
  • B
    to prevent rusting of the base metal
  • C
    to make articles attractive
  • ✓
    all of these
Answer
Correct option: D.
all of these
all of these
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MCQ 111 Mark
…………. is the hardest substance and has the highest melting and boiling points.
  • A
    Iodine
  • B
    Sulphur
  • ✓
    Diamond
  • D
    Phosphorus
Answer
Correct option: C.
Diamond
Diamond is the hardest substance and has the highest melting and boiling points.
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MCQ 121 Mark
Silver gets corroded due to ………… in air.
  • A
    oxygen
  • ✓
    hydrogen sulphide
  • C
    carbon dioxide
  • D
    nitrogen
Answer
Correct option: B.
hydrogen sulphide
Silver gets corroded due to hydrogen sulphide in air.
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MCQ 131 Mark
………….. is used as an anode during the electrolytic reduction of bauxite.
  • A
    Sulphur
  • ✓
    Graphite
  • C
    Platinum
  • D
    Aluminium
Answer
Correct option: B.
Graphite
Graphite is used as an anode during the electrolytic reduction of bauxite.
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MCQ 141 Mark
………….. is obtained by the reduction of its oxide by carbon.
  • ✓
    Zinc
  • B
    Aluminium
  • C
    Sodium
  • D
    Potassium
Answer
Correct option: A.
Zinc
Zinc is obtained by the reduction of its oxide by carbon.
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MCQ 151 Mark
………… prevents the rusting of iron.
  • A
    Copper
  • ✓
    Zinc
  • C
    Aluminium
  • D
    Silver
Answer
Correct option: B.
Zinc
Zinc prevents the rusting of iron.
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MCQ 161 Mark
………….. has an oxide which is soluble in sodium hydroxide.
  • A
    Calcium
  • B
    Magnesium
  • C
    Iron
  • ✓
    Zinc.
Answer
Correct option: D.
Zinc.
Zinc has an oxide which is soluble in sodium hydroxide.
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MCQ 171 Mark
…………. is an allotropic form of a nonmetal which conducts electricity.
  • A
    Sulphur
  • ✓
    Graphite
  • C
    Chlorine
  • D
    Iodine
Answer
Correct option: B.
Graphite
Graphite is an allotropic form of a nonmetal which conducts electricity.
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MCQ 181 Mark
An alloy prepared from iron, nickel and chromium is known as …………
  • A
    brass
  • B
    bronze
  • ✓
    stainless steel
  • D
    amalgam
Answer
Correct option: C.
stainless steel
An alloy prepared from iron, nickel and chromium is known as stainless steel.
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MCQ 191 Mark
Bronze is an alloy of ………..
  • ✓
    copper and tin
  • B
    copper and zinc
  • C
    copper and iron
  • D
    iron and nickel
Answer
Correct option: A.
copper and tin
Bronze is an alloy of copper and tin.
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MCQ 201 Mark
………… is an ore of aluminium.
  • A
    Cryolite
  • ✓
    Bauxite
  • C
    Haematite
  • D
    Aluminium carbonate
Answer
Correct option: B.
Bauxite
Bauxite is an ore of aluminium.
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MCQ 211 Mark
………. is a basic oxide.
  • A
    $CO _2$
  • ✓
    $K _2 O$
  • C
    $SO _2$
  • D
    $Al _2 O _3$
Answer
Correct option: B.
$K _2 O$
$\underline{ K }_2 O$ is a basic oxide.
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MCQ 221 Mark
……….. is an acidic oxide.
  • A
    $Na _2 O$
  • ✓
    $CO _2$
  • C
    $FeO _3$
  • D
    $H _2 O$
Answer
Correct option: B.
$CO _2$
$CO _2$ is an acidic oxide.
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MCQ 231 Mark
………. is an amphoteric oxide.
  • A
    $Na _2 O$
  • B
    $MgO$
  • ✓
    $ZnO$
  • D
    $SO _2$
Answer
Correct option: C.
$ZnO$
$\underline{ ZnO }$ is an amphoteric oxide.
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MCQ 241 Mark
………. is a metal which is in liquid form at ordinary temperature and pressure.
  • A
    Magnesium
  • B
    Sodium
  • C
    Scandium
  • ✓
    Mercury
Answer
Correct option: D.
Mercury
Mercury is a metal which is in liquid form at ordinary temperature and pressure.
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MCQ 251 Mark
…………. is a good conductor of electricity.
  • A
    Bromine
  • B
    Iodine
  • ✓
    Graphite
  • D
    Sulphur
Answer
Correct option: C.
Graphite
Graphite is a good conductor of electricity.
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MCQ 261 Mark
Metalloids have properties of ………..
  • A
    metals
  • B
    nonmetals
  • ✓
    both metals and nonmetals
  • D
    neither metals nor nonmetals
Answer
Correct option: C.
both metals and nonmetals
Metalloids have properties of both metals and nonmetals.
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MCQ 271 Mark
………… is a metalloid.
  • A
    Aluminium
  • ✓
    Antimony
  • C
    Zinc
  • D
    Mercury
Answer
Correct option: B.
Antimony
Antimony is a metalloid.
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MCQ 301 Mark
Complete the following statement using every given options.
During the extraction of aluminium
  • A
    Ingredients and gangue in bauxite
  • B
    Use of leuching during the concentration of ore
  • ✓
    Chemical reaction of transformation of bauxite into alumina by Hall’s process
  • D
    Heating the aluminium ore with concentrated caustic soda
Answer
Correct option: C.
Chemical reaction of transformation of bauxite into alumina by Hall’s process
Chemical reaction of transformation of bauxite into alumina by Hall’s process.
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MCQ 311 Mark
In Tinning a layer of molten __________ is deposited on metals.
  • A
    Zinc
  • B
    Iron
  • ✓
    Tin
  • D
    Copper
Answer
Correct option: C.
Tin
Tin
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MCQ 321 Mark
Silver articles become black on prolonged exposure to air. This is due to the formation of __________.
  • A
    $Ag_3NO_3$​​​​​​​
  • B
    $Ag_2O$
  • ✓
    $Ag_2S$
  • D
    $Ag_2S$ and $Ag_3NO_3$
Answer
Correct option: C.
$Ag_2S$
$Ag_2S$
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MCQ 331 Mark
__________ react with dil. $HNO_3$ to evolve hydrogen gas.
  • A
    Iron and Copper
  • ✓
    Manganese and Magnesium
  • C
    Zinc and Manganese
  • D
    Aluminium and Magnesium
Answer
Correct option: B.
Manganese and Magnesium
Manganese and magnesium
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MCQ 341 Mark
Copper reacts with moist carbon - dioxide in air and slowly loses its shine to gain a green coat of __________.
  • A
    Copper oxide
  • B
    Iron oxide
  • ✓
    Copper carbonate
  • D
    None of the above
Answer
Correct option: C.
Copper carbonate
Copper carbonate
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MCQ 351 Mark
Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of __________.
  • A
    Aluminium
  • B
    Tin
  • C
    Silver
  • ✓
    Zinc
Answer
Correct option: D.
Zinc
Zinc
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MCQ 361 Mark
Substance used to decrease the melting point of alumina in Hall - Haroult process __________.
  • A
    $CuSO_4$
  • ✓
    Cryolite
  • C
    Gypsum
  • D
    Limonite
Answer
Correct option: B.
Cryolite
Cryolite
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MCQ 371 Mark
Which method is used for the purification of more reactive metals?
  • A
    Chemical reduction
  • B
    Roasting
  • C
    Calcination
  • ✓
    Electrochemical reduction
Answer
Correct option: D.
Electrochemical reduction
Electrochemical reduction
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MCQ 381 Mark
The main constituent of bauxite is __________.
  • ✓
    $Al_2O_3$
  • B
    $Al_2(SO_4)_3$
  • C
    $CaSO_4$
  • D
    $Na_3AlF_6$
Answer
Correct option: A.
$Al_2O_3$
$Al_2O_3$
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MCQ 401 Mark
The reactivity of metals with dil HCl in decreasing order is __________
  • A
    Mg >Zn >Al >Fe
  • B
    Mg > Al > Zn > Fe
  • C
    Fe >Zn> Al >Mg
  • D
    Fe >Al > Zn > Mg
Answer
Mg >Al >Zn >Fe
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MCQ 411 Mark
__________ is an oxide which is amphoteric.
  • A
    Copper oxide
  • B
    Magnesium dioxide
  • ✓
    Zinc oxide
  • D
    Calcium oxide
Answer
Correct option: C.
Zinc oxide
Zinc oxide
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MCQ 421 Mark
__________ is a non metal which conducts electricity.
  • A
    Diamond
  • B
    Iodine
  • C
    carbon
  • ✓
    Graphite
Answer
Correct option: D.
Graphite
Graphite
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MCQ 431 Mark
Metal oxides are generally __________ in nature.
  • A
    Acidic
  • ✓
    Basic
  • C
    Neither acidic nor basic
  • D
    Both acidic and basic
Answer
Correct option: B.
Basic
basic
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MCQ 451 Mark
__________ is the formula of cuprite.
  • ✓
    $Cu_2O$
  • B
    $Cu_2S$
  • C
    $CuCO_3$
  • D
    $CuCl_2$
Answer
Correct option: A.
$Cu_2O$
$Cu_2O$
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MCQ 461 Mark
__________ is the most reactive metal.
  • ✓
    Potassium
  • B
    Magnesium
  • C
    Calcium
  • D
    Sodium
Answer
Correct option: A.
Potassium
Potassium
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MCQ 471 Mark
__________ has the highest melting point.
  • ✓
    Tungsten
  • B
    Copper
  • C
    Iron
  • D
    Zinc
Answer
Correct option: A.
Tungsten
Tungsten
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MCQ 481 Mark
__________ is not a metalloid.
  • A
    Silicon
  • B
    Antimony
  • C
    Germanium
  • ✓
    Aluminium
Answer
Correct option: D.
Aluminium
Aluminium
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