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question_answer1)
Identify the ore of zinc.
A)
Calamine done
clear
B)
Dolomite done
clear
C)
Haematite done
clear
D)
Cryolite done
clear
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question_answer2)
Which gas is liberated when copper is treated with concentrated \[{{H}_{2}}S{{O}_{4}}\]?
A)
\[S{{O}_{2}}\] done
clear
B)
\[S{{O}_{3}}\] done
clear
C)
\[{{H}_{2}}\] done
clear
D)
\[{{H}_{2}}S\] done
clear
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question_answer3)
Which of the following elements liberate hydrogen on reacting with diluted nitric acid?
A)
Zn and Mg done
clear
B)
Mn and Sn done
clear
C)
Mg and Mn done
clear
D)
Mn and Fe done
clear
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question_answer4)
Which of the given metals is stored under kerosene to prevent oxidation?
A)
Copper done
clear
B)
Potassium done
clear
C)
Magnesium done
clear
D)
Calcium done
clear
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question_answer5)
In Which property of a metal helps it to bear a lot of strain?
A)
Hardness done
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B)
Tensile strength done
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C)
Ductility done
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D)
Malleability done
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question_answer6)
Which of the following ores are subjected to froth floatation?
A)
\[A{{l}_{2}}{{O}_{3}}\] done
clear
B)
\[ZnS\] done
clear
C)
\[CaC{{l}_{2}}\] done
clear
D)
\[KCl\] done
clear
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question_answer7)
Which of the following metals is obtained from its ores by reduction method using carbon?
A)
Zinc done
clear
B)
Calcium done
clear
C)
Magnesium done
clear
D)
Gold done
clear
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question_answer8)
Which of the following is used as flux in the extraction of iron?
A)
Limestone done
clear
B)
Silica done
clear
C)
Flint done
clear
D)
Feldspar done
clear
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question_answer9)
Why is polling process employed?
A)
For the removal of \[C{{u}_{2}}O\] from Cu done
clear
B)
For the removal of \[A{{l}_{2}}{{O}_{3}}\] from Al done
clear
C)
For the removal of \[F{{e}_{2}}{{O}_{3}}\] from Fe done
clear
D)
For the removal of \[MgC{{l}_{2}}\] from Mg done
clear
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question_answer10)
Identify the formula of super phosphate of lime?
A)
\[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}\] done
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B)
\[CaHP{{O}_{4}}\] done
clear
C)
\[Ca{{(OH)}_{2}}\] done
clear
D)
\[Ca{{({{H}_{2}}P{{O}_{4}})}_{2}}{{H}_{2}}O\] done
clear
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question_answer11)
How is \[{{P}_{2}}{{O}_{5}}\] mainly used?
A)
As an oxidizing agent done
clear
B)
As a reducing agent done
clear
C)
As a drying agent done
clear
D)
As a hydrating agent done
clear
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question_answer12)
Nitric acid oxidises sulphur to form
A)
\[S{{O}_{2}}\] done
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B)
\[S{{O}_{3}}\] done
clear
C)
\[{{H}_{2}}{{S}_{2}}{{O}_{7}}\] done
clear
D)
\[{{H}_{2}}S{{O}_{4}}\] done
clear
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question_answer13)
Which gas is evolved when copper is treated with dil. \[HN{{O}_{3}}\]?
A)
\[{{H}_{2}}\] done
clear
B)
NO done
clear
C)
\[{{N}_{2}}O\] done
clear
D)
\[{{N}_{2}}{{O}_{3}}\] done
clear
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question_answer14)
Which of the given metals does not react with sulphuric acid?
A)
Iron done
clear
B)
Gold done
clear
C)
Zinc done
clear
D)
Magnesium done
clear
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question_answer15)
Which metals are used to make solder?
A)
Lead done
clear
B)
Tin done
clear
C)
Copper done
clear
D)
Both (a) and (b) done
clear
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question_answer16)
Which pair of metals are extracted just by heating with their sulphide ores in air?
A)
Mercury and copper done
clear
B)
Mercury and magnesium done
clear
C)
Silver and mercury done
clear
D)
Iron and mercury done
clear
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question_answer17)
\[S{{O}_{2}}\] can act as a/an
A)
oxidizing agent. done
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B)
reducing agent. done
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C)
bleaching agent. done
clear
D)
All of the above done
clear
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question_answer18)
Identify the constituent metals o sterling silver.
A)
Silver and copper done
clear
B)
Copper and zinc done
clear
C)
Silver and gold done
clear
D)
Silver and aluminium done
clear
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question_answer19)
Complete the reaction given below. \[ZnO+2NaOH\to ?\]
A)
\[Zn{{(OH)}_{2}}+{{H}_{2}}O\] done
clear
B)
\[N{{a}_{2}}Zn{{O}_{2}}+{{H}_{2}}O\] done
clear
C)
\[Zn{{(OH)}_{2}}+N{{a}_{2}}O\] done
clear
D)
\[N{{a}_{2}}Zn{{O}_{2}}+N{{a}_{2}}O\] done
clear
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question_answer20)
Which type of ores are subjected to roasting?
A)
Oxide ores done
clear
B)
Silicate ores done
clear
C)
Sulphide ores done
clear
D)
Carbonate ores done
clear
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question_answer21)
In which of the following is thermite welding done?
A)
Girders done
clear
B)
Railway tracks done
clear
C)
Cracked machine parts done
clear
D)
All of the above done
clear
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question_answer22)
A particular metal forms an invisible protective layer and prevents further oxidation. Identify the metal, its oxide and chemical formula.
A)
Iron, iron oxide, \[F{{e}_{2}}{{O}_{3}}\] done
clear
B)
Aluminium, aluminium oxide, \[A{{l}_{2}}{{O}_{3}}\] done
clear
C)
Zinc, zinc oxide, \[\text{ZnO}\] done
clear
D)
Copper, copper oxide, \[\text{CuO}\] done
clear
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question_answer23)
Identify an alloy that is used in the making of pressure cooker.
A)
Magnalium done
clear
B)
Duralumin done
clear
C)
AInico done
clear
D)
Nickel steel done
clear
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question_answer24)
Pure gold is soft. Which metal is added to 22 carat gold to make ornaments?
A)
Platinum done
clear
B)
Aluminium done
clear
C)
Copper done
clear
D)
Iron done
clear
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question_answer25)
Which is the best process for the refining of metals?
A)
Liquation done
clear
B)
Cupellation done
clear
C)
Polling done
clear
D)
Electrolytic refining done
clear
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question_answer26)
Which of the following is/are formed when aluminium oxide reacts with \[\text{NaOH}\] solution?
A)
No reaction takes place. done
clear
B)
Oxygen gas is evolved. done
clear
C)
Salt and water are formed. done
clear
D)
Hydrogen gas is evolved. done
clear
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question_answer27)
What is the chemical compositon of thermite?
A)
A mixture of \[F{{e}_{2}}{{O}_{3}}\] and aluminium powder done
clear
B)
A mixture of Mg and \[Ba{{O}_{2}}\] done
clear
C)
A mixture of \[A{{l}_{2}}{{O}_{3}}\] and iron done
clear
D)
A mixture of Mg and \[Al\] powder done
clear
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question_answer28)
Which of the following is a metalloid?
A)
Carbon done
clear
B)
Silicon done
clear
C)
Germanium done
clear
D)
Tin done
clear
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question_answer29)
Which is the lightest metal?
A)
Beryllium done
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B)
Aluminium done
clear
C)
Lithium done
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D)
Caesium done
clear
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question_answer30)
Which metal expands on solidification?
A)
Type metal done
clear
B)
Gun metal done
clear
C)
Fuse metal done
clear
D)
Bell metal done
clear
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question_answer31)
Study the following steps. \[C{{u}_{2}}S\xrightarrow[{}]{roasted\,in\,air}(X)\xrightarrow[{}]{rouasted\,without\,air}(Y)\] Based on the above steps, identify X and Y.
A)
B)
C)
D)
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question_answer32)
Given below is the apparatus showing the electrolysis of a substance in Nelson's cell.
When 'P' undergoes electrolysis 'Q' and 'R' are formed. 'Q' can be used in preparing soaps and detergents. 'R' can be used in the preparation of PVC, CFC and in swimming pools. What are P, Q and R?
A)
B)
C)
D)
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question_answer33)
Four colourless salt solutions given in the figures are placed in separate containers and a copper rod is dipped in each. In which container does the solution turn blue?
A)
B)
C)
D)
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question_answer34)
Brass is an alloy of
A)
Cu and \[Sn\]. done
clear
B)
Cu and Zn. done
clear
C)
Cu and \[Al\]. done
clear
D)
\[Sn\] and \[Pb\]. done
clear
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question_answer35)
In the thermite process, which of the following is used as a reducing agent?
A)
C done
clear
B)
\[Al\] done
clear
C)
Na done
clear
D)
Mg done
clear
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question_answer36)
Which method is employed for obtaining a pure metal?
A)
Froth floatation done
clear
B)
Electrolytic refining done
clear
C)
Magnetic separation done
clear
D)
Gravity separation done
clear
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question_answer37)
Which of the following statements is/are true based on the given reactions?
- \[ZnO+C\to Zn+CO\]
- \[2F{{e}_{2}}{{O}_{3}}+3C\to 4Fe+3C{{O}_{2}}\]
A)
Carbon is reduced. done
clear
B)
Metal oxide is reduced. done
clear
C)
Metal oxide is oxidized. done
clear
D)
Both (b) and (c) done
clear
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question_answer38)
What happens when a mixture of powdered iron and copper (II) oxide are heated in a crucible?
A)
Iron (II) oxide and copper are formed. done
clear
B)
Copper (III) oxide and iron (II) oxide are formed. done
clear
C)
Iron (III) oxide and copper sulphate are formed. done
clear
D)
No reaction takes place. done
clear
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question_answer39)
Which of the following statements is correct?
A)
All metals are ductile. done
clear
B)
All non-metals are ductile. done
clear
C)
Generally, metals are ductile. done
clear
D)
Some non-metals are ductile. done
clear
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question_answer40)
Identify 'X' and 'Y' in the given chemical equation.
- \[X+YS{{O}_{4}}\to Y+XS{{O}_{4}}\]
A)
Na and Mg done
clear
B)
Zn and Cu done
clear
C)
Ag and K done
clear
D)
H and \[Al\] done
clear
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