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Science M.C.Q

Metals and Non-Metals · MP Board (MPBSE) STD 10 (Madhya Pradesh - English Medium). 75 questions.

Questions · Page 2 of 2

M.C.Q

MCQ 511 Mark
Calamine ore can be used to extract one of the following metals. This metal is:
  • A
    Copper.
  • B
    Mercury.
  • C
    Aluminium.
  • ✓
    Zinc.
Answer
Correct option: D.
Zinc.
Calamine is an ore of zinc and its compound is zinc carbonate $\ce{(ZnCO_3)}$.
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MCQ 521 Mark
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
  • A
    $\ce{Al_2O_3 + Fe.}$
  • B
    $\ce{MnO_2 + Al.}$
  • ✓
    $\ce{Fe_2O_3 + Al.}$
  • D
    $\ce{Cu_2O + Fe.}$
Answer
Correct option: C.
$\ce{Fe_2O_3 + Al.}$
In this thermite reaction, iron $(III)$ oxide and aluminium powder are combined and heated. Iron oxide gets reduced to iron by the action of reducing agent aluminium and produces excess heat. The molten iron produced is poured in the middle of the broken pieces of irons that are fixed mutually.
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MCQ 531 Mark
If the number of protons in one atom of an element $Y$ is $20$ , then the number of electrons in its ion $Y ^{2+}$ will be:
  • A
    $20$
  • B
    $19$
  • ✓
    $18$
  • D
    $16$
Answer
Correct option: C.
$18$
Number of protons is equal to the number of electrons in an atom. It is given that an atom of an element $Y$ contains $20$ electrons.
Therefore, number of electrons in its ion $Y ^{2+}$ is $18(20-2)$
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MCQ 541 Mark
"Is malleable and ductile". This best describes:
  • ✓
    A metal.
  • B
    A compound.
  • C
    A non-metal.
  • D
    A solution.
Answer
Correct option: A.
A metal.
Because malleability and ductility are the properties of metals.
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MCQ 551 Mark
Out of aluminium, copper, calcium and tin, the most reactive metal is:
  • A
    Aluminium.
  • B
    Copper.
  • C
    Tin.
  • ✓
    Calcium.
Answer
Correct option: D.
Calcium.
Calcium lies above the other three metals in reactivity series.
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MCQ 561 Mark
The atomic number of an element $X$ is $16.$ The symbol of ion formed by an atom of this element will be:
  • A
    $\ce{X^{2+}}$
  • B
    $\ce{X^{3+}}$
  • ✓
    $\ce{X^{2−}}$
  • D
    $X^−$
Answer
Correct option: C.
$\ce{X^{2−}}$
Element $X$ needs $2$ electrons to complete its octet. Therefore, it forms $\ce{X^{2−}}$
anion.
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MCQ 571 Mark
Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions?
  • A
    $\ce{MgSO_4 + Fe.}$
  • B
    $\ce{ZnSO_4 + Fe.}$
  • C
    $\ce{MgSO_4 + Pb.}$
  • ✓
    $\ce{CuSO_4 + Fe.}$
Answer
Correct option: D.
$\ce{CuSO_4 + Fe.}$
Iron $(Fe)$ is a more reactive metal than copper, which can displace copper from copper sulphate.
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MCQ 581 Mark
The number of protons in the nucleus of one atom of an element $Y$ is $5$. The symbol of ion formed by an atom of this element will be:
  • A
    $Y^{3−}$
  • B
    $Y^{2+}$
  • C
    $Y^{2−}$
  • ✓
    $Y^{3+}$
Answer
Correct option: D.
$Y^{3+}$
Number of protons is equal to number of electrons in an atom. Hence, electronic configuration of element $Y$ is $2, 3$. Thus, it becomes stabilised by donating its $3$ electrons to form $Y^{3+}$
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MCQ 591 Mark
During the refining of an impure metal by electrolysis, the pure metal is a deposited:
  • ✓
    At cathode.
  • B
    On the walls of electrolytic tank.
  • C
    At anode.
  • D
    At the bottom of electrolytic tank.
Answer
Correct option: A.
At cathode.
In electrolytic refining, pure metal is always deposited at the cathode. The impure metal is made anode (positive terminal) and a thin rod of pure metal is made cathode (negative terminal). The salt of the metal is made electrolyte in the cell. When electricity passed through the cell, the impure metal dissolves in the electrolytic solution. The pure metal from the electrolytic solutions moves and gets deposited at the cathode.
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MCQ 601 Mark
You are given a solution of $\ce{AgNO_3}$. Which of the following do you think cannot displace $Ag$ from $\ce{AgNO_3}$ solution?
  • A
    Magnesium.
  • B
    Zinc.
  • ✓
    Gold.
  • D
    Copper.
Answer
Correct option: C.
Gold.
Because gold is less reactive than silver. The other metals are more reactive than silver and can displace it from silver nitrate solution.
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MCQ 611 Mark
A metal less reactive and another metal more reactive than hydrogen are:
  • A
    Aaluminium and lead.
  • B
    Iron and magnesium.
  • ✓
    Copper and tin.
  • D
    Copper and mercury.
Answer
Correct option: C.
Copper and tin.
Copper lies below hydrogen and tin lies above hydrogen in the reactivity series of metals.
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MCQ 621 Mark
Manganese metal is extracted from manganese dioxide by a reduction process by making use of:
  • A
    Carbon.
  • B
    Hydrogen.
  • C
    Electrolysis.
  • ✓
    Aluminium.
Answer
Correct option: D.
Aluminium.
There are some metals that cannot be satisfactorily reduced by carbon. In such cases, aluminium is used as reducing agent, e.g., manganese.
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MCQ 631 Mark
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
  • ✓
    Calcium.
  • B
    Carbon.
  • C
    Silicon.
  • D
    Iron.
Answer
Correct option: A.
Calcium.
Calcium reacts with oxygen to form calcium oxide with a high melting point. This compound is also soluble in water.
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MCQ 641 Mark
One of the following is not a neutral oxide. This is:
  • A
    $\ce{CO}$
  • B
    $\ce{H_2O}$
  • C
    $\ce{N_2O}$
  • ✓
    $\ce{Na_2O}$
Answer
Correct option: D.
$\ce{Na_2O}$
Because $\ce{Na_2O}$ is a metal oxide that is basic in nature.
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MCQ 651 Mark
An acidic oxide is produced by the element:
  • A
    $Na$
  • ✓
    $C$
  • C
    $Ca$
  • D
    $H$
Answer
Correct option: B.
$C$
Because $C$ is a non$-$metal, its oxide $CO _2$ is an acidic oxide.
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MCQ 661 Mark
If copper is kept exposed to damp air for a considerable time, it gets a green coating on its surface. This is due to the formation of:
  • A
    Hydrated copper sulphate.
  • B
    Copper oxide.
  • ✓
    Basic copper carbonate.
  • D
    Copper nitrate.
Answer
Correct option: C.
Basic copper carbonate.
Copper reacts slowly with water and carbon dioxide in the atmosphere to form copper carbonate. This gives a green colour coating to its surface.
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MCQ 671 Mark
The atomic number of an element $Y$ is $17$. The number of electrons in its ion $Y^−$ will be:
  • A
    $17$
  • ✓
    $18$
  • C
    $19$
  • D
    $20$
Answer
Correct option: B.
$18$
Anion $Y ^{-}$ has one more electron than its neutral atom. $Y$ atom has $17$ electrons and therefore, in $Y ^{-}$, number of electrons will be $18(17+1)$
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MCQ 681 Mark
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:
  • A
    Oxide.
  • B
    Hydride.
  • ✓
    Sulphide.
  • D
    Carbonate.
Answer
Correct option: C.
Sulphide.
Silver reacts with hydrogen sulphide gas in the air and forms a think black layer of silver sulphide $\ce{(Ag_2S)}$ on it. Silver jewellery or ornaments become dull because of the formation of silver sulphide coating on their surfaces.
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MCQ 691 Mark
The metal which can be extracted from the bauxite ore is:
  • A
    $Na$
  • B
    $Mn$
  • ✓
    $Al$
  • D
    $Hg$
Answer
Correct option: C.
$Al$
Aluminium can be extracted from bauxite. Bauxite is an ore of aluminium and the compound is aluminium oxide $\left( \ce{Al_2O_3 \cdot 2H_2O} \right)$.
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MCQ 701 Mark
Which of the following alloys contains a non-metal as one of the constituents?
  • A
    Brass.
  • B
    Amalgam.
  • ✓
    Steel.
  • D
    Bronze.
Answer
Correct option: C.
Steel.
Steel is an alloy that contains a non-metal carbon as one of its constituents. It consists of iron with carbon (0.1 to 1.5%).
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MCQ 711 Mark
One of the following compounds is not ionic in nature. This compound is:
  • A
    Lithium chloride.
  • B
    Ammonium chloride.
  • C
    Calcium chloride.
  • ✓
    Carbon tetrachloride.
Answer
Correct option: D.
Carbon tetrachloride.
It is a covalent compound.
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MCQ 721 Mark
Which of the following metals are extracted by the electrolysis of their molten chlorides?
  • A
    $Na$ and $Hg.$
  • B
    $Hg$ and $Mg.$
  • ✓
    $Na$ and $Mg.$
  • D
    $Cu $and $Fe.$
Answer
Correct option: C.
$Na$ and $Mg.$
Sodium $(Na)$ and magnesium $(Mg)$ are highly reactive metals. They are not easily reduced by carbon and aluminium. Thus, they are extracted by electrolytic reduction or electrolysis of their molten chlorides $($sodium chloride, $\ce{NaCl}$, and magnesium chloride, $\ce{MgCl_2}).$
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MCQ 731 Mark
The elements whose oxides can turn phenolphthalein solution pink are:
  • ✓
    Na and K.
  • B
    K and C.
  • C
    Na and S.
  • D
    K and P.
Answer
Correct option: A.
Na and K.
Because Na and K are metals whose oxides are basic in nature, which can turn phenolphthalein solution pink.
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MCQ 741 Mark
The molecules having triple bond in them are:
  • A
    Oxygen and ethyne.
  • B
    Carbon dioxide and ammonia.
  • C
    Methane and ethene.
  • ✓
    Nitrogen and ethyne.
Answer
Correct option: D.
Nitrogen and ethyne.
In a nitrogen molecule, each nitrogen atom shares its 3 electrons to form a triple bond among them. In an ethyne molecule, each carbon atom shares 3 electrons to form a triple bond among them.
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MCQ 751 Mark
The least reactive metal among the following is:
  • A
    Sodium.
  • ✓
    Silver.
  • C
    Copper.
  • D
    Lead.
Answer
Correct option: B.
Silver.
Because silver lies below other metals in the reactivity series.
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