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Science [2 Mark Questions]

Metals and Non-Metals · CBSE STD 10 (CBSE - English Medium). 9 questions.

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[2 Mark Questions]

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9 questions · timed · auto-graded

Question 12 Marks
Name one metal and one non-metal that exist in liquid state at room temperature. Also name two metals having melting point less than 310K (37°C).
Answer
Metal in liquid state is mercury, non-metal in liquid state is bromine.
Gallium (Ga) and Cesium (Cs) have melting point below 310K.
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Question 22 Marks
Give the formulae of the stable binary compounds that would be formed by the combination of following pairs of elements.
1. Mg and $N _2$
2. Li and $O _2$
3. Al and $Cl _2$
4. K and $O _2$
Answer
1. Magnesium nitride - $\left( Mg _3 N_2\right)$
2. Lithium oxide - ( $\left.Li _2 O \right)$
3. Aluminium chloride - $\left( AlCI _3\right)$
4. Potassium oxide - ( $\left.K _2 O \right)$
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Question 32 Marks
A metal M does not liberate hydrogen from acids but reacts with oxygen to give a black colour product. Identify M and black coloured product and also explain the reaction of M with oxygen.
Answer
Because of less reactivity, copper metal does not release hydrogen gas with acid.
$Cu ( s )+ HCl \rightarrow$ No reaction
Hence, metal M is copper.
Reaction of copper with oxygen on prolonged heating to form a black substance copper (II) oxide (CuO).
$2 Cu(s)+O_2(g) \rightarrow 2 CuO(s)$
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Question 42 Marks
The following reaction takes place when aluminium powder is heated with $MnO _2$.
$3 MnO_2(s)+4 Al(s) \rightarrow 3 Mn(I)+2 Al_2 O_3(I)+\text { Heat }$
1. Is aluminium getting reduced?
2. Is $MnO _2$ getting oxidised?
Answer
1. Aluminium is getting oxidised to $Al _2 O _3$.
2. Manganese dioxide is getting reduced to Mn .
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Question 52 Marks
Give two examples each of the metals that are good conductors and poor conductors of heat respectively.
Answer
Good conductors of heat are copper and silver. Poor conductors of heat are lead and mercury.
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Question 62 Marks
What are the constituents of solder alloy? Which property of solder makes it suitable for welding electrical wires?
Answer
Solder is a fusible metal alloy of lead (Pb) and tin (Sn). It contains 40% lead and 60% of Sn metal. Solder has a low melting point around 90°C to 450°C as compared to the metals used in forming electrical wires. So, it acts as bridge between two metal pieces, hence used for welding electrical wires.
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Question 72 Marks
An alkali metal A gives a compound B (molecular mass = 40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and give the reaction involved.
Answer
'A' is sodium, 'B' is NaOH (Molecular weight = 40)$2\text{Na(s) + 2H}_2\text{O(l)}\rightarrow2\text{NaOH(aq) + H}_2\text{(g)}\\\ \ \ '\text{A}'\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ '\text{B}'$
$\text{Al}_2\text{O}_3\text{(s) + 2NaOH(aq)}\rightarrow2\text{NaAlO}_2\text{(aq) + H}_2\text{O(l)}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ '\text{B}'\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Sodium meta aluminate}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ '\text{C}'$
'C' is sodium meta aluminate, soluble in water.
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Question 82 Marks
What happens when.
1. $ZnCO _3$ is heated in the absence of oxygen?
2. A mixture of $Cu _2 O$ and $Cu _2 S$ is heated?
Answer
1. Zinc oxide(s) and $CO _2(g)$ are formed.
$ZnCO_3(s) \xrightarrow{\text { heat }} ZnO(s)+CO_2 \text { (g) }$
2. Blister copper(s) and $SO _2(g)$ are formed.
$2 Cu_2 O(s)+Cu_2 S(s) \xrightarrow{\text { heat }} 6 Cu(s)+SO_2(g)$
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Question 92 Marks
Give the reaction involved during extraction of zinc from its ore by.
  1. Roasting of zinc ore.
  2. Calcination of zinc ore.
Answer
  1. Roasting:
$2\text{Zns(s) + 3O}_2\text{(g)}\xrightarrow{\text{heat}}2\text{ZnO(s) + 2SO}_2\text{(g)}$
  1. Calcination:
$\text{ZnCO}_3\text{(s)}\xrightarrow{\text{heat}}\text{ZnO(s) + CO}_2\text{(g)}$​​​​​​​
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[2 Mark Questions] - Science STD 10 Questions - Vidyadip