P-1 Metallurgy - Maharashtra Board STD 10 Science Questions

Q 1M.C.Q1 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: C.

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Q 2M.C.Q1 Mark

A solution of $CuSO _4$ in water is in colour.

A
pink
✓
blue
C
colourless
D
green

Answer: B.

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Q 3M.C.Q1 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: C.

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Q 4M.C.Q1 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: A.

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Q 5M.C.Q1 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: B.

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Q 6Answer the following questions:[1 M]1 Mark

What is meant by corrosion?

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Q 7Answer the following questions:[1 M]1 Mark

Complete the following reactions: $2 C _{( s )}+ O _{2( g )} \stackrel{\text { Partial combustion }}{\longrightarrow}$

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Q 8Answer the following questions:[1 M]1 Mark

Complete the following reactions: $C _{( s )}+ O _{2( g )} \frac{\text { Complete }}{\text { Combustion }}-\cdots$

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Q 9Answer the following questions:[1 M]1 Mark

Why do new iron sheets appear shiny?

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Q 10Answer the following questions:[1 M]1 Mark

Can we permanently prevent the rusting of an iron article by applying a layer of paint on its surface?

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Q 11Give scientific reasons: [2 M]2 Marks

Anodes need to be replaced from time to time during the electrolysis of alumina.

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Q 12Give scientific reasons: [2 M]2 Marks

Pine oil is used in the froth floatation process.

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Q 13Give scientific reasons: [2 M]2 Marks

Sodium is always kept in kerosene.
(OR)
Why is sodium stored in kerosene?

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Q 14Give scientific reasons: [2 M]2 Marks

Generally the ionic compounds have high melting points.

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Q 15Give scientific reasons: [2 M]2 Marks

Lemon or tamarind is used for cleaning copper vessels turned greenish.

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Q 16Answer the following questions: [2 M]2 Marks

What is meant by space debris? Why is there need to manage the debris?

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Q 17Answer the following questions: [2 M]2 Marks

State the following statements into chemical equations and then balance them: Iron reacts with sulphuric acid.

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Q 18Answer the following questions: [2 M]2 Marks

State the following statements into chemical equations and then balance them: Zinc reacts with sulphuric acid.

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Q 19Answer the following questions: [2 M]2 Marks

State the following statements into chemical equations and then balance them: what happens when aluminium oxide dissolves in aqueous sodium hydroxide?

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Q 20Answer the following questions: [2 M]2 Marks

State the following statements into chemical equations and then balance them: Magnesium reacts with hot water.

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Q 21Answer the following questions: [3 M]3 Marks

Which measures would you suggest to stop the corrosion of metallic articles or not allow the corrosion to start?

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Q 22Answer the following questions: [3 M]3 Marks

When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation.

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Q 23Answer the following questions: [3 M]3 Marks

Column I	Column II
(1) Galvanising	(a) Pressure cooker
(2) Tinning	(b) Silver plated spoons
(3) Electroplating	(c) Coating of tin on copper
(4) Anodizing	(d) Coating of Zn on iron

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Q 24Answer the following questions: [3 M]3 Marks

Column I	Column II
(1) Copper and zinc	(a) Stainless steel
(2) Copper and tin	(b) Zinc amalgam
(3) Iron, nickel and chromium	(c) Bronze
(4) Mercury and zinc	(d) Brass
	(e) Steel

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Q 25Answer the following questions: [3 M]3 Marks

Column I	Column II
(1) $ZnS$	(a) Cuprous sulphide
(2) $HgS$	(b) Bauxite
(3) $Cu _2 S$	(c) Zinc blend
(4) $Al _2 O _3 \cdot H _2 O$	(d) Cinnabar
	(e) Cryolite