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

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Q 26Answer the following questions: [5 M]5 Marks

Write short notes on: Leaching method

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Q 27Answer the following questions: [5 M]5 Marks

Write short notes on: Froth floatation method

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Q 28Answer the following questions: [5 M]5 Marks

Write short notes on: Magnetic separation method

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Q 29Answer the following questions: [5 M]5 Marks

Write short notes on: Hydraulic separation method

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Q 30Answer the following questions: [5 M]5 Marks

Write short notes on: Wilfley table method

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Q 31Write True or False1 Mark

Corrosion is degradation of a reaction with its environment.

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Q 32Write True or False1 Mark

copper reacts with moist carbon form copper carbonate.

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Q 33Write True or False1 Mark

Aluminium oxide is an acidic oxide.

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Q 34Write True or False1 Mark

silver amalgam is mainly used by dentists.

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Q 35Write True or False1 Mark

Silver plated spoon, gold plated ornaments are the examples of alloying.

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Q 36Name the Following1 Mark

Two nonmetals which are lustrous.

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Q 37Name the Following1 Mark

A metal which has the highest melting point.

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Q 38Name the Following1 Mark

Two metals which are found in the free state in nature.

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Q 39Name the Following1 Mark

The compound formed by the reaction between aluminium oxide and sodium hydroxide.

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Q 40Name the Following1 Mark

The process of heating the carbonate ore to a high temperature in limited air.

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Q 41Do As Directed.1 Mark

True or False : The reactivity of metals increase down to reactivity series.

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Q 42Do As Directed.1 Mark

True or False : The process of separating gangue from the ores is called concentration of ores.

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Q 43Do As Directed.1 Mark

True or False : The process of converting sulphide ores into oxides by heating strongly in excess of air is called Calcination.

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Q 44Do As Directed.1 Mark

True or False : The minerals from which the metal can be separated economically are called ores.

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Q 45Do As Directed.1 Mark

True or False : The elements or compounds which occur naturally is earth's crust are known as minerals.

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Q 46Fill in the blanks.1 Mark

Copper reacts with moist carbon dioxide in air and slowly loses its shine to gain a green coat of __________.

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Q 47Fill in the blanks.1 Mark

If one of the metal is mercury, then the alloy is known as __________.

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Q 48Fill in the blanks.1 Mark

The impurities present in an ore are called as __________.

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Q 49Fill in the blanks.1 Mark

Anodizing is a process of forming a thick oxide layer of __________.

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Q 50Fill in the blanks.1 Mark

Metals such as __________ , __________ and __________ do not react with water at all.

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Q 51Define :2 Marks

Patination of Copper

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Q 52Define :2 Marks

Magnetic Separation

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Q 53Define :2 Marks

Froth Floatation process

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Q 54Define :2 Marks

Hydraulic washing

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Q 55Define :2 Marks

Ionic compounds

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Q 56Find An Odd One Out1 Mark

Brass, Bronze, Steel, Antimony

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Q 57Find An Odd One Out1 Mark

Galvanizing, Tinning, Anodizing, Roasting

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Q 58Find An Odd One Out1 Mark

Steel, Iron, Copper, Tungsten

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Q 59Find An Odd One Out1 Mark

Sodium oxide, Zinc oxide, Potassium oxide, magnesium oxide.

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Q 60Find An Odd One Out1 Mark

Graphite, Iodine, Silver, Phosphorous.

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Q 61Distinguish Between :4 Marks

Cations and Anions

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Q 62Distinguish Between :4 Marks

Atoms and Ions

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Q 63Distinguish Between :4 Marks

Calcination and Roasting

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Q 64Distinguish Between :4 Marks

Metals and Non - metals. (based on chemical properties)

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Q 65Distinguish Between :4 Marks

Metals and Non - metals. (based on physical properties).

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Q 66Find the correlation.1 Mark

Coating of tin over metal: Tinning : : coating of zinc on iron : __________

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Q 67Find the correlation.1 Mark

Alumina $: AL_2O_3 : :$ Sodium aluminate $:$ __________

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Q 68Find the correlation.1 Mark

Cryolite $: AlF_3.3NaF : :$ Fluorspar $:$ __________

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Q 69Find the correlation.1 Mark

Aluminium : Bauxite : : Mercury : __________

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Q 70Find the correlation.1 Mark

Brass : Copper and zinc : : Bronze : __________

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Q 71Match the following.4 Marks

Column A	Column B
(1) Wilfley table method	(a) $SnO _2$ and $FeWO _4$
(2) Hydraulic separation method	(b) CuFeS2
(3) Magnetic separation method	(c) Ball mill
(4) Froth Floatation method	(d) Ore soaked in a solution
	(e) Law of gravitation

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Q 72Match the following.4 Marks

Column A	Column B
(1) React vigorously with cold water.	(a) Silver and copper
(2) React with hot water	(b) Iron and zinc
(3) React with steam	(c) Calcium
(4) React less vigorously with cold water	(d) Sodium and Potassium
	(e) Magnesium

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Q 73Match the following.4 Marks

Column A	Column B
(1) Bauxite	(a) Mercury
(2) Cassiterite	(b) Aluminium
(3) Cinnabar	(c) Tin

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Q 74Match the following.4 Marks

Substance	Property
(1) Potassium bromide	(a) Combustible
(2) Gold	(b) Soluble in water
(3) Sulphur	(c) No chemical reaction
(4) Neon	(d) High ductility

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Q 75Draw a neat labelled diagram.4 Marks

Hydraulic separation method.

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Q 76Draw a neat labelled diagram.4 Marks

Electrolytic reduction of alumina

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Q 77Draw a neat labelled diagram.4 Marks

Froth floatation method.

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Q 78Draw a neat labelled diagram.4 Marks

Magnetic separation method