Balbharati solutions for साइंस एण्ड टेक्नॉलोजी पार्ट १ [अंग्रेजी] कक्षा १० महाराष्ट्र राज्य बोर्ड chapter 8 - Metallurgy [Latest edition]

Which method do we use when we want to study many things together and at the same time?

State any five physical properties of metals.

State any five physical properties of non-metals.

In the reaction between chlorine and HBr a transformation of HBr into Br₂ takes place. Can this transformation be called oxidation? Which is the oxidant that brings about this oxidation?

What is the electronic definition of oxidation?

What is the electronic definition of oxidation?

Write the electrode reaction for the electrolysis of molten magnesium chloride.

Write the electrode reaction for the electrolysis of molten calcium chloride.

What are the moderately reactive metals?

In which form do the moderately reactive metals occur in nature?

What is corrosion?

Have you seen the following thing?

Old iron bars of buildings.

Have you seen the following thing?

Copper vessels not cleaned for long time.

Have you seen the following thing?

Silver ornaments or idols exposed to air for a long time.

Have you seen the following thing?

Old vehicles fit to be thrown away.

Why do silver articles turn blackish while copper vessels turn greenish on keeping in air for a long time?

Why do pure gold and platinum always glitter?

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

What is done so to prevent rusting of iron windows and iron doors of your house?

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

What are the various alloys used in daily life? Where are those used?

What are the properties that the alloy used for minting coins should have?

Write name.
 Alloy of sodium with mercury.

Write name.

Molecular formula of the common ore of aluminium.

Write name.

The oxide that forms salt and water by reacting with both acid and base.

Write name.

The device used for grinding an ore.

Write name.

The nonmetal having electrical conductivity.

Write name. 

 The reagent that dissolves noble metals.

Make pairs of substances and their properties

Identify the pairs of metals and their ores from the following.

Explain the term Metallurgy.

Explain the following term: 

Ores

Explain the term Minerals.

Explain the term Gangue.

Write scientific reasons.

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

Write scientific reason.

Generally the ionic compounds have high melting points.

Write scientific reason.

Sodium is always kept in kerosene.

Write scientific reason.

Pine oil is used in froth flotation.

Write scientific reason.

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

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.

The electronic configuration of metal ‘A’ is 2,8,1 and that of metal ‘B’ is 2,8,2. Which of the two metals is more reactive? Write their reaction with dilute hydrochloric acid.

Draw a neat labelled diagram.

Magnetic separation method.

Draw a neat labelled diagram.

Froth floatation method.

Draw a neat labelled diagram.

Electrolytic reduction of alumina.

Draw a neat labelled diagram.

Hydraulic separation method.

Write chemical equation for the event.
Aluminium came in contact with air.

Write a chemical equation for the event.

Iron filings are dropped in aqueous solution of copper sulphate.

Write the chemical equation for the event.

A reaction was brought about between ferric oxide and aluminium.

Write chemical equation for the event.

Electrolysis of alumina is done.

Write a chemical equation for the following event.

Zinc oxide is dissolved in dilute hydrochloric acid.

Complete the  statement using every given option.
During the extraction of aluminium..............

Ingredients and gangue in bauxite.

Complete the  statement using every given option.
During the extraction of aluminium..............

Use of leaching during the concentration of ore.

Complete the  statement using every given option.
During the extraction of aluminium..............

Chemical reaction of transformation of bauxite into alumina by Hall’s process.

Complete the statement using every given option.

During the extraction of aluminium.........

Heating the aluminium ore with concentrated caustic soda.

Divide the metals Cu, Zn, Ca, Mg, Fe, Na, Li into three groups, namely reactive metals, moderately reactive metals and less reactive metals.