English
Maharashtra State BoardSSC (English Medium) 10th Standard

Corrosion of silver causes a black layer of _______.

Advertisements
Advertisements

Question

Corrosion of silver causes a black layer of _______.

Options

  • Silver nitrate

  • silver oxide

  • silver sulphide

  • silver carbonate

MCQ
Fill in the Blanks
Advertisements

Solution

Corrosion of silver causes a black layer of silver sulphide.

shaalaa.com
  Is there an error in this question or solution?
Chapter 8: Metallugy - Choose the correct option. [Page 9]

APPEARS IN

SCERT Maharashtra Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
Chapter 8 Metallugy
Choose the correct option. | Q 13. | Page 9

RELATED QUESTIONS

What are alloys?


Two methods by which rusting of iron can be prevented are ______ and ______.


Explain why rusting of iron objects is faster in coastal areas than in deserts.


Choose the correct answer from the options given below:

Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as

A. Smelting

B. Ore-dressing

C. Calcination

D. Bessemerisation


What special name is given to the corrosion of iron?


Name the metal which is used for galvanising iron.


In one method of rust prevention, the iron is not coated with anything. Which is this method?


Tiffin boxes are electroplated with ______ but car bumpers are electroplated with ______ to protect them from rusting.


The corrosion of copper produces a ______ coating of basic copper carbonate on its surface.


Explain why, though aluminium is more reactive than iron, yet there is less corrosion of aluminium when both are exposed to air.


Name any two metals which do not corrode easily.


Explain why, when a copper object remains in damp air for a considerable time, a green coating is formed on its surface. What is this process known as?


A common metal which is highly resistant to corrosion is ______.


No chemical reaction takes place when granules of a rusty-brown solid A are mixed with the powder of another solid B. However, when the mixture is heated, a reaction takes place between its components. One of the products C is a metal and settles down in the molten state while the other product D floats over it. It was observed that the reaction is highly exothermic.

  1. What could the solids A and B be?
  2. What are the products C and D most likely to be?
  3. Write the chemical equation for the reaction between A and B leading to the formation of C and D. Mention the physical states of all the reactants and products in this equation and indicate the heat change which takes place.
  4. What is the special name of such a reaction? State one use of such a reaction.
  5. Name any two types of chemical reactions under which the above reaction can be classified.

A metal X which is resistant to corrosion is produced by the electrolysis of its molten oxide whereas another metal Y which is also resistant to corrosion is produced by the reduction of its oxide with carbon. Metal X can be used in powder form in thermite welding whereas metal Y is used in making cathodes of ordinary dry cells.

  1. Name the metals X and Y.
  2. Which of the two metals is more reactive: X or Y?
  3. Name one ore or metal X. Also write its chemical formula.
  4. Name one ore of metal Y. Also write its chemical formula.
  5. Name one alloy of metal X and one alloy of metal Y.

Bronze is an alloy of ______.


Compare roasting and calcination.


Write scientific reasons.

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


Identify the process shown in the diagram and explain it in short


Write three methods of preventing rusting of iron.


Answer the following question.

List two properties of alloys.


Give reason.

Copper and brass utensils should be tinned.


Give a reason why rust turns moist red litmus blue.


Observe the following picture and answer the following questions:

  1. What is rust?
  2. Write the chemical formula of rust.
  3. Write the reaction of oxidation of iron at the anode.
  4. Write the reaction of oxidation of iron at the cathode.
  5. What is corrosion?

Find the odd one out and give its explanation.


Write the name.

An alloy of copper and tin-


Write scientific reason.

Anodization method is useful for prevention of the corrosion of the aluminium.


Complete flow chart given below.


Write a molecular formula for rust.


Observe the following diagram and give answers.

  1. Name this method of prevention of corrosion.
  2. For prevention of which metal this method is used?
  3. What is used as anode in this method?

Observe the following diagram and write answers.

  1. Name the method.
  2. Explain the method.
  3. Give two examples of this method.

What is rust?


The diagram shows the reaction between metal and dil. acid.

What is the reason for different behaviour of Mg in test tube B?


Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.

The substance not likely to contain CaCO3 is:


Identify the correct statement from the following:


Galvanisation is a process used to prevent the rusting of which of the following?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×