English
Maharashtra State BoardSSC (English Medium) 10th Standard

Gold plated ornaments is the example of ______.

Advertisements
Advertisements

Question

Gold plated ornaments is the example of ______.

Options

  • Electroplating

  • Alloying

  • Anodizing

  • Galvanizing

MCQ
Fill in the Blanks
Advertisements

Solution

Gold plated ornaments is the example of Electroplating.

shaalaa.com
  Is there an error in this question or solution?
2021-2022 (March) Set 1

RELATED QUESTIONS

What is an alloy?


Tinning : Tin : : Galvanizing : _________


 Which metals do not corrode easily?


Give reasons:

Platinum, gold and silver are used to make jewellery.


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


Write a chemical equation to show the process of corrosion of iron.


What type of chemical reaction is involved in the corrosion of iron?


The chemical reaction involved in the corrosion of iron metal is that of:
(a) oxidation as well as displacement
(b) reduction as well as combination
(c) oxidation as well as combination
(d) reduction as well as displacement


Name the metal which is used for galvanising iron.


State two conditions for the rusting of iron.


Fill in the following blanks with suitable words:
Tiffin boxes are electroplated with .............. but car bumpers are electroplated with ............... to protect them from rusting.


Fill in the following blanks with suitable words:
............ and .............. are necessary for the rusting of iron.


Why is an iron grill painted frequently?


 Name five methods of preventing rusting of iron.


What are the special properties of stainless steel?


Brass is an alloy of:
(a) Cu and Sn
(b) Cu and Pb
(c) Pb and Sn
(d) Zn and Cu


Four metals P, Q, R and S are all obtained by the reduction of their oxides with carbon. Metal P is used to form a thin layer over the sheets of metal S to prevent its corrosion. Metal Q is used for electroplating tiffin boxes made of metal S whereas metal R is used in making car batteries. Metals Q and R form an alloy called solder. What are metals P, Q, R and S? How have you arrived at this conclusion?


Mention two uses of the following metals and non-metals  

Iron 


What is corrosion? What are necessary conditions for corrosion?


Complete the process of iron rusting by filling the blanks. Suggest a way to prohibit the process.
The iron rust is formed due to........................... reaction. Different
regions on iron surface become anode and cathode.
 Reaction on anode region :

`F_e(s) → Fe^(2+) (aq) +2e^-`

 Reaction on anode region :

`O_2(g) + 4H^+(aq) +............................ → 2H_2 O (l) `

When Fe2+ ions migrate from anode region they react with ................... to form Fe3+ ions.
A reddish coloured hydrated oxide is formed from ............... ions. It is called rust.

`2Fe_(3+) (aq) + 4H_2O(l) → ................. + 6H_+(aq) `

A way to prevent rusting ..................................................................

 

 


Answer the following question.
a) What is meant by corrosion?
b) Write names of any two methods of prevention of corrosion.
c) In which method, metal like copper, aluminium are coated with a thin layer of their oxides by means of electrolysis.
d) Explain this method with diagram.


What are the adverse effects of corrosion?


Give reason.

A wooden article should be polished.


Write a short note on Alloying.


Find the odd one out and give its explanation.


Match the columns.

Group A Group B
1) Electroplating a) Pressure cooker
2) Anodising b) Silver plated spoons
  c) Coating of tin on copper
  d) Coating of Zinc on iron

Write the name.

An alloy of copper and tin-


Write scientific reason.

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


Explain concept with example/explain with the help of a balanced equation.

Corrosion


What is rust?


Write a molecular formula for rust.


Observe the following diagram and write answers.

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

Observe the following figure and write the answer of the question.

  1. Which process is shown in the figure?
  2. Explain the chemical reaction shown in the figure.
  3. Write the reactions on anode and cathode.

Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of ____________.


Amalgam is an alloy of ____________.


Copper objects lose their shine and form green coating of ____________.


A process of forming a thick oxide of aluminium when aluminium is exposed to air. This coat makes it resistant to corrosion. Resistance can be improved by making a layer of oxide thinker. In this technique, the aluminium article is the anode, and the electrolyte is sulphuric acid. The anode reaction results in the formation of a black-coloured film of aluminium oxide on the anode. By putting appropriate dyes in the electrolytic solution, both coloured surface with the decorative finish is achieved. Kitchen articles like anodised such as pressure cookers, pans and frames of sliding windows are applications of this technique.
  1. Name the anode and electrolyte used in this technique.
  2. How can we make aluminium articles made resistant to corrosion?
  3. Name the technique used to coat the aluminium articles.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×