Tag: uses of metals and non metals

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Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Molten silver absorbs _________ which is given off on cooling causing violent spurting. This is called splitting of silver and can be prevented by covering the molten metal with a layer of charcoal.

  1. carbon monooxide

  2. carbon dioxide

  3. carbon

  4. charcoal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Molten silver absorbs oxygen which is given off on cooling causing violent spurting. This is called splitting of silver and can be prevented by covering the molten metal with a layer of charcoal.

Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

The percent of silver in silver - copper alloy used for jewellery purposes has _______ % silver.

  1. 20

  2. 40

  3. 60

  4. 80
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The percent of silver in silver - copper alloy used for jewellery purposes has 80 % silver and 20% copper. Silver copper alloy is used in coins, ornaments, silver ware, decoration pieces, etc.

Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Which of the following is/are true regarding the physical properties of silver?

  1. It is white, lustrous, lightweight metal.

  2. It is very malleable and ductile, coming before gold in this property.

  3. It is poor conductor of heat and electricity.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The following  are true regarding the physical properties of silver.
It is white, lustrous, heavy metal.
It is very malleable and ductile, coming next to gold in this property.
It is best conductor of heat and electricity.

Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess?

  1. Metal

  2. Non-Metal

  3. Metalloid

  4. Semi-conductor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Metal

Malleable high melting and boiling point, lustrous hard, high density and a good conductor of heat and electricity.

Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Which of the following is/are true regarding uses of silver?

  1. Silver leaves are used in filling teeth.

  2. Silver amalgam is used in Ayurvedic and Yunani medicines.

  3. Silver is used in silver plating.

  4. It is used in the preparation of silver salts used in silvering of mirrors, photography and medicine.
Reveal answer Fill a bubble to check yourself
C,D Correct answer
Explanation

The following are true regarding uses of silver.
Silver amalgam is used in filling teeth.
Silver leaves are used in Ayurvedic and Yunani medicines.
Silver is used in silver plating.
It is used in the preparation of silver salts used in silvering of mirrors, photography and medicine.

Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

__and ___are alloys of copper.

  1. Brass and bronze

  2. Brass and alloy steel

  3. Copper pyrites and malachite

  4. Copper glance and cuprite
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • A homogeneous mixture of two or more elements is known as Alloys.
  • There are various alloys of copper:
Brass-Copper with zinc, Bronze-Copper with tin, and Coinage alloy-copper with nickel.
  • Hence, option  A is correct.

Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Classify the following as physical or chemical properties.
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.

  1. Physical property

  2. Chemical property
  3. Both $A$ and $B$
  4. Neither $A$ or $B$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Steel is an alloy of various metals, physically combined together in a fixed amount by weight, to improve the physical and mechanical properties.

Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Which of the following is/are true about silver plating?

  1. The process of depositing a thin layer of silver electrolytically on metal surface is called silver plating.

  2. The article to be silver plated is made the anode

  3. Cathode consists of pure silver.
  4. The bath contains a solution of potassium argentocyanide $(AgNO _3+ \text { excess of KCN})$
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation

The following are true about silver plating.
The process of depositing a thin layer of silver electrolytically on metal surface is called silver plating.
The article to be silver plated is made the cathode.
Anode consists of pure silver.
The bath contains a solution of potassium argentocyanide $(AgNO _3+ \text { excess of KCN})$

Multiple choice chemistry chemistry of non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Match List - I (Position of the Metal in the Activity Series) with the List - II (Related Reduction Process) and select the correct option using the codes given below.

List - I(Position of the Metal in the Activity Series) List - II(Related Reduction Process)
(A) The bottom of the series (I) Electrolysis
(B) The top of the series (II) Reduction by heat alone
(C) The lower regions of the series (III) Found in native state
(D) The middle of the series (IV) Reduction using carbon or some other reducing agent
  1. $A - II, B - III, C - IV, D - I$
  2. $A - II, B - I, C - IV, D - III$
  3. $A - III, B - I, C - II, D - IV$
  4. $A - III, B - I, C - IV, D - II$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The metals which are placed high in the reactivity series are obtained by electrolysis, middle metals by reduction using carbon, lower by heating alone and metals at bottom of the series are found in native state.