Assertion: Greenish layer appears on copper vessels if left uncleaned. Reason: It is due to the formation of layer of basic copper carbonate Give your correct option.

assertion and reason are correct and relevant to each other

assertion is true but reason is not relevant to the assertion

Chemistry: Periodic Classification Of Elements! Test

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Questions: 10 | Attempts: 1,932 | Updated: Mar 22, 2023

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Questions and Answers

1.

In the modern periodic table periods and groups are given. Periods and groups indicate ––––––
- A.
  
  Rows and Columns
- B.
  
  Columns and rows
Correct Answer
A. Rows and Columns

Explanation
In the modern periodic table, periods are the horizontal rows and groups are the vertical columns. Periods represent the number of energy levels an atom has, while groups represent the number of valence electrons an atom has. Therefore, the arrangement of periods and groups in the periodic table indicates the arrangement of elements in rows and columns.

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2.

Third period contains 8 elements, out of these elements how many elements are non-metals?
- A.
  
  4
- B.
  
  5
- C.
  
  6
- D.
  
  7
Correct Answer
B. 5

Explanation
The third period of the periodic table contains 8 elements. To determine how many of these elements are non-metals, we need to refer to the periodic table. Going from left to right in the third period, the elements are sodium (Na), magnesium (Mg), aluminum (Al), silicon (Si), phosphorus (P), sulfur (S), chlorine (Cl), and argon (Ar). Out of these, sodium, magnesium, aluminum, and silicon are metals, while phosphorus, sulfur, chlorine, and argon are non-metals. Therefore, there are 5 non-metals in the third period.

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3.

An element which is an essential constituent of all organic compounds belongs to _________ group.
- A.
  
  14 th group
- B.
  
  15 th group
Correct Answer
A. 14 th group

Explanation
The element that is an essential constituent of all organic compounds belongs to the 14th group. This is because the 14th group elements, also known as the carbon group, consist of carbon (C), silicon (Si), germanium (Ge), tin (Sn), and lead (Pb). Carbon is particularly important as it forms the backbone of organic compounds due to its ability to form strong covalent bonds with other elements. Therefore, the correct answer is the 14th group.

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4.

Ore is used for the extraction of metals profitably. Bauxite is used to extract aluminium, it can be termed as ________
- A.
  
  Ore
- B.
  
  Mineral
Correct Answer
A. Ore

Explanation
Bauxite can be termed as an ore because it is a naturally occurring mineral that contains a high concentration of aluminum. It is economically viable to extract aluminum from bauxite, making it a valuable source of the metal.

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5.

Gold does not occur in the combined form. It does not react with air (or) water. It is in ______
- A.
  
  Native state
- B.
  
  Combined state
Correct Answer
A. Native state

Explanation
Gold does not occur in the combined form because it does not react with air or water. Instead, it is found in its native state, meaning it is naturally found in its pure form without being chemically combined with other elements.

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6.

Assertion: Greenish layer appears on copper vessels if left uncleaned. Reason: It is due to the formation of layer of basic copper carbonate Give your correct option.
- A.
  
  Assertion and reason are correct and relevant to each other
- B.
  
  Assertion is true but reason is not relevant to the assertion
Correct Answer
A. Assertion and reason are correct and relevant to each other

Explanation
The greenish layer that appears on copper vessels is indeed due to the formation of a layer of basic copper carbonate. This occurs when copper reacts with oxygen, moisture, and carbon dioxide in the air. The resulting compound, basic copper carbonate, has a greenish color. Therefore, the assertion and reason are correct and relevant to each other.

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7.

A process employed for the concentration of sulphide ore is __________
- A.
  
  Froth floatation
- B.
  
  Gravity separation
Correct Answer
A. Froth floatation

Explanation
Froth flotation is a process used for the concentration of sulphide ore. It involves the separation of valuable minerals from gangue by creating a froth on the surface of the ore pulp. In this process, chemicals known as collectors are added to the ore pulp, which selectively attach to the surface of the valuable minerals, making them hydrophobic. Air bubbles are then introduced, which carry the hydrophobic minerals to the surface, forming a froth. The froth is then skimmed off, and the concentrated mineral particles are collected, while the gangue is left behind. This process is commonly used for the concentration of sulphide ores.

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8.

Coating the surface of iron with other metal prevents it from rusting. If it is coated with thin layer of zinc it is called _________
- A.
  
  Galvanization
- B.
  
  Painting
- C.
  
  Cathodic protection
Correct Answer
A. Galvanization

Explanation
Coating the surface of iron with a thin layer of zinc is called galvanization. Galvanization is a process where a protective layer of zinc is applied to the surface of iron or steel to prevent it from rusting. The zinc acts as a barrier between the iron and the surrounding environment, preventing the iron from coming into contact with moisture and oxygen, which are the main factors that cause rusting. Galvanization is commonly used in industries such as construction and automotive to protect iron and steel structures from corrosion.

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9.

Any metal mixed with mercury is called amalgam. The amalgam used for dental filling is _________
- A.
  
  Ag – Sn amalgam
- B.
  
  Cu – Sn amalgam
Correct Answer
A. Ag – Sn amalgam

Explanation
The correct answer is Ag - Sn amalgam because silver (Ag) and tin (Sn) are commonly used metals in dental amalgams. Ag - Sn amalgam is known for its good durability, strength, and resistance to corrosion, making it suitable for dental fillings. Copper (Cu) - Sn amalgam is not commonly used in dental fillings, making it an incorrect choice.

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10.

Assertion: In thermite welding, aluminium powder and Fe₂O₃are fused. Reason: Aluminium powder is a strong reducing agent. Does the reason satisfy the assertion?
- A.
  
  No
- B.
  
  Yes
Correct Answer
B. Yes

Explanation
The reason does satisfy the assertion. Thermite welding involves the use of a mixture of aluminium powder and iron oxide (Fe2O3) as the reactants. The aluminium powder acts as a strong reducing agent, meaning it has the ability to donate electrons and reduce the iron oxide. This reduction reaction leads to the fusion of aluminium and iron, resulting in the formation of molten iron and aluminium oxide. Therefore, the reason that aluminium powder is a strong reducing agent supports the assertion that aluminium powder and Fe2O3 are fused in thermite welding.

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Current Version
Mar 22, 2023

Quiz Edited by
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Dec 02, 2013

Quiz Created by
Padasalai10S

Chemistry: Periodic Classification Of Elements! Test

In the modern periodic table periods and groups are given. Periods and groups indicate ––––––

Third period contains 8 elements, out of these elements how many elements are non-metals?

An element which is an essential constituent of all organic compounds belongs to _________ group.

Ore is used for the extraction of metals profitably. Bauxite is used to extract aluminium, it can be termed as ________

Gold does not occur in the combined form. It does not react with air (or) water. It is in ______

Assertion: Greenish layer appears on copper vessels if left uncleaned. Reason: It is due to the formation of layer of basic copper carbonate Give your correct option.

A process employed for the concentration of sulphide ore is __________

Coating the surface of iron with other metal prevents it from rusting. If it is coated with thin layer of zinc it is called _________

Any metal mixed with mercury is called amalgam. The amalgam used for dental filling is _________

Assertion: In thermite welding, aluminium powder and Fe2O3 are fused. Reason: Aluminium powder is a strong reducing agent. Does the reason satisfy the assertion?

Assertion: In thermite welding, aluminium powder and Fe₂O₃are fused. Reason: Aluminium powder is a strong reducing agent. Does the reason satisfy the assertion?