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Chemistry [1 Mark Question Answer]

Chemical Bonding · ICSE STD 10 (ICSE - English Medium). 27 questions.

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[1 Mark Question Answer]

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27 questions · timed · auto-graded

Question 31 Mark
The following table shows the electronic configuration of the elements W,X,Y,Z :
ElementWXYZ
Electronic
Configuration 		2,8,12,8,72,51
Answer the following questions based on the table above:
What is the formula of the compound formed between W and X.
Answer
WX is the formula of the compound formed between W and X.
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Question 41 Mark
The following table shows the electronic configuration of the elements W,X,Y,Z :
ElementWXYZ
Electronic
Configuration 		2,8,12,8,72,51
Answer the following questions based on the table above:
What is the formula of the compound formed between X and Z.
Answer
XZ is the formula of the compound formed between X and Z
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Question 51 Mark
The following table shows the electronic configuration of the elements W,X,Y,Z :
ElementWXYZ
Electronic
Configuration 		2,8,12,8,72,51
Answer the following questions based on the table above:
What type of bond is formed between Y and Z.
Answer
Covalent bond is formed between Y and Z
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Question 61 Mark
The following table shows the electronic configuration of the elements W,X,Y,Z :
ElementWXYZ
Electronic
Configuration 		2,8,12,8,72,51
Answer the following questions based on the table above :
What type of bond is formed between W and X
Answer
Electrovalent bond is formed between W and X
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Question 71 Mark
Which of the following is not a typical property of an ionic compound?
  • High melting point
  • Conducts electricity in the molten and the aqueous solution state.
  • Insoluble in water
  • Exist as oppositely charged ions even in the solid state
Answer
Insoluble in water is not a typical property of an ionic compound
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Question 81 Mark
Give suitable chemical terms for the bond formed by a shared pair of electrons with both electrons coming from the same atom.
Answer
Dative or coordinate bond
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Question 91 Mark
An element L consists of molecules.
Why L is heated with iron metal, it forms a compound FeL. What chemical term would you use to describe the change undergone by L?
Answer
Reduction
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Question 101 Mark
An element L consists of molecules.
What type of bonding is present in the particles that make up L?
Answer
Covalent bonding
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Question 111 Mark
Element $X$ is a metal with a valency $2$ ; $Y$ is a non-metal with a valency $3$.
(a) Write an equation to show how $Y$ forms as ion
(b) If $Y$ is a diatomic gas, write an equation for the direct combination of $X$ and $Y$ to form a compound.
Answer
(a) $Y +3 e ^{-} \rightarrow Y ^{3-}$
(b) $3 X+Y_2 \rightarrow X_3 Y_2$
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Question 121 Mark
Element $X$ is a metal with a valency $2$; $Y$ is a non-metal with a valency $3$.
(a) Write an equation to show how Y forms as ion
(b) If $Y$ is a diatomic gas, write an equation for the direct combination of $X$ and $Y$ to form a compound.
Answer
(a) $Y+3 e^{-} \rightarrow Y^{3-}$
(b) $3 X+Y_2 \rightarrow X_3 Y_2$
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Question 131 Mark
What are the terms defined in below : A bond formed by a shared pair of electrons with both electrons coming from the same atom.
Answer
A bond formed by a shared pair of electrons with both electrons coming from the same atom : Co-ordinate bond
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Question 141 Mark
What are the terms defined in below : A bond formed by a shared pair of electrons, each bonding atom contributing one electron to the pair.
Answer
A bond formed by a shared pair of electrons, each bonding atom contributing one electron to the pair : Covalent bond
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Question 151 Mark
In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound?
Answer
In the formation of covalent compound the electrons are shared between the combining atoms.
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Question 171 Mark
What is a lone pair of electrons?
Answer
A pair of electrons which is not shared with any other atom is known as lone pair of electrons.
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Question 181 Mark
Elements Q and S react together to form an ionic compound. Under normal conditions, which physical state will the compound QS exist in?
Answer
Solid
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Question 231 Mark
Give examples for the following:
Ionic chlorides of two different divalent metals.
Answer
$MgCl_2, CaCl_2.$
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Question 241 Mark
What type of bond is formed between two atoms, when the electronegative difference between them is zero ?
Answer
When the electro negativity difference between the two atoms is zero then the bond formed will be purely covalent.
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Question 251 Mark
What type of bond is formed between two atoms, when the electronegative difference between them is low ?
Answer
When the electro negativity difference between the two atoms is low then the bond formed will be polar covalent bond.
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Question 261 Mark
What type of bond is formed between two atoms, when the electronegative difference between them is High ?
Answer
When the electro negativity difference between the two atoms is high then the bond formed will be purely ionic.
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Question 271 Mark
Covalent compounds are generally gases or liquids or soft solids.
Answer
The forces of attraction between the molecules of covalent compounds are weak because the molecules are neutral. So, they are generally gases or liquids or soft solids.
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[1 Mark Question Answer] - Chemistry STD 10 Questions - Vidyadip