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CHEMISTRY [1 Mark Question Answer]

Atomic Structure and Chemical Bonding · ICSE STD 9 (ICSE - English Medium). 75 questions.

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[1 Mark Question Answer]

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Question 11 Mark
State the type of bond between $Y$ and $Z$ and give its molecular formula.
Answer
Ionic bond with molecular formula $ZY_2.$
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Question 21 Mark
Elements X, Y and Z have atomic numbers 6,9 and 12 respectively. Which one:
  1. Forms an anion
  2. Forms a cation
Answer
  1. Y = 9
  2. Z = 12
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Question 31 Mark
If electrons are getting added to en element Y; then
What charge will Y migrate to during the process of electrolysis?
Answer
Y will migrate towards the positive charge.
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Question 41 Mark
If electrons are getting added to en element Y; then
Is Y getting oxidized or reduced?
Answer
Electrons are getting added to element Y, so, it is getting reduced.
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Question 51 Mark
Match the atomic numbers 4,8,10,15 and 19 with each of the following:
An element which does not form ion
Answer
Atomic number 10
Electronic configuration (10): 2,8
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Question 61 Mark
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
Answer
Atomic number 8
Electronic configuration (8): 2,6
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Question 71 Mark
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with four shells
Answer
Atomic number 19
Electronic configuration (19): 2,8,8,1
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Question 81 Mark
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element which can form trivalent ion
Answer
Atomic number 15
Electronic configuration (15): 2,8,5
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Question 111 Mark
Name or state the following:

Elements having same mass number but different atomic number
Answer
${^{40}}_{18}Ar$ and ${^{40}}_{20}Ca$
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Question 121 Mark
Name or state the following:

Atoms of the same element differing in mass number
Answer
Hydrogen: ${^1}_1H, {^2}_1H, {^3}_1H$
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Question 161 Mark
What is the term defined below?
A bond formed by a shared pair of electrons, each bonding atom contributing one electron to the pair.
Answer
Single covalent bond
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Question 171 Mark
In the formation of magnesium chloride (by direct combination between magnesium and chlorine), name the substance that is oxidized and the substance that is reduced.
Answer
Magnesium is oxidised and chlorine is reduced.
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Question 181 Mark
The electronic configuration of nitrogen is (2, 5). How many electrons in the outer shell of a nitrogen atom are not involved in the formation of a nitrogen molecule?
Answer
Two
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Question 191 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
By mutual sharing of electrons
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Question 211 Mark
Identify the following reaction as either oxidation or reduction:
$Fe^{3+} + e^- → Fe^{2+}$
Answer
Reduction
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Question 271 Mark
An element $M$ burns in oxygen to form an ionic compound $MO$. Write the formula of the compounds formed if this element is made to continue with chlorine and sulfur separately.
Answer
Formula of compound when combined with sulphur $- MS$
Formula of compound when combined with chlorine $- MCl_2$
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Question 281 Mark
Define a covalent bond.
Answer
The chemical bond formed between two combining atoms by mutual sharing of one or more pairs of electrons is called a covalent bond.
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Question 291 Mark
Name two compounds that are covalent when taken pure but produce ions when dissolved in water.
Answer
$HCl$ and $NH_3$
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Question 301 Mark
An atom X has 2, 8, 7 electrons in its shell. It combines with Y having 1 electron in its outermost shell.
Write the formula of the compound formed.
Answer
XY
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Question 311 Mark
An atom X has 2, 8, 7 electrons in its shell. It combines with Y having 1 electron in its outermost shell.
What type of bond will be formed between X and Y?
Answer
Ionic bond
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Question 321 Mark
In the formation of the compound $XY_2,$ an atom $X$ gives one electron to each $Y$ atom. What is the nature of the bond in $XY_2?$
Answer
The nature of bond in $XY_2$ is an ionic bond.
Electron dot structure of $XY_2:$
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Question 331 Mark
An atom X has three electrons more than the noble gas configuration. What type of ion will it form?
Answer
An atom X will lose its three electrons to acquire the noble gas configuration and form a positive ion (a cation).
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Question 341 Mark
Define electrovalent bond.
Answer
The chemical bond formed due to the electrostatic force of attraction between a cation and an anion is called an electrovalent bond.
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Question 351 Mark
How do atoms attain noble gas configurations?
Answer
Combining atoms attain the noble gas configuration by transferring or sharing electrons.
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Question 361 Mark
Define the term:
orbit
Answer
Orbit is a circular path around the nucleus in which electrons of the atom revolve.
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Question 371 Mark
Define the term: Element
Answer
Element is a substance which cannot be split up into two or more simple substances by usual chemical methods of applying heat, light or electric energy; for example, hydrogen, oxygen and chlorine.
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Question 381 Mark
Define the term: Anion
Answer
Anion is a negatively charged ion which is formed when an atom gains one or more electrons; for example, $Cl^-$ and $I^-.$
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Question 391 Mark
Define the term: Cation
Answer
Cation is a positively charged ion which is formed when an atom loses one or more electrons; for example, $Na^+, Hg^{2+}$ and $Ca^{2+}.$
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Question 401 Mark
Define the term:
Ion
Answer
Ion is an atom or molecule which carries a positive or negative charge because of loss or gain of electrons.
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Question 411 Mark
Define the term:
Mass number
Answer
Mass number is the sum of the number of protons and the number of neutrons in the nucleus of an atom.
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Question 421 Mark
What is the significance of the number of protons found in the atoms of different elements?
Answer
The number of protons in the nucleus of an atom determines the element type of the atom.
Elements are arranged on the bases of number of protons in their respective atoms.
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Question 431 Mark
What are valence electrons?
Answer
Valence electrons: The number of electrons present in the valence shell is known as valence electrons.
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Question 441 Mark
Why do they exist as monoatoms in molecules?
Answer
These exist as monoatoms because molecules of these elements contain only one atom.
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Question 451 Mark
What are inert elements?
Answer
The elements have a complete outermost shell, i.e. 2 or 8 electrons. They ordinarily do not enter into any reaction.
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Question 471 Mark
Name the following:
Two atoms having the same number of protons and electrons but different number of neutrons.
Answer
Hydrogen and carbon
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[1 Mark Question Answer] - CHEMISTRY STD 9 Questions - Vidyadip