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Class 9 Exam  >  Class 9 Tests  >  Science Olympiad Class 9  >  Olympiad Test: Atoms and Molecules- 2 - Class 9 MCQ

Olympiad Test: Atoms and Molecules- 2 - Class 9 MCQ


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10 Questions MCQ Test Science Olympiad Class 9 - Olympiad Test: Atoms and Molecules- 2

Olympiad Test: Atoms and Molecules- 2 for Class 9 2024 is part of Science Olympiad Class 9 preparation. The Olympiad Test: Atoms and Molecules- 2 questions and answers have been prepared according to the Class 9 exam syllabus.The Olympiad Test: Atoms and Molecules- 2 MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Atoms and Molecules- 2 below.
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Olympiad Test: Atoms and Molecules- 2 - Question 1
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The anion of an element has

Detailed Solution for Olympiad Test: Atoms and Molecules- 2 - Question 1
The anion of an element has a single negative charge. The VI A elements gain two electrons to form anions with a 2- charge.

For example, consider sodium cations (Na+) and Chloride anions (Cl−). Sodium has a positive 1 charge and chloride has a negative 1 charge.

The anion of an element has more electrons than the normal atom because it is formed by gaining electrons.

Olympiad Test: Atoms and Molecules- 2 - Question 2
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If the number of electrons in an ion Z3– is 10, the atomic number of element Z will be

Detailed Solution for Olympiad Test: Atoms and Molecules- 2 - Question 2

Z ⟶ Z3– means it gains three electrons

Atomic number = no. of electrons

So, the atomic number of element Z is = 7

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Olympiad Test: Atoms and Molecules- 2 - Question 3
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The smallest particle of a substance that is capable of independent existence is

Detailed Solution for Olympiad Test: Atoms and Molecules- 2 - Question 3
Atoms of the same element or different element are joined together to form molecules.

Molecules of an element or compound are the smallest particles that are capable of independent existence. They exhibit all the properties of the substance.

Olympiad Test: Atoms and Molecules- 2 - Question 4
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How many litres of ammonia are present in 3.4 kg of it? (N = 14, H = 1)
Detailed Solution for Olympiad Test: Atoms and Molecules- 2 - Question 4

Gram molecular weight of NH3 = 14 + (1 × 3) = 17 g

17 g of NH3= 22.4 litres

∴ 3.4 × 103g of NH = 22.4/17 × 3.4 × 103

= 76160/17 = 4480 litres

Olympiad Test: Atoms and Molecules- 2 - Question 5
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Two elements X and Y has valencies of 5 and 3, & 3 and 2, respectively. The elements X and Y are most likely to be, respectively
Detailed Solution for Olympiad Test: Atoms and Molecules- 2 - Question 5
Two elements X and Y have valencies of 5 and 3, and 3 and 2, respectively. The elements X and Y are most likely to be nitrogen and iron.
Olympiad Test: Atoms and Molecules- 2 - Question 6
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A particle P has 18 electrons, 20 neutrons and 19 protons. This particle must be
Detailed Solution for Olympiad Test: Atoms and Molecules- 2 - Question 6
No. of electron = No. of proton but in this case electron is less than proton. In cation also less

electrons are present than a neutral atom.

Olympiad Test: Atoms and Molecules- 2 - Question 7
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The cation of an element has
Detailed Solution for Olympiad Test: Atoms and Molecules- 2 - Question 7
Cations are positively charged ions. They are formed when a metal loses its electrons. They lose one or more than one electron and do not lose any protons. Therefore, they possess a net positive charge. Some examples of cations are Sodium (Na+), Potassium (K+), hydrogen (H+).
Olympiad Test: Atoms and Molecules- 2 - Question 8
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What will be the formula mass of CaCl2 (Ca = 40, Cl = 3.5)
Detailed Solution for Olympiad Test: Atoms and Molecules- 2 - Question 8
1 (Ca) + 2 (Cl) = 40 + 2 × 35.5

= 111 amu

Olympiad Test: Atoms and Molecules- 2 - Question 9
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Molecular compounds are usually formed by combination between
Detailed Solution for Olympiad Test: Atoms and Molecules- 2 - Question 9
The molecular compounds are formed by the combination of two or more non-metals by sharing their electrons to achieve an octet. The non-metals shared their electrons via covalent bonds.
Olympiad Test: Atoms and Molecules- 2 - Question 10
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The formula of a compound is X3Y. The valencies of elements X and Y will be, respectively
Detailed Solution for Olympiad Test: Atoms and Molecules- 2 - Question 10

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