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Test: Atomic And Molecular Mass - Class 9


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10 Questions MCQ Test Science Class 9 - Test: Atomic And Molecular Mass

Test: Atomic And Molecular Mass for Class 9 2023 is part of Science Class 9 preparation. The Test: Atomic And Molecular Mass questions and answers have been prepared according to the Class 9 exam syllabus.The Test: Atomic And Molecular Mass MCQs are made for Class 9 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Atomic And Molecular Mass below.
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Test: Atomic And Molecular Mass - Question 1
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Which of the following is correct pair of elements and its symbol?

Detailed Solution for Test: Atomic And Molecular Mass - Question 1

As we know, in the periodic table; 
The symbol S  is used for sulphur 
The symbol Ag is used for silver
The symbol Na is used for sodium
The symbol K  is used for potassium
So, option ( d) is the correct✔ answer.

Test: Atomic And Molecular Mass - Question 2
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Valency of hydrogen is 1 and that of sulphur is 2. What should be the formula of hydrogen sulphide?​

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Hydrogen sulfide is the chemical compound with the chemical formula H2S. It is a colorless gas with the characteristic foul odor of rotten eggs. It is very poisonous, corrosive, and flammable.

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One atomic mass unit is a mass unit equal to exactly one twelfth (1/12th) the mass of one atom of ___________.

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An atomic mass unit is defined as a mass equal to one twelfth the mass of an atom of carbon 12. The mass of any isotope of any element is expressed in relation to the carbon 12 standard.

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Which of the following is the correct IUPAC symbol for the element Cobalt?
Detailed Solution for Test: Atomic And Molecular Mass - Question 4
The wrong thing in writing cobalt as CO is that we can't write o as O because O represent Oxygen and symbols representing an element with two letters have first one as capital and next one should be in small letter.
Therefore we should always write cobalt as..Co not CO!

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Which one of the following is the modern symbol of Gold?
Detailed Solution for Test: Atomic And Molecular Mass - Question 5
Gold is a chemical element with symbol Au (from Latin: aurum) and atomic number 79, making it one of the higher atomic number elements that occur naturally. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal.
Test: Atomic And Molecular Mass - Question 6
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An atom has a mass number of 23 and atomic number 11. The number of protons are ________.
Detailed Solution for Test: Atomic And Molecular Mass - Question 6

A neutral atom will have the samenumber of electrons is does protons. Since it has an atomic number of 11 it must have 11 protons. Since it has anatomic mass of 23 it must have 12 neutrons.

Test: Atomic And Molecular Mass - Question 7
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NaCl molecule is made of which of the following ions?
Detailed Solution for Test: Atomic And Molecular Mass - Question 7
An oxygen molecule (O2) is a good example of a molecule with a covalent bond. Ionic bonds occur when electrons are donated from one atom to another. Table salt (NaCl) is a common example of a compound with an ionic bond.
Test: Atomic And Molecular Mass - Question 8
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Valency of Calcium element is:
Detailed Solution for Test: Atomic And Molecular Mass - Question 8

The valency of Calcium of 2+. Calcium has 2 electrons in its outermost shell, its electronic configuration being (2,8,8,2). In order to attain stability it loses 2 electrons to become stable according to the octet rule.

Test: Atomic And Molecular Mass - Question 9
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Chemical formula of a compound is A2B3. The valency of A is
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Test: Atomic And Molecular Mass - Question 10
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What is the atomic mass of nitrogen?
Detailed Solution for Test: Atomic And Molecular Mass - Question 10
Atomic Mass is determined by total number of nucleons in nucleus. Total number of nucleons is equal to sum of proton and neutrons in a atom .So, number of protons in Nitrogen is 7 as well as Neutron present are also 7. As 7 +7 is 14, the atomic mass is 14 u,(small u) is the atomic mass unit .
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