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