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Test: Atomic & Molecular Mass (NCERT) - NEET MCQ


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5 Questions MCQ Test - Test: Atomic & Molecular Mass (NCERT)

Test: Atomic & Molecular Mass (NCERT) for NEET 2024 is part of NEET preparation. The Test: Atomic & Molecular Mass (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Atomic & Molecular Mass (NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Atomic & Molecular Mass (NCERT) below.
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Test: Atomic & Molecular Mass (NCERT) - Question 1
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The reference standard used for defining atomic mass is

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C-12 is used as a standard unit for defining atomic mass unit.

Test: Atomic & Molecular Mass (NCERT) - Question 2
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Atomic masses of elements are usually fractional because

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Atomic masses are the average atomic masses of the mixture of isotopes and calculated on the basis of relative abundance, hence they are usually fractional.

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Test: Atomic & Molecular Mass (NCERT) - Question 3
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Oxygen occurs in nature as a mixture of isotopes 16O, 17O, and 18O having atomic masses of 15.995 u, 16.999 u and 17.999 u and relative abundance of 99.763%, 0.037% and 0.200% respectively. What is the average atomic mass of oxygen?

Detailed Solution for Test: Atomic & Molecular Mass (NCERT) - Question 3

Atomic mass of oxygen
= 15.999 u

Test: Atomic & Molecular Mass (NCERT) - Question 4
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Calculate the molecular mass of sucrose(C12H22O11) molecule?
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Calculation of Molecular Mass of Sucrose
The individual mass of carbon is 12 amu, the individual mass of hydrogen is 1 amu & the individual mass of oxygen is 16 amu. But sucrose has 12 carbons, 22 hydrogens and 11 oxygens, that is 12 x 12 + 22 x 1 + 11 x 16 = 342 amu.

Test: Atomic & Molecular Mass (NCERT) - Question 5
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What mass of hydrochloric acid will contain the same number of hydrogen atoms as are present in 16 g of methane?
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