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Test: Atoms And Molecules - 1 - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Atoms And Molecules - 1

Test: Atoms And Molecules - 1 for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: Atoms And Molecules - 1 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Atoms And Molecules - 1 MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Atoms And Molecules - 1 below.
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Test: Atoms And Molecules - 1 - Question 1

If 9g of water is decomposed, it is always obtained –

Detailed Solution for Test: Atoms And Molecules - 1 - Question 1

The correct answer is (b) 1 g of hydrogen and 8 g of oxygen. This is because water (H2O) consists of two hydrogen atoms and one oxygen atom. By mass, hydrogen contributes approximately 11.1% and oxygen contributes approximately 88.9% to the mass of water. Thus, from 9g of water, we get approximately 1 g of hydrogen and 8 g of oxygen.

Test: Atoms And Molecules - 1 - Question 2

The symbol of the element ‘cobalt’ is

Detailed Solution for Test: Atoms And Molecules - 1 - Question 2

The correct answer is (b) Co. The symbol for the element cobalt is "Co" according to the periodic table.

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Test: Atoms And Molecules - 1 - Question 3

If 7g of carbon monoxide (CO) is decomposed, it is always obtained –

Detailed Solution for Test: Atoms And Molecules - 1 - Question 3

The correct answer is (a) 3g of carbon and 4g of oxygen. In carbon monoxide (CO), one carbon atom combines with one oxygen atom. The molar mass of CO is 12g/mol + 16g/mol = 28g/mol. Since the total mass is 7g, it means we have approximately 0.25 moles of CO. For each mole of CO decomposed, we obtain 1 mole of carbon and 1 mole of oxygen. Hence, from 0.25 moles of CO, we get approximately 0.25 moles of carbon and 0.25 moles of oxygen, which translates to 3g of carbon and 4g of oxygen.

Test: Atoms And Molecules - 1 - Question 4

1.0 mole CO2 contains

Detailed Solution for Test: Atoms And Molecules - 1 - Question 4
  • One mole of CO2 = one mole of C = 6.02×1023 atoms of carbon.
  • One mole of CO2 = two moles of O = 2×6.02×1023= 12.04×1023 atoms of oxygen.
  • One mole of CO2​ = 6.02×1023 molecules of CO2

Note: 6.02×1023 is Avogadro's number and represents number of atoms/molecules present in one mole of substance.

Test: Atoms And Molecules - 1 - Question 5

Identify the correct symbol of Gold. 

Detailed Solution for Test: Atoms And Molecules - 1 - Question 5

The chemical symbol for gold is Au, taken from the Latin word for gold- Aurum. Its atomic number is 79.

Test: Atoms And Molecules - 1 - Question 6

Which of the following is atomic mass unit of chlorine?

Detailed Solution for Test: Atoms And Molecules - 1 - Question 6

The correct answer is (d) 35.5. The atomic mass unit (amu) of chlorine is approximately 35.5 g/mol. This is the average atomic mass of chlorine isotopes based on their natural abundance.

Test: Atoms And Molecules - 1 - Question 7

The combining capacity of an element is called 

Detailed Solution for Test: Atoms And Molecules - 1 - Question 7
  • The combining capacity of an element is known as its valency.
  • Valency is the number of valence electrons in outer shell that take part in the chemical reaction.
Test: Atoms And Molecules - 1 - Question 8

One atomic mass unit of carbon-12 is

Detailed Solution for Test: Atoms And Molecules - 1 - Question 8

One atomic mass unit is defined as one-twelfth of the one-carbon of one carbon - 12 atom because C - 12 is chosen as the standard form.

Test: Atoms And Molecules - 1 - Question 9

Which is not represented by 1 mole of nitrogen gas? 

Detailed Solution for Test: Atoms And Molecules - 1 - Question 9

1 gram - atom nitrogen corresponds to mass of one mole of the nitrogen atom is grams that is one gram - atom of nitrogen represents 28 gms of nitrogen. 
It is equal to 6.023 * 1023 N atoms, but not  
6.023 * 1023 N2 molecules.
 

Test: Atoms And Molecules - 1 - Question 10

Symbol for Hydrogen as proposed by Dalton was –

Detailed Solution for Test: Atoms And Molecules - 1 - Question 10
Symbol for Hydrogen as proposed by Dalton

  • Option A: This symbol is not the correct symbol proposed by Dalton for Hydrogen.

  • Option B: This symbol is not the correct symbol proposed by Dalton for Hydrogen.

  • Option C: This symbol is the correct symbol proposed by Dalton for Hydrogen. It consists of a circle with a dot in the center.

  • Option D: This symbol is not the correct symbol proposed by Dalton for Hydrogen.


Therefore, the correct symbol for Hydrogen as proposed by Dalton is option C, which is a circle with a dot in the center. This symbol has been widely accepted and used to represent Hydrogen in chemical equations and formulas.

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