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Assignment-2-Mole Concept

This chemistry assignment from Vishwa Bharati Public School for Class 11 covers the mole concept topic. It contains 15 multiple choice questions calculating moles, atoms, molecules, and mass relationships. Example questions include calculating the atomic weights of elements from given mole and mass data, determining which choices have the largest number of water molecules or copper atoms, and calculating the number of molecules and atoms in various amounts of gases and compounds.

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126 views2 pages

Assignment-2-Mole Concept

This chemistry assignment from Vishwa Bharati Public School for Class 11 covers the mole concept topic. It contains 15 multiple choice questions calculating moles, atoms, molecules, and mass relationships. Example questions include calculating the atomic weights of elements from given mole and mass data, determining which choices have the largest number of water molecules or copper atoms, and calculating the number of molecules and atoms in various amounts of gases and compounds.

Uploaded by

divyanshgirivbps
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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VISHWA BHARATI PUBLIC SCHOOL, NOIDA

CLASS: XI (2022-23)
SUBJECT: CHEMISTRY

Unit-1: Basic Concepts of Chemistry Assignment No.-2

Topic: Mole Concept Prepared by: Manisha Sareen

1. Elements X and Y combine to form two compounds XY and X2Y. Find the atomic
weight of X and Y, if the weight of 0.1 moles of XY is 10g and 0.05 moles of X2Y is 9g
(a) 30, 20
(b) 80, 20
(c) 60, 40
(d) 20, 30

2. Which one will have maximum numbers of water molecules?


(a) 18 molecules of water
(b) 1.8 grams of water
(c) 18 grams of water
(d) 18 moles of water

3. The number of atoms present in 0.1 moles of a triatomic gas is


23
(a) 1.806 × 10
22
(b) 1.806 × 10
23
(c) 3.600 × 10
22
(d) 6.026 × 10

4. Find the volume of O2 required to burn 1 L of propane completely, measured at 0℃


temperature and 1 atm pressure
(a) 10 L
(b) 7 L
(c) 6 L
(d) 5 L

5. 16 g of oxygen has same number of molecules as in


(a) 16 g of CO
(b) 28 g of N2
(c) 14 g of N2
(d) 1.0 g of H2

6. The number of Gram molecules of oxygen in 6.02×1024 CO molecules is


(a) 10 gm-molecules
(b) 5 gm-molecules
(c) 1 gm -molecules
(d) .5 gm-molecules

Vbpsnoida/XI/2022-23
7. Which of the following has the largest number of atoms
(a)0.5 g-atoms of Cu
(b)0.635 g Cu
(c) 0.25moles of Cu atoms
(d)1g of Cu

8. 1 Mole of CH4 contains


(a) 6.02×1023 atoms of H
(b) 4 gm-atoms of hydrogen
(c) 1.81×1023 molecules of CH4
(d) 3g of Carbon

9. Calculate the number of oxygen atoms in 50 g of CaCO3.


(a) 6.033×1023 atoms
(b) 9.033×1023 atoms
(c) 8.033×1023 atoms
(d) 3.033×1023 atoms

10. Which of the following pairs have the same number of atoms?
(a) 16 g of O2(g) and 4 g of H2(g)
(b) 16 g of O2 and 44 g of CO2
(c) 28 g of N2 and 32 g of O2
(d) 12 g of C(s) and 23 g of Na(s)

11.Calculate the number of atoms of each type in 5.3 g of Na CO .


2 3
12. Calculate the number of molecules and no. of atoms present in 11.2 L. of oxygen at N.T.P

13.What is mass of carbon present in 0.5 mole of K [Fe (CN)


4 6
14.How many molecules of water and oxygen atoms are present in 0.9 g of H O?
2
15.How many electrons are present in 1.6 gm of CH ?
4

Vbpsnoida/XI/2022-23

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