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HOLIDAY HOMEWORK Class 11

The document outlines holiday homework for Class XI Chemistry at Bishop Conrad Senior Secondary School, Bareilly. It includes various assignments related to atomic models, calculations involving isotopes, molecular formulas, and properties of solutions. Students are required to submit their completed assignments on the first day after the holidays.

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24 views1 page

HOLIDAY HOMEWORK Class 11

The document outlines holiday homework for Class XI Chemistry at Bishop Conrad Senior Secondary School, Bareilly. It includes various assignments related to atomic models, calculations involving isotopes, molecular formulas, and properties of solutions. Students are required to submit their completed assignments on the first day after the holidays.

Uploaded by

ankittpo
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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CHILD CARE BISHOP CONRAD SENIOR SECONDARY SCHOOL, BAREILLY

HOLIDAY HOMEWORK
CLASS XI
CHEMISTRY

Assignment - Explain model of atoms

QUESTIONS:

Q1 Define the following terms :


(a) Isotopes (b) Isobars (c) Isotones

Q2 Calculate the total number of electrons present in 1.6 g of methane.

Q3. How many molecules of aspirin (molar mass = 180 amu ) are present in 50 mg tablet ?

Q4 Which one of the following will have largest number of atoms ?

(i) 1 g Au (s) (ii) 1 g Na (s) (iii) 1g Li (s) (iv) 1g Cl 2 (g)

Q5 . The molecular mass of an organic compound is 78 and its percentage composition is

92.4 % C and 7.6% H .Determine the molecular formula of the compound .

Q6 . If 11g of oxalic acid are dissolved in 500 ml of solution ( density = 1.1 g ml-1 ) , What is
the mass percentage of oxalic acid in solution ?

Q7. 2.46 g of sodium hydroxide ( molar mass =40) are dissolved in water and the solution is
made to 100 cm3 in a volumetric flask . Calculate the molarity of the solution ?

Q8 The number of electrons , protons and neutrons in a species are equal to 18 ,16 and 16
respectively . Assign proper symbol to the species .

Q9 Yellow light emitted from a sodium lamp has a wavelength of 580 nm. Calculate the
frequency and wave number of this light.

Q10 The Vividh Bharti station of all india radio , Delhi Broadcasts on a frequency of 1368 kHz.
Calculate the wavelength of the electromagnetic radiation emitted by the transmitter .
Which part of the electromagnetic spectrum does it belong.

SUBMISSION GUIDELINES
Submit your complete assignment on the first day after the holidays
ALOK DWIVEDI
(PGT CHEMISTRY )

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