Home
Class 12
CHEMISTRY
The answer to each of the following ques...

The answer to each of the following questions is a single digit integer, ranging from 0 to 9. If correct answers to the question number A,B,C and D (say) are 4,0,9 and 2 respectively, then correct darkening of bubbles should be as shown on the side.
(A) Silver (atomic weight = 108 g `mol^(-1)`) has a density of 10.5 g `cm^(-3)`. The number of silver atoms on a surface are of `10^(-12) m^(2)` can be expressed in scientific notation as `yxx10^(x)`. The value x is ...........

Text Solution

Verified by Experts

The correct Answer is:
7
Volume of 1 mole of Ag aotms `=(108)/(10.5)cm^(3)`
Volume of one Ag atom `=(108)/(10.5xx6.023xx10^(23))`
`=(4)/(3)pir^(3)`
or `r=1.6xx10^(-8)cm=1.6xx10^(-10)m`
where r is the radius of Ag atom
Area occupied by one Ag atom `=pir^(2)`
`=3.14xx(1.6xx10^(-10))^(2)m^(2)`
`:.` no. of Ag atoms of the surface area of `10^(-12)m^(2)`
`=(10^(-12))/(3.14xx(1.6xx10^(-10))^(2))=1.27xx10^(7)`
=x=7
Promotional Banner

Topper's Solved these Questions

  • SOME BASIC CONCEPTS OF CHEMISTRY

    DINESH PUBLICATION|Exercise REASON ASSERTION TYPE MCQs|11 Videos

  • SOME BASIC CONCEPTS OF CHEMISTRY

    DINESH PUBLICATION|Exercise ULTIMATE PREPARATORY PACKAGE|20 Videos

  • SOME BASIC CONCEPTS OF CHEMISTRY

    DINESH PUBLICATION|Exercise MATRIX MATCH TYPE MCQs|2 Videos

  • SOLUTIONS

    DINESH PUBLICATION|Exercise ULTIMATE PREPARATORY PACKAGE|10 Videos

  • SURFACE CHEMISTRY

    DINESH PUBLICATION|Exercise BRAIN STORMING MULTIPLE CHOICE QUESTIONS (MCQs)|8 Videos

Similar Questions

Explore conceptually related problems

Silver (atomic weight 108 g mol^(-1)) has a density of 10.5 g cm^(-3) . The number of silver atoms on a surfaces of area 10^(-12) m^(2) can be expressed in scientific notation as Y xx 10^(-x) , The value of x is …….

Silver (atomic weight =108gmol^(-1) ) has a density of 10.5gcm^(-3) .The number of silver atoms on a surface of area 10^(-12)m^(2) can be expressed in scientific notation as y times10^("x") .The value of "x" is

Knowledge Check

  • The answer to each of the following question is a single digit integer, ranging from 0 to 9. if the correct answers to the question number A,B,C and D (say ) are 4,0,9 and 2 respectively. Then the correct correct darkening of bubbles should be as shown on the side.

    A
    In Mg-Al cell, the number of electrons involved in the cell reaction i s
    B
    0.25 mole of propane is subjected to combustion. If this reaction is used for making a fuel, cell the number of moles of electrons involved in each half cell for this amount of propane will be
    C
    Three litres of 0.5M `K_(2)Cr_(2)O_(7)` solution have to be completely reduced in the acidic medium. The number of faradays of electricity required will be
    D
    For the Mg-Ag cell, how many times the difference between the EMF of the cell and its standard EMF will change if concentration of `Mg^(2+)` ions changed to 0.1M and that of `Ag^(+)` ions is changed from 0.5M to 0.25M.