Cesium atoms are the largest neturally o...

Cesium atoms are the largest neturally occurring atoms. The radius of `Cs` atom is `2.6 Å`. The number of moles of `Cs` atoms to be laid side by side to give a row of `Cs` atoms `2.5 cm` long is `x xx 10^(-17)`. Find the value of `x`.

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The correct Answer is:

Statement (a), (b), and (d) are correct.
a. So total score `= 4 + 3 + 1 = 8`
Nearest neighbour of atom `2` are `1` and 3.
Distance between atoms `1` and `2 = a`
Distance between atoms `2` and `3 = sqrt(2)a`

b. Nearest neighbours of atom `D` are E and F (F atom is in body centre)
Body diagonal `(AD) = (sqrt(3))/(4)a`
Distance `DF = 1/2 (AD) = (sqrt(3))/(2)a`

Distance `ED = a`.
c. Optiion (c) is wrong. `ZnS` (wurtzite) and `ZnS` (zinc blende) are polymorphisum.
But in both the compounds, cations `Zn^(2+)` ions occupy alternate `TVs`. ltbr In both compounds, `S^(2-)` occupied lattice points.
d. Correct statement.

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The number of mole of N - atom in 18.066 x 10 ^(23) nitrogen atoms is

1 mol

2 mol

3 mol

4 mol

If the diameter of carbon atom is 0.15nm , the number of carbon atoms which can be placed side by side is a straight line across length of 10.0cm is

`66.66 xx 10^(7)`

`66.66 xx 10^(8)`

`6.2 xx 10^(9)`

`1.33 xx 10^(7)`

The IE_(1) of Cs is 376 kj/mole . The number of Cs atoms that can be converted to Cs^(+) ions by 1J energy is

`1.60 xx 10^(18)`

`6.023 xx 10^(18)`

`1.505 xx 10^(23)`

`3.011 xx 10^(18)`