$ ( \sigma ) $

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Which row of the table is correct?

	Shape	Shape	Bonds present	Bonds present
	Ammonia molecule	Ammonium ion	Ammonia molecule	Ammonium ion
A	Pyramidal	Regular tetrahedral	$$\sigma$$	$$\sigma$$
B	Pyramidal	Regular tetrahedral	$$\sigma$$	$$\pi$$
C	Regular tetrahedral	Pyramidal	$$\sigma$$	$$\sigma$$
D	Regular tetrahedral	Pyramidal	$$\pi$$	$$\sigma$$

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C_{3}^{4 -}

has

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Match the following :
List I
1. Correlation in Bivariable Frequency table.
2. Probable error and co-efficient correlation.
3. Rank correlation.
4. Karl pearson's co-efficient of correlation.
List II
a)

\frac{Σ f d x d y - \frac{Σ f d x Σ f d y}{N}}{\sqrt{Σ f d x^{2} - \frac{(Σ f d x)^{2}}{N}} \sqrt{Σ f d y^{2} - \frac{(Σ f d y)^{2}}{N}}}

r = 0.6745 \frac{{- r}^{2}}{\sqrt{N}}

r = 1 - \frac{6 Σ d^{2}}{n (n^{2} - 1)}

r = \frac{Σ x y}{N σ x σ y}

Codes :
1 2 3 4

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Three concentric metal shells

A, B

and

C

of respective radii

a, b

and

c (a < b < c)

have surface charge densities

+ σ, - σ

and

+ σ

respectively. The potential of shell

B

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Which is correct relation. (

σ

is Poisson's Ratio, Y is the young's Modulus)

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\( ( \sigma ) \)