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Ncert Solutions Chemistry Class 12th

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Ncert Solutions Chemistry Class 12th Class 12th

The depression in freezing point observed for a formic acid solution of concentration 0.5 mL L^-1 is $0.0405 ° C .$ Density of formic acid is 1.05 g mL^-1. The Van't Hoff factor of the formic acid solution is nearly: (Given for water $K_{f} = 1.86 k k g m o l^{- 1}$ )

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Raj Pandey

Contributor-Level 9

Let we take $1 l$ of solution

Mass of solute = Volume * Density

= 0.5 $m l * 1.05 g m / m l$

= 0.525 gram

Mass of solution = 1 kg. [considering very dilute solution]

Mass of solvent = 1000 – 0.525 = 999.475 gram

$\Rightarrow i = 1.9$

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Ncert Solutions Chemistry Class 12th Class 12th

The highest industrial consumption of molecular hydrogen is to produce compounds of element :

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Raj Pandey

Contributor-Level 9

The highest industrial consumption of hydrogen gas is in the synthesis of ammonia gas (Having manufacturing of N-based fertizers)

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Ncert Solutions Chemistry Class 12th Class 12th

The energy of one mole of photons of radiation of wavelength 300nm is (Given: h = 6.63 * 10³⁴ Js,N_A = 6.02 * 10²³ mol^-1 c = 3 * 10⁸ ms^-1)

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Raj Pandey

Contributor-Level 9

Energy of 1 photon = $\frac{h c}{λ}$

Energy of 1 mole of photon = $N_{A} * \frac{h c}{λ}$

$= \frac{6.022 * 1 0^{23} * 6.63 * 1 0^{- 34} * 3 * 1 0^{8}}{300 * 1 0^{- 9}}$

=0.399 * 10⁶ J = 399KJ

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Ncert Solutions Chemistry Class 12th Class 12th

How many hydrogen atom(s) is/are present in precipitate (P)?

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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Ncert Solutions Chemistry Class 12th Class 12th

A metal crystallises as simple cubic crystal. The distance between the nearest neighbours of each atom is $\frac{258.36}{\sqrt[]{2}} p m .$ The atomic radius of metal atoms (in pm) is