Ncert Solutions Chemistry Class 12th

Which of the following is an example of ferromagnetic substance?

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Fe₃O₄ is a ferromagnetic substance

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Which among the following is malachite?

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Malachite : CuCO3.Cu (OH)2

Azurite : 2CuCO3.Cu (OH)2

Cuprite : Cu₂O

Copper pyrite : Cu₂S.Fe₂S₃.

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The correct relationship between edge length (a) and radius of atom (r) for BCC unit cell is

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For BCC unit cell

$\sqrt[]{3} a = 4 r$

$a = \frac{4 r}{\sqrt[]{3}}$

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Packing efficiency of fcc lattice is

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For FCC lattice,

Packing efficiency = π/3√2

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The first co-ordination number of Cs⁺ in CsCl lattice is

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CsCl has BCC structure in which Cl^- is present at corners of cube and Cs+ at body centre.

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From a sprinkler of length $1 m$ , water is throw out with $0.5 m / s$ tangentially at the rate of $0.6 k g / m i n$ . If diameter of sprinkler is $8 c m$ and moment of inertia is $500 g c m^{2}$ , the rate at which angular speed of sprinkler will increases is (assume there in no resistance to motion)

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Angular momentum imparted to sprinkler per

$s e c o n d = v r \frac{d m}{d t} = \frac{0.6}{60} * 0.5 * 1 = 0.005 N . m$

$? l \frac{d ω}{d t} = 0.005$

$? \frac{d ω}{d t} = \frac{0.005}{500 * 10^{- 7}}$

$= 100 \frac{r a d}{s^{2}}$

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A prism has refracting angle of 30⁰ and it is made of glass of refractive index $\sqrt[]{2}$ . At what angle should a light ray be incident on a face of prism such that it passes normally through the other face?

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Ncert Solutions Chemistry Class 12th Chemistry Organic Chemistry

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For normal emergence

$r = A$

From Snell's Law

$\frac{\sin ? i}{\sin ? r} = \frac{μ}{1}$

$? \sin ? i = \sqrt[]{2} \sin ? 30^{0}$

$? i = 45^{0}$

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Consider the following chemical reaction.

$H C \equiv C H \to_{2) C O, H C l, A l C l_{3}}^{1) R e d h o t F e t u b e, 873 K} P r o d u c t$

The number of sp² hybridized carbon atoms (s) present in the product is--------------.

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Kindly consider the following figure

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Using the provided information in the following paper chromatogram: Fig : Paper chromatography for compounds A and B. The calculated R_f value of A------------* 10^-1.

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$R_{f} v a l u e = \frac{D i s t a n c e m o v e d b y s u b s t a n c e f r o m b a s e l i n e}{D i s t a n c e m o v e d b y t h e s o l v e n t f r o m b a s e l i n e} = \frac{2}{5} = 0.4 = 4.0 * 1 0^{- 1}$

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The total number of amines among the following which can be synthesized by Gabriel synthesis is………………

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