Class 12th

Contributor-Level 10

Energy of the complex $\frac{}{}_{}$ $= - \frac{2}{5} * 4 ?_{0} + P$

For low spin $d^{4}$ $^{}$ cation

$= 1.6 ?_{0} + P$

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Compound A having molecular formula $C_{9} H_{10} O_{2}$ on reaction with dilute $H C l$ gives compound $X$ and $Y . X$ evolves $C O_{2}$ on reaction with aqueous $N a H C O_{3}$ and $Y$ gives yellow precipitate on reaction with $I_{2} / N a O H$ . Structure of compound $A$ is

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Contributor-Level 10

KIndly consider the following figure

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Class 12th Physics Nuclei

The missing particles or nuclides in the reactions? ${(p, α)}_{8}^{16} O$ and ${}_{7}^{14}{N {(?, p)}_{6}^{14} C}$ , respectively, are ( $p$ stands for proton and $α$ for alpha particle)

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Class 12th Physics Ray Optics and Optical Instruments

Contributor-Level 10

${}_{Z}^{A}{X + {}_{1}^{1}H \to {}_{2}^{4}{H e} + {}_{8}^{16}O}$

$Z + 1 = 2 + 8 ? Z = 9 X \to F$

$A + 1 = 4 + 16 \Rightarrow A = 19$

$\Rightarrow {}_{Z}^{A}X = {}_{9}^{19}F$

${}_{7}^{14}N + {}_{Z}^{A}Y \to {}_{1}^{1}H + {}_{6}^{14}C$

$7 + Z = 1 + 6 ? Z = 0$

$14 + A = 1 + 14 ? A = 1$

$? {}_{Z}^{A}Y = {}_{0}^{1}n$

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A small coin is resting on the bottom of a beaker filled with liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid?

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Raj Pandey

Contributor-Level 9

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Statement – I : Phenol is converted to benzene on heating with zinc dust.

Statement – II: Chromic acid oxidises phenol to benzoquinone.

In light of the above statements, choose the correct answer.

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Contributor-Level 10

Kindly consider the following figure

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Consider the following reaction sequence

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Contributor-Level 10

Kindly consider the following figure

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Class 12th Atoms

Which of the following is true?

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Contributor-Level 10

The spectrum of H-atom is formulated and drawn by Bohr's model. These spectrums are line spectrum. Lyman series lies in UV region, Balmer Partly lies UV and partly in the visible region and Paschen series lies in the infrared region.

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The compound which is most easily soluble in aqueous alkali is

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Contributor-Level 10

Sodium phenoxide is resonance stabilized hence phenol is most easily soluble in aqueous alkali.

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Class 12th Physics

Statement A: In intrinsic semiconductors, conductivity is mainly due to the breakage of covalent bonds.

Statement B: In extrinsic semiconductors, the conductivity is mainly due to the addition of impurities.

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Contributor-Level 10

In intrinsic semiconductors, conductivity is mainly due to breakage of covalent bonds in extrinsic semiconductors, the conductivity is due to the addition of impurities.

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Class 12th Physics

An AND gate can be prepared by repetitive use of

a) NOT gate (b) OR gate (c) NAND gate (d) NOR gate

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