Chemistry

Heating white phosphorous with conc. NaOH solution gives mainly:

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Contributor-Level 10

P₄ + 3NaOH + 3H₂O -> 3NaH₂PO₂ + PH₃

(It's a disproportionation reaction)

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Match the List-I with List-II

List – II List – II

(Si-Compounds) (Si-polymeric / Other Products)

(A) &n

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Chemistry The S-block Elements

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(CH₃)₄Si is called silane, while CH₃Si (OH)₃ produced 2- dimensional silicone after the removal of water, similarity ${(C H_{3})}_{2} S i {(O H)}_{2}$ produced chain form and ${(C H_{3})}_{3} S i (O H)$ produced dimer form after releasing water molecules.

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BeCl₂ reacts with LiAlH₄ to give:

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Reaction of BeCl₂ and LiAlH₄

2BeCl₂ + LiAlH₄ -> 2BeH₂ + LiCl + AlCl₃

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Addition of H₂SO₄ to BaO₂ produces:

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BaO₂ + H₂SO₄ BaSO₄ + H₂O₂

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Math the List-I with List-II

List – I List – II

(A) Concentration of gold ore &nbs

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Cyanidation is applicable for gold extraction, leaching for NaOH, froth stabilizer is aniline and blister copper is related with SO₂.

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Chemistry Class 11th

Given below are two statement: one is labeled as Assertion (A) and the other is labeled as Reason (R)

Assertion (A) : The ionic radii of O²⁺ and Mg²⁺ are same

Reason (R) : Both O²⁺ and Mg²⁺ are isoelectronic species

In the light of the above statement, choose the correct answer from the options below.

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Contributor-Level 10

Ionic radius of isoelectronic species depends upon $\frac{Z}{e}$ $\frac{}{}$ ratio; Hence Ionic radius of $O^{- -} >$ $^{}$ ionic radius of Mg+

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Match the List-I with List-II

List – I List – II

(A) Lyophilic colloid

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Emulsion are liquid colloids, protective colloids are lyophilic, FeCl3 + H2O $\overset{Δ}{\to} (+ v e) l y$ charged colloids and FeCl3 + NaOH $\to_{}^{}$ (-ve)ly charged colloids.

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Chemistry Thermodynamics

Match the List-I with List-II

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Chemistry Chemical Bonding and Molecular Structure

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For spontaneous process $Δ G < 0$

For Isobaric process; $Δ P = 0$

For Isothermal process; $Δ T = 0$

$Δ H$ reaction = $\sum_{}^{} B . E_{(R)} . - {\sum_{}^{} B . E .}_{(P)}$

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Based upon VSEPR theory, match the shape (geometry) of the molecules in List-I with the molecules in List-II and select the most appropriate option.

List -I List – II

(Shape)

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Contributor-Level 10

Kindly consider the following figure

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Chemistry Solutions

Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R)

Assertion (A): At 10°C, the density of a 5M solution of KCl [atomic masses of K % Cl are 39 & 35.5 g mol^-¹ respectively is 'x' g ml^-¹. The solution is cooled to -21°C. The molality of the solution will remain unchanged.

Reason (R) : The molality of a solution does not change with temperature as mass remains unaffected with temperature

In the light of the above statements, choose the correct answer from the options given below.

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