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Chemistry Class 12th

Match list – I with List – II.

List – I List – II

(Ore) (Element Present)

(A) Kernite (i) Tin

(B) Cassiterite &nb

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Payal Gupta

Contributor-Level 10

Kernite $(N a_{2} B_{4} O_{7} . 4 H_{2} O) \to$ it is ore of boron

Cassiterite (SnO₂) → it is ore of tin

Calamine (ZnCO₃) → it is ore of zinc

Cryolite (Na₃AlF₆) → it is ore fluorine

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Chemistry Class 12th

Which of the following is 'a' FALSE statement?

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Payal Gupta

Contributor-Level 10

Option (A) is false statement because estimation of nitrogen in an organic compound is done by Kjeldahl's method.

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Chemistry Class 12th

The structure of Neopren is

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Chemistry Class 12th

Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound A is

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Payal Gupta

Contributor-Level 10

PbO₂ is used is lead storage battery and is amphoteric as strong oxidizing agent since Pb (II) is more stable than Pb (IV).

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Chemistry Class 12th

Find A, B and C in the following reactions:

NH₃ + A + CO₂ → (NH₄)₂ CO₃

(NH₄)₂ CO₃ + H₂O + B → NH₄ HCO₃

NH₄HCO₃ + NaCl → NH₄Cl + C

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Payal Gupta

Contributor-Level 10

$N H_{3} + \underset{A}{H_{2} O} + C O_{2} \to {(N H_{4})}_{2} C O_{3}$

${(N H_{4})}_{2} C O_{3} + H_{2} O + \underset{B}{C O_{2}} \to N H_{4} H C O_{3}$

$N H_{4} H C O_{3} + N a C l \to N H_{4} C l + \underset{C}{N a H C O_{3}}$

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Chemistry Class 12th

Find A, B and C in the following reactions:

NH₃ + A + CO₂ → (NH₄)₂ CO₃

(NH₄)₂ CO₃ + H₂O + B → NH₄ HCO₃

NH₄HCO₃ + NaCl → NH₄Cl + C

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Chemistry Structure of Atom

The orbital having two radial as well as two angular nodes is

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Payal Gupta

Contributor-Level 10

Radial node = n $l -$ 1 (5d)

= 5 – 2 – 1 = 2

Angular node = $l$

= 2

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Chemistry Class 12th

For the given reaction

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Payal Gupta

Contributor-Level 10

Refer to the image below

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Chemistry Class 12th

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Payal Gupta

Contributor-Level 10

Kindly refer to below image

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Chemistry Class 12th

An amine on reaction with benzenesulphonyl chloride produces a compound insoluble in alkaline solution. This amine can be prepared by ammonolysis of ethyl chloride. The correct structure of amine is

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