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Class 12th

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Class 12th English

	S1	S2	S3	S4	S5	Total
A1	97	99	98		99	491
A2	92	95		94
A3	86	89		90	93	443
A4	78		76		85	405
A5		69	64	75		349
A6	49	53	48	60	55
Total	468		463	502	505

How much did A2 score in S5?

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Vishal Baghel

Contributor-Level 10

	S1	S2	S3	S4	S5	Total
A1	97	99	98	98	99	491
A2	92	95	92	94	98
A3	86	89	85	90	93	443
A4	78	81	76	85	85	405
A5	66	69	64	75	75	349
A6	49	53	48	60	55
Total	468	486	463	502	505

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New question posted

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Class 12th English

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a year ago

Class 12th Chemistry

Oxidation of toluene to benzaldehyde can be easily carried out with which of the following

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Payal Gupta

Contributor-Level 10

Kindly consider the below image

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New answer posted

a year ago

Class 12th Chemistry

The reaction of H₂O₂ with potassium permanganate in acidic medium leads to the formation of mainly.

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alok kumar singh

Contributor-Level 10

$2 M n O_{4}^{-} + 6 H^{+} + 5 H_{2} O_{2} \to 2 M n^{2 +} + 8 H_{2} O + 5 O_{2}$

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Class 12th Chemistry

The compound(s) that is (are) removed as slag during the extraction of copper is:

(A) CaO

(B) FeO

(C) Al₂O₃

(D) ZnO

(E) NiO

Choose the correct answer from the options given below.

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

$F e O + \underset{(A c i d i c f l u x)}{S i O_{2}} \to \underset{(S l a g)}{F e S i O_{3}}$

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Class 12th Chemistry

The correct order of nucleophilicity is

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Payal Gupta

Contributor-Level 10

Nucleophilicity is directly proportional to the electron density of atom and inversely proportional to its electronegativity.

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a year ago

Class 12th Chemistry

The IUPAC nomenclature of an element with electronic configuration [Rn] 5f¹⁴6d¹7s² is:

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alok kumar singh

Contributor-Level 10

IUPAC nomenclature of element with atomic no. 103 is uniltrium.

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Class 12th Chemistry

The major product in the following reaction

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Payal Gupta

Contributor-Level 10

Kindly consider the below image

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New answer posted

a year ago

Class 12th Chemistry

Match the List-I with List-II

List-I	List-II
(A) N₂(g) + 3H₂(g) -> 2NH₃(g)	(I) Cu
(B) CO(g) + 3H₂(g) -> CH₄(g) + H₂O(g)	(II) Cu/ZnO – Cr₂O₃
(C) CO(g) + H₂(g) -> HCOH(g)	(III) Fe_xO_y + K₂O + Al₂O₃
(D) CO(g) + 2H₂(g) -> CH₃OH(g)	(IV) Ni

Choose the correct answer from the options given below:

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alok kumar singh

Contributor-Level 10

Uses of catalyst is very specific for a particular reaction.

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Class 12th Chemistry Solutions

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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alok kumar singh

Contributor-Level 10

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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