Chemistry

Number of paramagnetic oxides among the following given oxides is_________.

Li₂O, CaO, Na₂O₂, KO₂, MgO and K₂O

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Contributor-Level 10

Given are the oxide of alkali and alkaline earth metals which are ionic in nature.

Simple oxide are Li₂O, CaO, MgO and K₂O.

Peroxide is Na₂O₂ and superoxide is KO₂.

All simple oxides are diamagnetic as it has no unpaired electron.

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4 months ago

Chemistry Class 11th

Choose the correct order of density of the alkali meals:

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Contributor-Level 10

Density of metal a very specific and depends upon many factors.

Li -> 0.53 gm/cm³

Na -> 0.97 gm/cm³

K -> 0.86 gm/cm³

Rb ->1.53 gm/cm³

Cs -> 1.90 gm/cm³

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4 months ago

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

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Contributor-Level 10

Kindly consider the below image

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

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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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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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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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The correct order of nucleophilicity is

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

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

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Contributor-Level 10

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

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The major product in the following reaction

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Contributor-Level 10

Kindly consider the below image

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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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Contributor-Level 10

Uses of catalyst is very specific for a particular reaction.

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Chemistry Class 11th

The measured BOD values for four different water sample (A-D) are as follows

A = 3 ppm; B = 18 ppm: C = 21 ppm; D = 4 ppm.

The water samples which can be called as highly polluted with organic wastes, are

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