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Chemistry The p-Block Elements

Calgon is used for water treatment. Which of the following statement is NOT true about Calgon?

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Payal Gupta

Contributor-Level 10

It does not contains 2^nd most abundant element by weight in earth crust because that is Si Calgon

$\to_{}^{W a t e r s o l u b l e} 2 N a^{+} {[N a_{4} {(P O_{3})}_{6}]}^{2 -}$

$\to_{}^{C a^{2 +}} 2 N a^{+} {[N a_{2} C a {(P O_{3})}_{6}]}^{2 -}$

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New answer posted

a year ago

Chemistry Amines

Ceric ammonium nitrate and CHCl₃/alc. KOH are used for the identification of functional groups present in…………. and……………respectively.

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Payal Gupta

Contributor-Level 10

Ceric ammonium nitrate is used to test alcohol while CHCl₃/alc. KOH is used to test 1° amine

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a year ago

Chemistry Surface Chemistry

Which of the following is a correct statements?

(a) Brownian motion destabilizes sols

(b) Any amount of dispersed phase can be added to emulsion without establishing it.

(c) Mixing two oppositely charged sols in equal amount neutralizes charges and stabilizes colloids.

(d) Presence of equal and similar charges on colloidal particles provides stability to the colloidal solution.

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alok kumar singh

Contributor-Level 10

Due to equal and similar charge particle will repel each other, hence will never precipitate.

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New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

The solubility of AgCl will be maximum in which of the following?

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alok kumar singh

Contributor-Level 10

Due to common ion effect solubility of AgCl will decreases in KCl, AgCl and AgNO₃ but in deionized water, no common ion effect will takes place so maximum solubility.

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a year ago

Chemistry Chemistry Chemical Bonding and Molecular Structure

Arrange the following in the decreasing order of their covalent character:

(A) LiCl
(B) NaCl

(C) KCl

(D) CsCl

Choose the most appropriate answer from the options given below:

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alok kumar singh

Contributor-Level 10

Covalent character is $L i C l > N a C l > K C l > C s C l .$ As the cationic size increases polarization decreases.

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New answer posted

a year ago

Chemistry Structure of Atom

Which of the following statements are correct?

(A) The electronic configuration of Cr is [Ar] 3d⁵4s¹.

(B) The magnetic quantum number may a negative value.

(D) The total number of nodes are given by (n-2)

Choose the most appropriate answer

...more

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alok kumar singh

Contributor-Level 10

(A) Cr = [Ar]3d⁵4s¹

(B) m = $- l t o + l$

(D) Total nodes = n – 1

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New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Five

$C_{6} H_{12} O_{6} \overset{Z y m a s e}{\to}$ A $\to_{Δ}^{N a O l} B + C H l_{3}$

The number of carbon atoms present in the product B is______________.

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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New answer posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Five

Observe structure of the following compounds

The total number of structures / compounds which possess asymmetric atoms is________.

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Vishal Baghel

Contributor-Level 10

No. of compounds containing asymmetric carbon are

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a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Five

Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55g of the compound neutralized 12.5 mL of 1M H₂SO₄ solution. The percentage of nitrogen in the compound is_________ (Nearest Integer)

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Vishal Baghel

Contributor-Level 10

Millie q. of H₂SO₄ used by NH₃ = 12.5 * 1 * 2 = 25

So millimoles of N = 25

Moles of N = 25 * 10^-3

Wt of N = 14 * 25 * 10^-3

% of N = $\frac{14 * 25 * 1 0^{- 3}}{0.55} * 100 = 63.66 ≅ 64$

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a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Five

An acidified magnate solution undergoes disproportionation reaction. The spin- only magnetic moment value of the product having manganese in higher oxidation state is________ B.M. (Nearest Integer)

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Vishal Baghel

Contributor-Level 10

$3 M n O_{4}^{2 -} + 4 H^{+} \to_{}^{} 2 M n O_{4}^{-} + M n O_{2} + 2 H_{2} O$

No. of unpaired electron in Mn⁷⁺ = 0

$μ = 0 B . M$

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