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Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Six

The metal that is not extracted from its sulfide ore is

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alok kumar singh

Contributor-Level 10

Al is extracted from Al₂O₃.2H₂O i.e, Bauxite ore.

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Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Ten

The metal that has very low melting point and its periodic position is closer to a metalloid is

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alok kumar singh

Contributor-Level 10

Element Melting Point

Al 933 K

...more

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Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Five

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

Assertion A: Finest gold is red in colour, as the size of the particles increase, it appears purple then blue and finally gold.

Reason R: The colour of the colloidal solution depends on the wavelength of light scattered by the dispersed particles.

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

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alok kumar singh

Contributor-Level 10

the finest gold sol is red in colour, as the size of particle increases, it appears purple then blue and finally gold. The colour of colloidal solution depends on the wavelength of light scattered by the dispersed particles. The wavelength of light further depends on size and nature of the particles. Hence, both assertion and reason are true and reason is the correct explanation of assertion.

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Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Four

At $30 ° C,$ the half life for the decomposition of AB₂ is 200s and is independent of the initial concentration of AB₂. The time required for 80% of the AB₂to decompose is

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alok kumar singh

Contributor-Level 10

t_1/2 = 200 sec and it is 1st order reaction

$K = \frac{2.303 l o g 2}{200} = \frac{2.303}{t} l o g \frac{C o}{0.2 C o}$

$\frac{l o g 2}{200} = \frac{1}{t} l o g 5$

$t = \frac{7}{3} * 200 = 466.67 s e c = 467 s e c$

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Chemistry Solutions

Match List – I and List – II.

Choose the correct answer from the options given below

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Payal Gupta

Contributor-Level 10

(c) $2 C H_{3} C H_{2} C l \to_{e t h e r}^{2 N a} C_{2} H_{5} - C_{2} H_{5} + 2 N a C l (W u r t z R e a c t i o n)$

(d) $2 C_{6} H_{5} C l \to_{e t h e r}^{2 N a} C_{6} H_{5} - C_{6} H_{5} + 2 N a C l (W i t t i n g R e a c t i o n)$

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Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Four

Arrange the following in increasing order of heir covalent character.

(A). CaF₂

(B). CaCl₂

(C) CaBr₂

(D) CaI₂

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alok kumar singh

Contributor-Level 10

According to Fajan's rule,

Covalent character $\propto$ size of anion

$∴ C a F_{2} < C a C l_{2} < C a B r_{2} < C a l_{2}$

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Chemistry Surface Chemistry

The nature of charge on resulting colloidal particles when FeCl₃ is added to excess of hot water is

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Payal Gupta

Contributor-Level 10

$F e C l_{3} \to_{}^{h y d r o l y s i s} F e {(O H)}_{3} ↓ \to_{A d s o r p t i o n}^{F e^{3 +}} F e {(O H)}_{3} | F e^{3 +} (c o l l o i d a l p a r t i c l e)$

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Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Twelve

Among the following the number of curves not in accordance with Freundlich adsorption isotherm is_________.

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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Chemistry Chemistry Some Basic Concepts of Chemistry

Hemoglobin contains 0.34% of iron by mass. The number of Fe atoms in 3.3g of hemoglobin is (Given: Atomic mass of Fe is 56 u, N_A = 6.022 * 10²³ mol^-1.)

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