Tags Chemistry NCERT Exemplar Solutions Class 11th Chapter Eight

Chemistry NCERT Exemplar Solutions Class 11th Chapter Eight

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2 weeks ago

Chemistry NCERT Exemplar Solutions Class 11th Chapter Eight Class 12th

For carbon dating of a wood sample ${(\frac{C^{14}}{C^{12}})}_{t} = \frac{1}{8} {(\frac{C^{14}}{C^{12}})}_{t = 0}$ . If Half life of C¹⁴ is 1580 years what is the life of wood sample (in yr)

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alok kumar singh

Contributor-Level 10

${(\frac{C^{14}}{C^{12}})}_{t} = \frac{{(\frac{C^{14}}{C^{12}})}_{t = 0}}{{(2)}^{n}}$

n = 3

t = 3 * 1580

= 4740 years

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Chemistry NCERT Exemplar Solutions Class 11th Chapter Eight Class 11th

How many oxides are amphoteric in nature?

SnO₂, PbO₂, SiO₂, P₂O₅, Al₂O₃, CO₂, CO, NO, N₂O

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alok kumar singh

Contributor-Level 10

Amphoteric oxides are those which can react with both acid and base

SnO₂, PbO₂ and Al₂O₃ are amphoteric oxide

SiO₂, P₂O₅, CO₂ are acidic oxides

CO, NO and N₂O are neutral oxides

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Chemistry NCERT Exemplar Solutions Class 11th Chapter Eight Chemistry Electrochemistry

Total number of deactivating groups among the following

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alok kumar singh

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–C º N $? \underset{\begin{array}{l} | ? | \\ O \end{array}}{C}$ , – CH₃ are –R group which is deactivating

– $\ddot{N} H$ – $\overset{\begin{array}{l} O \\ | ? | \end{array}}{C}$ – CH₃ and – $\ddot{N} H$ – CH₃ due to presence of lone pair in nitrogen atom behaves as activating (+R) group.

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Chemistry NCERT Exemplar Solutions Class 11th Chapter Eight Class 12th

We are given with following cell reaction:

2H⁺ + 2e^– $\overset{}{\to}$ H₂

_{$P_{H_{2}}$
=}_{2 atm}

[H⁺] = 1 M

$(\frac{2.303 R T}{F} = 0.06)$

If E_cell for reaction is given by –x * 10^–3 V, find out x.

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alok kumar singh

Contributor-Level 10

E_cell = 0 – log2

= – 0.03 (0.3)

= – 0.009

= – 9 * 10^–3 V

x = 9

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Chemistry NCERT Exemplar Solutions Class 11th Chapter Eight Class 12th

Find out total possible optical isomers of 2-chlorobutane.

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alok kumar singh

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There is one chiral centre present in given compound which is unsymmetrical.

Total number of isomers = 2ⁿ

n = number of stereogenic centre

n = 1

= 2¹

= 2

Total two optical isomers are possible

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Chemistry NCERT Exemplar Solutions Class 11th Chapter Eight Class 11th

A white precipitate was formed when BaCl₂ was added to water extract of an inorganic salt. Further, a gas 'X' with characteristic odour was released when the formed white precipitate was dissolved in dilute HCl. The anion present in the inorganic salt is

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alok kumar singh

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$B a C l_{2} + S O_{3}^{2 -} \overset{}{\to} \underset{W h i t e}{B a S O_{3}} ↓ \overset{d i l . H C l}{\to} \underset{\begin{array}{l} b u r n i n g s u l p h u r \\ l i k e s m e l l \end{array}}{S O_{2} ↑}$