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Chemistry NCERT Exemplar Solutions Class 11th Chapter Three

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

The conversion of propan-1- ol to n- butylamine involves the sequential addition of reagents. The correct sequential order of reagent is

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alok kumar singh

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

Hex-4- ene- 2-ol on treatment with PCC gives 'A' on reaction with sodium hypolodite gives 'B', which on further heating with soda lime gives 'C'. The compound 'C' is

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alok kumar singh

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

Given below are two statements.

Statement I : The presence of weaker p-bonds make alkenes less stable than alkanes.

Statement II : The strength of the double bond is greater than that of carbon-carbon single bond.

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

(a) Both Statements I and Statement II are correct.

&nb

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alok kumar singh

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Bond is weaker then - $σ$ bond.

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

Some gases are responsible for heating of atmosphere (green house effect). Identify from following the gaseous species which does not cause it.

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alok kumar singh

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CH₄, O₃ & H₂O are green-house gases.

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

Transition metal complex with highest value of crystal field splitting $(Δ_{0})$ will be

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alok kumar singh

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The value of crystal field spilitting energy $_{}$ $(Δ_{0})$ increases down the group. 5d series member will have more $_{}$ $Δ_{0}$ compared to 3d series or 4d series member.

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

PCl₅ is well known, but NCl₅ is not. Because

(a) Nitrogen is less reactive than phosphorous

(b) Nitrogen doesn't have d-orbitals in its valence shell.

(c) catenation tendency is weaker in nitrogen than phosphorous

(d) size of phosphorous is larger than nitrogen

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alok kumar singh

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Phosphorous can expand its covalency beyond 4, as it has vacant 3d orbitals. Nitrogen can't expand its covelency beyond 4, as it does not posses vacant 3d- orbitals.

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

Which one of the following compounds is used as a chemical in certain type of fire extinguishers?

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alok kumar singh

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Fire extinguisher contains sodium Bicarbonate (NaHCO3), also known as baking soda.

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

In the industrial production of which of the following, molecular hydrogen is obtained as a by product?

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alok kumar singh

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NaOH is obtained by electrolysis of NaCl. Solution of NaCl using Hg cathode

$\begin{array}{l} C a t h o d e : N a^{+} + e \to_{}^{H g} N a - A m a l g a m \\ A n o d e : 2 C l^{-} \to C l_{2} + 2 e \\ 2 N a - A m a l g a m + 2 H_{2} O \to 2 N a O H + 2 H g + H_{2} \end{array}$

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

Which of the following chemical reaction represents Hall-Heroult process

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alok kumar singh

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In Hall Heroult process electrolysis is carried out using carbon anode. The liberated

O2 at anode reacts with anode.

Cathode : $A l^{3 +} (m e l t) + 3 e k \to A l (l)$

Anode : $\begin{array}{l} C (s) + O^{2 -} (M e l t) \to C O (g) + 2 e \\ C (s) + 2 O^{2 -} (M e l t) \to C O_{2} (g) + 4 e \end{array}$

Net Reaction 2Al2O3 + 3C $4 A l + 3 C O_{2}$

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

Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be

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alok kumar singh

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Metal Ag Ga Cs Hg

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