Ncert Solutions Chemistry Class 11th
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Sodium forms a crystalline ionic solid with Dihydrogen. The solid is non-volatile and non-conducting in nature. It reacts violently with water to produce Dihydrogen gas. Write the formula of this compound and its reaction with water. What will happen on electrolysis of the melt of this solid?
Sodium forms a crystalline ionic solid with Dihydrogen. The solid is non-volatile and non-conducting in nature. It reacts violently with water to produce Dihydrogen gas. Write the formula of this compound and its reaction with water. What will happen on electrolysis of the melt of this solid?
This is a long answer type question as classified in NCERT Exemplar
Sodium reacts with Dihydrogen to form sodium hydride which is a crystalline ionic solid.
2Na + H2 → 2Na + H-
It reacts with H2O to produce H2 gas
2NaH+2H2O → 2NaOH+2H2
Although Na+H- does not conduct electricity in the solid state, the e
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BF3 does not have proton but still acts as an acid and reacts with NH3. Why is it so? What type of bond is formed between the two?
BF3 does not have proton but still acts as an acid and reacts with NH3. Why is it so? What type of bond is formed between the two?
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: BF3 does not have a proton but still it acts as a Lewis acid as it is an electron pair acceptor and reacts with NH3by accepting its lone pair of electrons. The reaction can be represented by Coordinate bond is formed between B
Upvote The aqueous solution of sugar does not conduct electricity. However, when sodium chloride is added to water, it conducts electricity. How will you explain this statement on the basis of ionisation and how is it affected by concentration of sodium chloride?
The aqueous solution of sugar does not conduct electricity. However, when sodium chloride is added to water, it conducts electricity. How will you explain this statement on the basis of ionisation and how is it affected by concentration of sodium chloride?
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: Conductance of a solution depends upon the number of ions present in the solution since sodium chloride is an ionic compound when mixed in water it ionizes completely forming an aqueous electrolytic solution. Hence, the soluti
Upvote The ionisation of hydrochloric in water is given below:
HCl(aq) + H2O (l ) ⇌ H3O+ (aq) + Cl– (aq)
Label two conjugate acid-base pairs in this ionization.
The ionisation of hydrochloric in water is given below:
HCl(aq) + H2O (l ) ⇌ H3O+ (aq) + Cl– (aq)
Label two conjugate acid-base pairs in this ionization.
This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: Conjugate acid and conjugate base can be shown as-
HCl(aq) + H2O (l) ? H3O+(aq) + Cl-(aq)
acid base conjugate conjugate
Upvote An ionic hydride of an alkali metal has significant covalent character and is almost unreactive towards oxygen and chlorine. This is used in the synthesis of other useful hydrides. Write the formula of this hydride. Write its reaction with Al2Cl6.
An ionic hydride of an alkali metal has significant covalent character and is almost unreactive towards oxygen and chlorine. This is used in the synthesis of other useful hydrides. Write the formula of this hydride. Write its reaction with Al2Cl6.
This is a long answer type question as classified in NCERT Exemplar
It is lithium hydride (LiH) because it has significant covalent character due to the smallest alkali metal, LiH is very stable. It is almost nonreactive towards oxygen and chlorine. It reacts with Al2Cl2 to form lithium aluminium hyd
Upvote Write a relation between ∆G and Q and define the meaning of each term and answer the following :
(a) Why a reaction proceeds forward when Q < K and no net reaction occurs when Q = K.
(b) Explain the effect of increase in pressure in terms of reaction quotient Q. for the reaction :
CO (g) + 3H2 (g) ⇌ CH4 (g) + H2O (g)
Write a relation between ∆G and Q and define the meaning of each term and answer the following :
(a) Why a reaction proceeds forward when Q < K and no net reaction occurs when Q = K.
(b) Explain the effect of increase in pressure in terms of reaction quotient Q. for the reaction :
CO (g) + 3H2 (g) ⇌ CH4 (g) + H2O (g)
This is a Long Answer Type Questions as classified in NCERT Exemplar
Ans: (a) As we know,
ΔG= ?G? +RTlnQ
?G? = Change in free energy as the reaction proceeds,
ΔG = Standard free energy change,
Q = Reaction quotient,
R = Gas constant,
T = Absolute temperature.
Since,
Upvote A colourless liquid ‘A’ contains H and O elements only. It decomposes slowly on exposure to light. It is stabilised by mixing urea to store in the presence of light.
(i) Suggest possible structure of A.
A colourless liquid ‘A’ contains H and O elements only. It decomposes slowly on exposure to light. It is stabilised by mixing urea to store in the presence of light.
(i) Suggest possible structure of A.
This is a long answer type question as classified in NCERT Exemplar
Since, a colourless liquid 'A' contains only hydrogen and oxygen and decomposes slowly on exposure to light but is stabilised by addition of urea, therefore, liquid A may be hydrogen peroxide. A is H2O2.
Structure of H2O2 is giv
Upvote A sparingly soluble salt having general formula Ap+x Bq- y and molar solubility S is in equilibrium with its saturated solution. Derive a relationship between the solubility and solubility product for such salt.
A sparingly soluble salt having general formula Ap+x Bq- y and molar solubility S is in equilibrium with its saturated solution. Derive a relationship between the solubility and solubility product for such salt.
This is a Long Answer Type Questions as classified in NCERT Exemplar
Ans: The equation can be written as-
Ap+x + Bq- y ? xAp+ (aq) + yBq-
S moles of A and B dissolves to give x S moles of Ap+ and y S moles of Bq-.
Ksp = [Ap+]x [Bq-]y = [x5]x [y5]y
= xx y y 5 x+y
Upvote What mass of hydrogen peroxide will be present in 2 litres of a 5 molar solution? Calculate the mass of oxygen which will be liberated by the decomposition of 200 mL of this solution.
What mass of hydrogen peroxide will be present in 2 litres of a 5 molar solution? Calculate the mass of oxygen which will be liberated by the decomposition of 200 mL of this solution.
This is a long answer type question as classified in NCERT Exemplar
Mass of H2O2 = 68 g.
Mol. Mass of H2O2=34gmol-1
∴1L of M solution of H2O2 will contain H2O2=34×5 g
∴2L of 5 M solution will contain H2O2=34×5×2=340g
or 200 mL of 5 solution will contain H2O2 = 200 = 34 g
Now 2H2O2 → 2H2O+O2
&nbs
Upvote (i) Give a method for the manufacture of hydrogen peroxide and explain the reactions involved therein.
(ii) Illustrate oxidising, reducing and acidic properties of hydrogen peroxide with equations.
(i) Give a method for the manufacture of hydrogen peroxide and explain the reactions involved therein.
(ii) Illustrate oxidising, reducing and acidic properties of hydrogen peroxide with equations.
(i) Industrial preparation: H2O2 is prepared by the auto-oxidation of 2- alkylanthraquinols
2-ethylanthraquinol ↔ H2O2+ oxidised product
2Fe2+ (aq)+2H+ (aq)+H2O2 → Fe3 (aq)+2H2O (l)
PbS (s)+4H2O2 (l) → PbSO4 (s)+4H2O (l)
(ii) Reducing action of hydrogen peroxide
2MnO4-+6H++5H2O2→ 2Mn2++8H2O
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