Ncert Solutions Chemistry Class 11th

The exact volumes of 1 M NaOH solution required to neutralize 50 mL of 1M H₃PO₃ solution and 100 mL of 2M H₃PO₂ solution respectively, are

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Contributor-Level 10

This problem involves the stoichiometry of acid-base neutralization.

o For the reaction with H? PO? (a dibasic acid), 100 mL of NaOH is required.

o For the reaction with H? PO? (a monobasic acid), 200 mL of NaOH is required.

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The correct statement about H₂O₂ are:
(A) Used in the treatment of effluents.
(B) Used as both oxidizing and reducing agents
(C) The two hydroxyl groups lie in the same plane.
(D) Miscible with water.
Choose the correct answer from the options given below:

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Contributor-Level 10

Kindly go through the solution

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The gas phase reaction 2A(g) ? A?(g) At 400 K has ΔG° = +25.2 kJ mol?¹.
The equilibrium constant K? for this reaction is ________ *10?². (Round off to the nearest integer).
[ Use: R = 8.3 J mol?¹ K?¹, In10 = 2.3, log? 2 = 0.30, 1atm = 1 bar]
[antilog (-0.3) = 0.501]

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Contributor-Level 9

ΔG° = + 25.2 kJ / mol
Using ΔG° = -2.3 RT log Kp
25.2 * 10³ = - 2.3 * 8.3 * 400 log Kp

o 3.3 = log Kp
log (1 / 2*10³) = log Kp
Kp = 1 / (2*10³)
Using; Kp = Kc (RT)
1 / (2*10³) = Kc (0.083 * 400)? ¹

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FeX₂ and FeY₃ are known when x and y are:

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Iron (III) iodide (FeI? ) does not exist because it is unstable. The Fe³? ion is a strong enough oxidizing agent to be easily reduced to Fe²? by the I? ion, which in turn is oxidized.

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The green house gas/es is (are) :
(A) Carbon dioxide
(B) Oxygen
(C) Water vapour
(D) Methane
Choose the most appropriate answer from the options given below:

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Oxygen gas (O? ) is not considered a greenhouse gas.

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Statement I: Sodium hydride can be used as an oxidizing agent.
Statement II: The lone pair of electrons on nitrogen in pyridine makes it basic.
Choose the CORRECT answer from the options given below:

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In sodium hydride (NaH), hydrogen has an oxidation state of -1. In this state, it can only act as a reducing agent.

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The oxidation states of nitrogen in NO, NO?, N?O and NO? are in the order of:

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Oxidation state of N
| NO | +2 |
|-|-|
| NO? | +4 |
| N? O | +1 |
| NO? | +5 |
So, order of oxidation state is
NO? > NO? > NO > N? O

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The oxide that shows magnetic property is:

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Mn? O? is mixed oxide which contains MnO and Mn? O? , so Mn is in +2 and +3 oxidation state respectively. Both Mn? ² & Mn³? has unpaired electrons so Mn? O? will show magnetic property. While all other oxides have no unpaired electrons either on cation or on anion.

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Match List – I with List – II:
| List – I | List – II |
| :--- | :--- |
| (a) Be | (i) Treatment of cancer |
| (b) Mg | (ii) Extraction of metals |
| (c) Ca | (iii) Incendiary bombs and signals |
| (d) Ra | (iv) Windows of X-ray tubes |
| | (v) Bearings for motor engines. |

Choose the most appropriate answer from the option given below:

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Be is used in X ray tube windows.
Mg is used in incendiary bombs & signals.
Compounds of Ca i.e CaCO? is used in extraction of metals like Fe.
Radium (Ra) is used in treatment of cancer in radiotherapy.

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_____ grams of 3-Hydroxy propanal (MW = 74) must be dehydrated to produce 7.8g of acrolein (MW = 56) (C?H?O) if the percentage yield is 64. (Round off to the nearest integer).
[Given: Atomic masses: C: 12.0u, H:1.0u, O:16.0u]

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