Chemistry

Given below are the critical temperature of some of the gases:

Gas	Critical temperature (K)
He	5.2
CH₄	190.0
CO₂	304.2
NH₃	405.5

The gas showing least adsorption on a definite amount of charcoal is

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Contributor-Level 10

Higher adsorbtion of gas is corresponds to higher liquefaction and higher liquefaction is directly proportional to the higher critical temperature.

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5 months ago

An antiseptic dettol is a mixture of two compounds 'A' and 'B' where A has 6π electrons and B has 2π electrons. What is 'B'?

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Dettol is a mixture of

(B) is Terpineol.

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Chemistry Class 11th

200mL of 0.01 M HCl is mixed with 400mL of 0.01 M H₂SO₄. The pH of the mixture is___________.

Given: log2 = 0.30, log 3 = 0.48, log5 = 0.70, log7 = 0.84, log11 = 1.04

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Contributor-Level 10

Total concentration of H+ after the mixing of HCl and H2SO4;

$[H^{+}] = \frac{(200 * 0.01) + (400 * 2 * 0.01)}{600}$

$[H^{+}] = \frac{1}{60}$

$∴ p H = l o g_{10} (\frac{1}{60}) = 1.78$

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Which of the following ketone will NOT give enamine on treatment with secondary amine?

[Where t-Bu is -C(CH₃)₃]

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Enolisable carbonyl compound gives enamine with 2° amine.

Does not form enol thus not form enamine.

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Chemistry Class 11th

C(s) + O₂(g) → CO₂(g) + 400 kJ

C(s) + $\frac{1}{2} O_{2} (g) \to C O (g) + 100 k J$

When coal of purity 60% is allowed to burn in presence of insufficient oxygen, 60% of carbon is converted into 'CO' and the remaining is converted into 'CO₂'.

The heat generated when 0.6 kg of coal is burnt is

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Mass of pure carbon in coal = 0.6 * 1000gm * $\frac{60}{100} = 360 g m$

Mass of carbon converted into CO = 6 $\frac{60}{100} * 360 = 216 g m \Rightarrow M o l = \frac{216}{12} = 18$ mole of carbon

Mass of carbon converted into CO₂ = 360 – 216 = 144gm Mole = $\frac{144}{12} = 12$ mole of carbon.

C (s) + O₂ (g) CO₂ (g) + 400KJ

Mole – 12 for CO₂ production, Hence total energy produced = 400 * 12 = 4800KJ

$C_{(s)} + \frac{1}{2} O_{2} (g) \to_{}^{} C O_{(g)} + 100 K J$

Mole = 18 for CO production, Hence energy produced = 100 * 18 = 1800KJ

Total heat = 4800 + 1800 = 6600KJ

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The major product formed in the following reaction, is

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Contributor-Level 10

Kindly consider the following figure

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Chemistry Structure of Atom

Given below are the quantum numbers for 4 electrons.

A. $n = 3, l = 2, m_{l} = 1, m_{s} = + 1 / 2$

B. $n = 4, l = 1, m_{l} = 0, m_{s} = + 1 / 2$

C. $n = 4, l = 2, m_{l} = - 2, m_{s} = - 1 / 2$

D. $n = 3, l = 1, m_{l} = - 1, m_{s} = + 1 / 2$

The correct order of increasing energy is

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Contributor-Level 10

Sequence of sub-energy level decided by the rule of $(n + l) .$

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Which of the following condition or reaction sequence will NOT given acetophenone as the major product?

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Contributor-Level 10

Kindly consider the following figure

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In the given reaction

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Contributor-Level 10

Kindly consider the following figure

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Chemistry Class 11th

Consider the reaction

4HNO₃(l) + 3 KCl(s) → Cl₂(g) + NOCl(g) + 2H₂O(g) + 3KNO₃(s)

The amount of HNO₃ required to produce 110.0g of KNO₃ is

(Given: Atomic masses of H, O, N and K are 1, 16, 14 and 39, respectively)

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