Chemistry

The total number of acidic oxides from the following list is NO, N₂O, B₂O₃, N₂O₅, CO, SO₃, P₄O₁₀

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Acidic oxides : $B_{2} O_{3}, P_{4} O_{10}, S O_{3}, N_{2} O_{5}$

Neutral oxide : $N_{2} O,$ NO, CO

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The correct order of density is

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Element Density (gm/cm³)

Be 1.84

Mg 1.74

Ca &nb

...more

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High purity (> 99.95%) dihydrogen is obtained by

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High purity (> 99.95%) H₂ gas is obtained by electrolysis of warm aqueous Ba (OH)₂ solution using Ni electrode.

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Given below are two statements.

Statement I: Pig iron is obtained by heating cast iron with scrap iron.

Statement II: Pig iron has a relatively lower carbon content than that of cast iron. In the light of the above statements, choose the correct answer form the options given below.

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Cast iron is formed by pig iron and scrap iron.

Pig Iron → Carbon 4%

Cast Iron → Carbon 3%

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The first ionization entahalpies of Be, B, N and O follow the order

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Ionization enthalpy: B < Be < O < N

IE of N > O [Due to half-filled configuration]

IE of Be > B [Due to penetration effect]

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For micelle formation, which of the following statements are correct?

A. Micelle formation is an exothermic process.

B. Micelle formation is an endothermic process.

C. The entropy change is positive.

D. The entropy change is negative.

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During micelle formation, $Δ S$ is positive

Micelle formation is endothermic at low temperature and exothermic at high temperature.

At room temperature ⇒ Micelle formation is endothermic.

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The molar conductivity of a conductivity cell filled with 10 moles of 20 mL NaCl solution is

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$\land_{M} = \frac{K * 1000}{M}$ $M_{2} = \frac{20}{(80 / 1000)}$

$\frac{\land_{M_{1}}}{\land_{M_{2}}} = \frac{M_{2}}{M_{1}}$ $M_{1} = \frac{10}{(20 / 1000)}$

$\frac{\land_{M_{1}}}{\land_{M_{2}}} = \frac{1}{2} \Rightarrow \land_{M_{2}} = 2 \land_{M_{1}}$

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$K_{a_{1}}, K_{a_{2}} a n d K_{a_{3}}$ are the respective ionization constants for the following reaction (a), (b) and (c).

(A) $H_{2} C_{2} O_{4} ? H^{+} + H C_{2} O_{4}^{-}$

(B) $H C_{2} O_{4}^{+} ? H^{-} + C_{2} O_{4}^{2 -}$

(C) $H_{2} C_{2} O_{4} ? 2 H^{+} + C_{2} d_{4}^{2 -}$

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Chemistry Chemistry Solutions

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(I) $H_{2} C_{2} O_{4} ? H^{+} + H C_{2} O_{4}^{-}$

(II) $H C_{2} O_{4}^{-} ? H^{+} + C_{2} O_{4}^{2 -}$

(I) + (II); $H_{2} C_{2} O_{4} ? 2 H^{+} + C_{2} O_{4}^{2 -}$

$K_{a_{3}} = K_{a_{1}} * K_{a_{2}}$

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Two solutions A and B are prepared by dissolving 1g of no-volatile solutes X and Y respectively in 1 kg of water. The ratio of depression in freezing point for A and B is found to be 1 : 4. The ratio of molar masses of X and Y is

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$Δ T_{f} = i * k_{f} * M$

$\frac{{(Δ T_{f})}_{x}}{{(Δ T_{f})}_{y}} = \frac{i K_{f} m_{x}}{i K_{f} M_{Y}} = \frac{M_{X}}{M_{Y}}$

$\Rightarrow \frac{1}{4} = \frac{1}{M_{X}} * \frac{M_{Y}}{1} \Rightarrow \frac{M_{X}}{M_{Y}} = \frac{4}{1} = \frac{1}{0.25}$

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