Chemistry

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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Contributor-Level 10

Cast iron is formed by pig iron and scrap iron.

Pig Iron → Carbon 4%

Cast Iron → Carbon 3%

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8 months ago

Chemistry Class 11th

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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8 months ago

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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8 months ago

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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Chemistry Class 11th

$K_{a_{1}}, K_{a_{2}} a n d K_{a_{3}}$ 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

Contributor-Level 10

(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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8 months ago

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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8 months ago

Match the List-I with List-II

Choose the correct answer from the options given below:

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Contributor-Level 10

$[C H_{3} {(C H_{2})}_{15} - N {(C H_{3})}_{3}] B r \to$ used in toothpaste

$C_{17} H_{35} C O O N a + N a_{2} C O_{3} + R o s i n a t e s \to$ used in laundry soap

$C H_{3} {(C H_{2})}_{16} C O O {(C H_{2} C H_{2} O)}_{n} C H_{2} C H_{2} O H \to$ used in dish washing powder

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8 months ago

L- isomer of a compound 'A' (C₄H₈O₄) gives a positive test with ${[A g {(N H_{3})}_{2}]}^{+}$ . Treatment of 'A' with acetic anhydride yields triacetate derivative. Compound 'A' produces an optically active compound (B) and an optically inactive compound (C) on treatment with bromine water and HNO₃ respectively. Compound (A) is:

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Contributor-Level 10

Following are related reactions.

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8 months ago

Match the List-I with List-II

List – I List – II

(Polymer) &nbs

...more

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Contributor-Level 10

Bakelite used for making electrical switches, Glyptal used for paints and lacquers, PVC used for water pipe and polystyrene used for Television cabinets.

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8 months ago

Given below two statements:

Statement- I : In Hofmann degradation reaction, the migration of only an alkyl group takes place from carbonyl carbon of the amide to the nitrogen atom.

Statement- II : The group is migrated in Hofmann degradation reaction to electron deficient atom.

In the light of the above statement, choose the most appropriate answer from the options given below:

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