Chemistry

The major product of the following reaction, if it occur by $S_{N}^{2}$ mechanism is:

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Which one of the following is the major product of the given reaction?

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Given below are two statements:

Statement I: Ethyl pent -4-yn-oate on reaction with CH₃MgBr gives a 3° -alcohol.

Statement II: In this reaction one mole of ethyl pent-4-yn-oate utilizes two moles of CH₃MgBr.

In the light of the above statements, choose the most appropriate answer from the options given below.

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Chemistry Class 11th

The correct order of ionic radii for the ions, $P^{3 -}, S^{2 -}, C a^{2 +}, K^{+}, C l^{-} i s :$

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Ionic radii of cations is smaller than anions, also more the positive charge less be the ionic radii and more the negative charge more be the ionic radii. Hence correct order of ionic radii is, $p^{3 -} > S^{2 -} > C l^{-} > K^{+} > C a^{2 +}$

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Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803K?

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Chemistry Coordination Compounds

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When red phosphorus is heated in a sealed tube at 803 K, a - black phosphorus is formed.

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The number of miles of NH₃, that must be added to 2L of 0.80 M AgNO₃ in order to reduce the concentration of Ag⁺ions to 5.0 * 10^-8 M (K_formation for [Ag(NH₃)₂]⁺ = 1.0 * 10⁸) is_________.

(Nearest integer)

[Assume no volume change on adding NH₃]

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$A g^{+} (a q) + 2 N H_{3} (a q) ? A g {(N H_{3})}_{2}^{+} (a q)$

t = 00.8 M $(\frac{a}{2}) M$

0 $= \infty$ 5 * 10^-8 M $(\frac{a}{2} - 1.6) M$ 0.8M

$k_{f} = \frac{[A g {(N H_{3})}_{2}^{+}]}{[A g^{+}] {[N H_{3}]}^{2}}$

$1 0^{8} = \frac{0.8}{(5 * 1 0^{- 8}) {(\frac{a}{2} - 1.6)}^{2}}$

$\frac{a}{2} = 2$

Concentration of NH₃ added = $\frac{a}{2} = 2 M$

Volume of solution = 2L

Moles of NH₃ added = 2 * 2 mol = 4 mol.

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Chemistry Thermodynamics

200 mL of 0.2 M HCl is mixed with 300 mL of 0.1 M NaOH. The molar heat of neutralization of this reaction is -57.1 kJ. The increase in temperature in °C of the system on mixing is x > 10^-2. The value of x is__________. (Nearest integer)

[Given : Specific heat of water = 4.18 J g^-1 K^-1

Density of water = 1.00 g cm^-3]

(Assume no volume change on mixing)

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Millimoles of HCl = 200 * 0.2 = 40

Millimoles of NaOH = 300 * 0.1 = 30

Heat released = $\frac{30}{1000} * 57.1 * 1000 J = 1713 J$

$[\begin{array}{l} ρ = \frac{m}{v} \\ m = ρ v \end{array}]$

Mass of solution = 500 * 1 g

= 500 g

Specific heat of water = 4.18 Jg^-1 K^-1

$Δ T = \frac{q}{m c}$

$= \frac{1713}{500 * 4.18} ° C$

$= 81.96 * 1 0^{- 2} ° C \approx 82 * 1 0^{- 2} ° C$

Ans. = 82

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Chemistry Redox Reactions

When 10 mL of an aqueous solution of KMnO₄ was titrated in acidic medium, equal volume of 0.1 M of an aqueous solution of ferrous sulphate was required for complete discharge of colour. The strength of KMnO₄ is grams per litre is________* 10^-2. (Nearest integer)

[Atomic mass of K = 39, Mn = 55, O = 16]

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Let molarity of KMnO₄ = x

$K M n O_{4} + F e S O_{4} \to F e_{2} {(S O_{4})}_{3} + M n^{2 +}$

n = 5 n = 1 Ferric sulphate

equivalent of KMnO₄ = equivalent of FeSO₄

5 * x * 10 = 1 * 0.1 * 10

x = 0.02 M

Strength = (0.02 * 158) = 3.16g/L

= 316 * 10^-2 g/L

Ans. = 316

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The number of f electrons in the ground state electronic configuration Np (Z = 93) is_________.

(Nearest integer)

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$\underset{(z = 93)}{N p} \Rightarrow 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{6} 5 s^{2}$

$4 d^{10} 5 p^{6} 6 s^{2} 4 f^{14} 5 d^{10} 6 p^{6} 7 s^{2} 5 f^{4} 6 d^{1}$

Total number of f-electrons = 14 + 4 = 18 electrons

Ans. = 18

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The number of moles of CuO, that will be utilized in Dumas method for estimating nitrogen in a sample of 57.5g of N, N-dimethylaminopentane is________ * 10^-2. (Nearest integer).

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