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6 months ago

Chemistry Class 12th

Match the following drugs with their therapeutic action:
(I) Cimetidine structure
(II) Iproniazid structure
(III) Penicillin structure (general)
(IV) Terfenadine structure

(a) Antidepressant
(b) Antibiotic
(c) Antihistamine
(d) Antacid
(e) Analgesic

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Raj Pandey

Contributor-Level 9

(1) Cimetidine $E = P h - C H - {C H}_{3}$ $_{}$ Antacid

(2) Iproniazid ${C H}_{3}$ $_{}$ Antidepressant

(3) Penicillin $\to$ Antibiotic

(4) Terfenadine $\to$ Antihistamines

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6 months ago

Chemistry Class 12th

Three isomers A, B and C (mol. formula C?H?O?) gives the following results:
B or C →Decarboxylation→ D(C?H?)
A →Decarboxylation→ E(an isomer of D)
Both D and E are non-resolvable.
D or E →H?/KMnO?→ Benzoic acid
B is more reactive than C towards decarboxylation reaction.
A, B, C respectively are:

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Raj Pandey

Contributor-Level 9

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6 months ago

Chemistry Chemistry Coordination Compounds

The d-electron configuration of [Fe(H?O)?(NO)]²? and K?[Cr(CN)?] respectively are:

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Raj Pandey

Contributor-Level 9

In ${[F e ? {(H_{2} O)}_{5} (N O)]}^{2 +}$

${F e}^{+ 1} (3 d^{7})$

In ${[{C r}^{+ 3} (C N)_{6}]}^{3 -}$

${C r}^{+ 3} (3 d^{3})$

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6 months ago

Chemistry Class 12th

Complex A has a composition of H?O?Cl?Cr. It has green colour. A 0.2M solution of complex when treated with excess of AgNO? gave 57.45gm of white precipitate. The formula of the complex would be: [Given: at mass Cr = 52amu, Cl = 35.5amu, Ag = 107.8amu ]

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Raj Pandey

Contributor-Level 9

0.2 mole gives $\to 0.4$ mole of $A g C l$ (moles of $A g C l = \frac{57.45}{143} = 0.4$ $\frac{}{}$ )

1 mole complex gives $\to \frac{0.4}{0.2} = 2$ $\frac{}{}$ moles $A g C l$

The correct answer should be $2^{nd}$ $^{}$ option.

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6 months ago

Chemistry Chemistry Classification of Elements and Periodicity in Properties

The five successive ionization enthalpies of an element are 710, 1414, 2550, 28124 and 33845 kJ mol?¹. How many moles of H?SO? will be needed to react completely with 4 moles of the metal hydroxide?

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Raj Pandey

Contributor-Level 9

As the difference in $3^{rd}$ $^{}$ and $4^{th}$ $^{}$ ionisation energy is high so atom contains 3 valence electrons. Hence, valency of the atom is 3 and the metal is trivalent. 4 mole of trivalent metal hydroxide will react with 6 mole of $H_{2} {S O}_{4}$ $_{}_{}$ , $(2 M (O H)_{3} + 3 H_{2} {S O}_{4} ? M_{2} {({S O}_{4})}_{3} + 6 H_{2} O)$

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6 months ago

Chemistry Chemistry Chemical Kinetics

For the reaction A + 2B → 3C + D, which of the following expression represents the rate of formation of C, in terms of rate of decomposition of A :

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Raj Pandey

Contributor-Level 9

The rate of formation of $C$ is three times the rate of decomposition of $A$ .

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6 months ago

Chemistry Class 12th

Arrange the following in increasing order of reactivity towards AgNO? solution:

(I) 1-chloro-2-phenylethane
(II) (Dichloromethyl)cyclopropane
(III) 1-chloro-1-cyclohexylethane
(IV) (1-chloroethyl)benzene

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Raj Pandey

Contributor-Level 9

The reactivity of $S_{N} 1$ $_{}$ reaction depends upon stability of carbocation.

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6 months ago

Chemistry Redox Reactions

Volume strength of original peroxide solution is 16.8 V. Determine the molarity and normality of peroxide solution respectively:

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Raj Pandey

Contributor-Level 9

Normality $= \frac{Volume strength}{5.6} = \frac{16.8}{5.6} = 3$ $\frac{}{} \frac{}{}$

Molarity $= \frac{Normality}{n - factor} = \frac{3}{2} = 1.5$

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6 months ago

Chemistry Chemistry Hydrocarbon

The compound 'A' in the following Reaction is:
A →(1) O?, (2) Zn/H?O→ B + C
B →dil. KOH→ CH?-CH(OH)-CH?-CHO →HCN→ D
C →conc. KOH→ Benzyl alcohol + salt of Benzoic Acid
D →H?O?, Δ→ E

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