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Class 12th Determinants

If Δ =
| 1 3cosθ 1 |
| sinθ 1 sinθ |
| 1 3cosθ 1 |
, then the maximum value of Δ is:

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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a year ago

Class 12th Chemistry

The major product of the following reaction is:
(3-methylpentan-2-ol reacts with conc. H?SO? and Heat)

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Raj Pandey

Contributor-Level 9

Kindly consider the following Image

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New answer posted

a year ago

Class 12th Chemistry

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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a year ago

Class 12th Chemistry

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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New answer posted

a year ago

Class 12th 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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a year ago

Class 12th Chemistry

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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a year ago

Class 12th 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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