Q:

The degree of dissociation ( $α$ ) of a weak electrolyte, $A_{x} B_{y}$ is related to van't Hoff factor (i) by the expression:

$1 . α = \frac{x + y + 1}{i - 1}$

$2 . α = \frac{x + y - 1}{i - 1}$

$3 . α = \frac{i - 1}{x + y + 1}$

$4 . α = \frac{i - 1}{x + y - 1}$

A) 1 is correct	B) 2 is correct
C) 3 is correct	D) 4 is correct

Answer & Explanation Answer: D) 4 is correct

Explanation:

Van't Hoff factor (i) = $\frac{O b s e r v e d C o l l i g a t i v e P r o p e r t y}{N o r m a l C o l l i g a t i v e P r o p e r t y}$

$\begin{matrix} A_{x} B_{y} \\ 1 - α \end{matrix} \to \begin{matrix} x A^{+ y} \\ x α \end{matrix} + \begin{matrix} y B^{- x} \\ y α \end{matrix}$

Total Moles = $1 - α + x α + y α$ = $1 - α (x + y - 1)$

$i = \frac{1 + α (x + y - 1)}{1}$

$\Rightarrow α = \frac{i - 1}{x + y - 1}$

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Filed Under: Chemistry
Exam Prep: AIEEE

6 7437

Q:

Which number will complete the series?

14, 27, 52, 101, 198, ?

A) 381	B) 395
C) 391	D) 394

Answer & Explanation Answer: C) 391

Explanation:

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Filed Under: Verbal Reasoning - Mental Ability

0 7435

Q:

The lead character in the film ' The Bandit Queen ' has been played by

A) Shabana Azmi	B) Rupa Gangulu
C) Seema Biswas	D) Arundhati ray

Answer & Explanation Answer: C) Seema Biswas

Explanation:

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Filed Under: Books and Authors

10 7416

Q:

Merdeka cup is associated with

A) Badminton	B) Tennis
C) Football	D) Hockey

Answer & Explanation Answer: C) Football

Explanation:

Merdeka cup is associated with Football in Indonesia.

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Filed Under: General Awareness
Exam Prep: AIEEE , Bank Exams , CAT
Job Role: Analyst , Bank Clerk , Bank PO

5 7411

Q:

Cutting and peeling of onion brings tears to the eyes because of the presence of _____ ?

A) Amino acid	B) Sulfur
C) Carbon	D) Fat

Answer & Explanation Answer: B) Sulfur

Explanation:

Cutting and Peeling of onion brings Tears to the eyes because of presence of Sulphur in the cell.

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Filed Under: Chemistry
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26 7407

Q:

In which of the following mammals estrous cycle is absent ?

A) Rabbit	B) Horse
C) Cow	D) Monkey

Answer & Explanation Answer: D) Monkey

Explanation:

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Filed Under: Biology
Exam Prep: AIEEE , Bank Exams

19 7403

Q:

Which of the following crop is known as Green Gold?

A) Coffee	B) Neem
C) Tea	D) Rice

Answer & Explanation Answer: C) Tea

Explanation:

Tea crop is known as Green Gold.

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Filed Under: General Science
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11 7397

Q:

Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K?

A) K1k2/k1+k2	B) 2k1k2/k1+k2
C) K1+k2/k1k2	D) None

Answer & Explanation Answer: B) 2k1k2/k1+k2

Explanation:

We know that,

The equivalent K = $\frac{L 1 + L 2}{\frac{L 1}{K 1} + \frac{L 2}{K 2}}$

where L1 & L2 are plate1 & Plate2 thicknesses, K1 & K2 are coefficient thermal conductivity of plate1 & Plate2 respectively.

But here L1 = L2 = L (say)

Then K = L+L/(L/K1 + L/K2) = $\frac{2 K 1 K 2}{K 1 + K 2}$

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Filed Under: Physics
Exam Prep: GATE , Bank Exams , AIEEE
Job Role: Network Engineer

12 7389

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