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 8336

Q:

Modern periodic table is based on atomic number of the elements. The significance of atomic number was proved by the experiment of ________

A) Moseley's work on X-ray spectra	B) Bragg's work on X-ray diffraction
C) Mulliken's oil drop experiment	D) Discovery of X-ray by Roentgen

Answer & Explanation Answer: A) Moseley's work on X-ray spectra

Explanation:

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Filed Under: Chemistry

8 8333

Q:

The rank of the different Ministers in the Union Council of Ministers is determined by the

A) President	B) Prime Minister
C) Cabinet Secretary	D) Speaker of the Lok Sabha

Answer & Explanation Answer: B) Prime Minister

Explanation:

The rank of the different ministers is determined by the Prime Minister, according to whose advice the President appoints the Ministers [ Art 75(1) ] and also allocates business among them [ Art 77 ].

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Filed Under: Indian Politics

18 8327

Q:

What is the motto Incorporated under our National Emblem?

A) Satyam Shivam	B) Satyam Shivam Sundaram
C) Satyameva Jayate	D) Jai Hind

Answer & Explanation Answer: C) Satyameva Jayate

Explanation:

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Filed Under: Indian History

15 8326

Q:

Branch of agriculture concerned with the production of crops

A) Agrotology	B) Agronomy
C) Agrostology	D) Anthropology

Answer & Explanation Answer: B) Agronomy

Explanation:

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Filed Under: Biology

36 8321

Q:

Which compound contains both ionic and covalent bonds?

A) NaNO3	B) CaSO4
C) NH4Cl	D) All of the above

Answer & Explanation Answer: D) All of the above

Explanation:

Here all the given compounds have both ionic and covalent bonds.

NaNO3 - In Sodium nitrate, Nitrate is covalently bonded as nitrogen is bonded with 3 oxygen atoms. And this nitrate is ionically bonded with sodium.

CaSO4 - In Calcium sulphate, sulphate is covalently bonded as sulphur is bonded with 4 oxygen atoms. And this sulphate is ionically bonded with calcium.

NH4Cl - In Ammonium chloride, ammonium is covalently bonded as nitrogen is bonded with 4 hydrogen atoms. And this ammonium is ionically bonded with chlorine.

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Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams , CAT , GATE
Job Role: Analyst , Bank Clerk , Bank PO

5 8307

Q:

Which social evil was conspicuously absent in ancient India?

A) Polygamy	B) Sati system
C) Devadasi system	D) Purdah system

Answer & Explanation Answer: D) Purdah system

Explanation:

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Filed Under: Indian History

8 8306

Q:

Who amongst the following is a famous Sarod player

A) Zakir Hussain	B) Hari Prasad Chourasia
C) Ram Narain	D) Amjad Ali Khan

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