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Q:

The outer electron configuration of Gd (Atomic No : 64) is

1. $4 f^{7} 5 d^{1} 6 s^{2}$

2. $4 f^{3} 5 d^{5} 6 s^{2}$

3. $4 f^{8} 5 d^{0} 6 s^{2}$

4. $4 f^{4} 5 d^{4} 6 s^{2}$

Answer

Answer : 1

Sol :

1. $4 f^{7} 5 d^{1} 6 s^{2}$

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Subject: Chemistry Exam Prep: AIEEE

Q:

Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at –6°C will be: (Kf for water = 1.86 Kg/mol and molar mass of ethylene glycol = 62 kg/mol)

A) 204.60 g	B) 304.30 g
C) 804.32 g	D) 400.00 g

Answer & Explanation Answer: C) 804.32 g

Explanation:

$∆ T_{f} = k_{f} . m$

for ethylene glycol in aq. solution

$∆ T_{f} = k_{f} \frac{w}{m o l . w t} \times \frac{1000}{w t . o f s o l v e n t} 6 = \frac{1.86 x w x 1000}{62 x 4000}$

=> w = 800 g

So, the weight of solute should be more than 800 g.

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Filed Under: Chemistry
Exam Prep: AIEEE

Q:

The magnetic moment (spin only) of $[N i C l_{4}]^{2 -}$ is

A) 1.41 BM	B) 1.82 BM
C) 5.46 BM	D) 2.82 BM

Answer & Explanation Answer: D) 2.82 BM

Explanation:

Hybridisation of Ni is $e^{-}$

Unpaired $3 d^{8}$ in is 2

So $Ω = \sqrt{n (n + 2)} B M = \sqrt{2 x 4} = \sqrt{8} = 2.82 B M$

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Filed Under: Chemistry
Exam Prep: AIEEE

Q:

In a certain city, 5% of all the persons in town have unlisted phone numbers. If you select 100 names at random from that city's phone directory, how many people selected will have unlisted phone numbers?

Answer

Zero. You are selecting names from the list, so they are all listed.

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Subject: Math Puzzles

Q:

What are the various types of CPU registers in a regular operating system design ?

Answer

Stack Pointer
Index Registers
Accumulators
General Purpose Registers

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Subject: Operating Systems

Q:

What is the perfect page size when designing an operating system ?

Answer

The perfect paging size varies from system to system, so there is no single best when it reaches to page size. There are several factors to consider in order to come up with a fitting page size, such as paging time, page table, and its effect on the total performance of the operating system.

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Subject: Operating Systems

Q:

When designing the file structure for an operating system, what attributes are considered ?

Answer

Commonly, the different attributes for a file structure are naming,size, identifier, a level of protection, supported file types and location for the files.

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Subject: Operating Systems

Q:

In Which state is the highest dam found in India ?

Answer

Tehri Dam on Bhagirathi River in Uttarakhand (Height of 260 meters)

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Subject: Longest, Shortest, Deepest

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