Q:

How many molecules are present in one mole of water?

A) 6.02 x 1023 molecules	B) 6.02 x 1026 molecules
C) 8.02 x 1022 molecules	D) 7.02 x 1023 molecules

Answer & Explanation Answer: A) 6.02 x 1023 molecules

Explanation:

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Filed Under: Chemistry
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0 16201

Q:

Temporary hardness is due to the presence of

A) Calcium carbonate	B) calcium bicarbonate
C) magnesium sulphate	D) calcium sulphate

Answer & Explanation Answer: B) calcium bicarbonate

Explanation:

Temporary hardness is due to the presence of soluble bicarbonates of calcium and magnesium in water. Permanent hardness is due to the presence of sulphates and chlorides of calcium and magnesium.

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41 16201

Q:

Rearrange the parts of the sentence in correct order

Truth was

P-to lead to a breach of peace as a false one
Q-no defence since
R-a true defamatory statement was as likely

A) QPR	B) RQP
C) PQR	D) PRQ

Answer & Explanation Answer: A) QPR

Explanation:

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0 16199

Q:

The electrochemical cell stops working after some time because ________

A) Electrode potential of both the electrodes becomes zero	B) One of electrodes completely vanishes
C) Electrode potential of both electrodes equalizes	D) The reaction reverses its direction

Answer & Explanation Answer: C) Electrode potential of both electrodes equalizes

Explanation:

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92 16196

Q:

Smallest gulf in the world is

A) Gulf of Mexico	B) Persian Gulf
C) Gulf of Oman	D) Gulf of California

Answer & Explanation Answer: D) Gulf of California

Explanation:

A gulf in geography is a large bay that is an arm of an ocean or sea.

The second smallest sea on Earth is the Sea of Cortez, more commonly called the Gulf of California. This sea is about 62,000 square miles. It lies between Mexico and the Baja California Peninsula.

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27 16194

Q:

The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 $d m^{3}$ at 27°C is to a volume of 100 $d m^{3}$

A) 42.3 J/ mole / K	B) 38.3 J/ mole / K
C) 35.8 J/ mole / K	D) 32.3 J/ mole / K

Answer & Explanation Answer: B) 38.3 J/ mole / K

Explanation:

$∆ s = n R \ln \frac{v 2}{v 1}$

$= 2.303 n R \log \frac{v 2}{v 1}$ = $2.303 \times 2 \times 8.314 \times \log (\frac{100}{10})$ = $38.3 J$ $m o l^{- 1}$ $k^{- 1}$

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Q:

Select the antonym of

malignant

A) mortal	B) internecine
C) benign	D) lethal

Answer & Explanation Answer: C) benign

Explanation:

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Filed Under: English
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Q:

Rearrange the parts of the sentence in correct order.

P: Children with good manners are liked by one and all.
Q: They are appreciated even by strangers.
R: All round development of a child is possible only if a child is groomed in good manners.
S: Therefore, the public schools lay great emphasis on the cultivation of good manners in their students.

A) PQRS	B) QPSR
C) RSQP	D) SRPQ

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