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Shreya Singhal

Shared from BITSAT Mock - 6 on Sep 20, 2020 12:03 AM

In the conversion of limestone to lime,

CaCO₃(s) CaO (s) + CO₂(g),

the values of H⁰ and S⁰ are +179.1kJ mol^-1 and 160.2 J/K, respectively, at 298 K and 1 bar. Assuming that H⁰ and S⁰ do not change with temperature, the temperature above which conversion of limestone to lime will be spontaneous is

1008 K

1200 K

845 K

1118 K

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Shreya Singhal

Stupid answers

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Gaurav Singh

Shared from Paper-1 (2007) IIT-JEE on Sep 19, 2020 6:55 PM

Directions: The following question is based on the paragraph given below.

Chemical reactions involve interaction of atoms and molecules. A large number of atoms / molecules (approximately 6.023 ×10²³) are present in a few grams of any chemical compound varying with their atomic /molecular masses. To handle such large numbers conveniently, the mole concept was introduced.
This concept has implications in diverse areas such as analytical chemistry, biochemistry, electrochemistry and radiochemistry. The following example illustrates a typical case, involving chemical/electrochemical reaction, which requires a clear understanding of the mole concept. A 4.0 molar aqueous solution NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrodes (atomic mass : Na = 23, Hg = 200;1 Faraday = 96500 coulombs).

The total number of moles of chlorine gas evolved is

0.5

1.0

2.0

3.0

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Gaurav Singh

Question is having wrong value of NaCl concentration. In question it is given [NaCl]=4.0M while in solution it is given, [NaCl]=0.4M

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Chetan Vishnu

Shared from BITSAT Mock - 6 on Sep 16, 2020 8:00 PM

Which of the following compounds is named correctly?

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Chetan Vishnu

IF FUNCTIONAL GRP IS IN RING ,IT WILL HAVE MORE PRIORITY SO KETONE WILL HAVE MORE PRIORITY THAN CARBOXYLIC ACID

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Kishlay

Shared from BITSAT Mock - 6 on Sep 15, 2020 9:51 AM

On adding 0.1 M solution of [Ag⁺], [Ba²⁺] and [Ca²⁺] (each) in a Na₂SO₄ solution, compound that will be precipitated first is
[K_sp BaSO₄ = 10^-11, K_sp CaSO₄ = 10^-6 and K_sp Ag₂SO₄ = 10^-5]

Ag₂SO₄

BaSO₄

CaSO₄

None of the above

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Kishlay

You must specify how the answer must be given

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Jerry Purohit

Shared from IISER Mock - 1 on Sep 14, 2020 10:06 PM

The equivalent mass of a metal is 4. The vapour density of its chloride is 59.25. Its atomic mass is:

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Nidhi Chanda

Did not understand

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