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Science Preparation for Engineering Entrance

(2706 Posts)

This thread is dedicated to preparation for Science section of Engineering Entrance exams like IITJEE, RPET, BITSAT, GCET, EAMCET, ISAT, KEAM, WBJEE etc. You may share questions related to all topics from Physics and Chemistry.

Question should not exceed 100 characters.Use add options for multiple choice questions and "Uploadimage/Add related data" for passage text papers.
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Kausalya
Shared from IUPAC Nomenclature on Jul 19, 2021 5:42 PM

IUPAC name of the organic compound that is written by the following structure is_____.

 
Hexane-1,3,5-trinitrile
Heptane-1,3,5-trinitrile
3-cyanohexane-1,6-dinitrile
Butane-1,3,4-trinitrile
Butane-1,2,4-trinitrile
Please type your answer before submitting.

Then when will be cyano considered ?

Raghavendra Joshi
Shared from BITSAT Mock - 9 on Jul 04, 2021 8:29 PM

Which of the following statements account(s) for the acidic nature of acetylene?

 
Acetylene contains more number of hydrogen atoms carbon atoms.
Acetylene has a greater percentage of carbon content.
Sigma electron density of C-H bond of acetylene is closer to carbon, which has 50% of s-character.
All of these
Please type your answer before submitting.

A and C both are correct, right?

Raghavendra Joshi
Shared from BITSAT Mock - 7 on Jun 29, 2021 11:10 AM

Directions: Consider the following reaction.

'A' and 'B' are

 
Please type your answer before submitting.

How can double bond be more stable than ring? mustn't option b be correct?

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
Please type your answer before submitting.

Stupid answers

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
Please type your answer before submitting.

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