1
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Choose the correct statement from the following :
A
The standard enthalpy of formation for alkali metal bromides becomes less negative on descending the group.
B
The low solubility of CsI in water is due to its high lattice enthalpy.
C
Among the alkali metal halides, LiF is least soluble in water.
D
LiF has least negative standard enthalpy of formation among alkali metal fluorides.
2
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The addition of dilute NaOH to Cr3+ salt solution will give :
A
a solution of [Cr(OH)4]$$-$$
B
precipitate of Cr2O3(H2O)n
C
precipitate of [Cr(OH)6]3$$-$$
D
precipitate of Cr(OH)3
3
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Given below are two statements :

Statement I : Ethyl pent-4-yn-oate on reaction with CH3MgBr gives a 3$$^\circ$$-alcohol.

Statement II : In this reaction one mole of ethyl pent-4-yn-oate utilizes two moles of CH3MgBr.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Both Statement I and Statement II are false.
B
Statement I is false but Statement II is true.
C
Statement I is true but Statement II is false.
D
Both Statement I and Statement II are true.
4
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
In stratosphere most of the ozone formation is assisted by :
A
cosmic rays
B
$$\gamma$$-rays
C
ultraviolet radiation
D
visible radiations
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