1
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
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
The correct order of ionic radii for the ions, P3$$-$$, S2$$-$$, Ca2+, K+, Cl$$-$$ is :
A
P3$$-$$ > S2$$-$$ > Cl$$-$$ > K+ > Ca2+
B
Cl$$-$$ > S2$$-$$ > P3$$-$$ > Ca2+ > K+
C
P3$$-$$ > S2$$-$$ > Cl$$-$$ > Ca2+ > K+
D
K+ > Ca2+ > P3$$-$$ > S2$$-$$ > Cl$$-$$
3
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Which one of the following is used to remove most of plutonium from spent nuclear fuel?
A
ClF3
B
O2F2
C
I2O5
D
BrO3
4
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?
A
BCl3
B
BF3
C
BBr3
D
BI3
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