1
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
If dichloromethane (DCM) and water (H2O) are used for differential extraction, which one of the following statements is correct ?
A
DCM and H2O would stay as upper and lower layer respectively in the separating funnel (S.F.)
B
DCM and H2O will make turbid/colloidal mixture
C
DCM and H2O would stay as lower and upper layer respectively in the separating funnel(S.F).
D
DCM and H2O will be miscible clearly
2
JEE Main 2019 (Online) 9th January Morning Slot
+4
-1
The correct match between Item-I and Item-II is :

Item-I (drug) Item-II (test)
A Chloroxylenol P Carbylamine test
B Norethindrone Q Sodium hydrogen carbonet test
C Sulphapyridine R Ferric chloride test
D Penicillin S Bayer's test
A
A $$\to$$ R;  B $$\to$$ P;  C $$\to$$ S;  D $$\to$$ Q
B
A $$\to$$ Q;  B $$\to$$ S;  C $$\to$$ P;  D $$\to$$ R
C
A $$\to$$ R;  B $$\to$$ S;  C $$\to$$ P;  D $$\to$$ Q
D
A $$\to$$ Q;  B $$\to$$ P;  C $$\to$$ S;  D $$\to$$ R
3
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
For standardizing NaOH solution, which of the following is used as a primary standard ?
A
Ferrous Ammonium Sulfate
B
dil. HCl
C
Oxalic acid
D
Sodium tetraborate
4
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
In a complexometric titration of metal ion with ligand
M(Metal ion) + L(Ligand) $$\to$$ C(Complex) end point is estimated spectrophoto - metrically (through light absorption). If 'M' and 'C' do not absorb light and only 'L' absorbs, then the titration plot between absorbed light (A) versus volume of ligand 'L' (V) would look like :
A
B
C
D
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