1
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
An aqueous solution contains an unknown concentration of Ba2+. When 50 mL of a 1 M solution of Na2SO4 is added, BaSO4 just begins to precipitate. The final volume is 500 mL. The solubility product of BaSO4 is 1 $$\times$$ 10–10. What is the original concentration of Ba2+?
A
1.0 $$\times$$ 10–10 M
B
5 $$\times$$ 10–9 M
C
2 $$\times$$ 10–9 M
D
1.1 $$\times$$ 10–9 M
2
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
An aqueous solution contains 0.10 M H2S and 0.20 M HCl. If the equilibrium constants for the formation of HS from H2S is 1.0 $$\times$$ 10–7 and that of S2- from HS ions is 1.2 $$\times$$ 10–13 then the concentration of S2- ions in aqueous solution is :
A
5 $$\times$$ 10–19
B
5 $$\times$$ 10–8
C
3 $$\times$$ 10–20
D
6 $$\times$$ 10–21
3
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following are Lewis acids?
A
BCl3 and AlCl3
B
PH3 and BCl3
C
AlCl3 and SiCl4
D
PH3 and SiCl4
4
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following salts is the most basic in aqueous solution?
A
Pb(CH3COO)2
B
Al(CN)3
C
CH3COOK
D
FeCl3
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