1
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?
A
Base Acid End point
Weak Strong Colourless to pink
B
Base Acid End point
Strong Strong Pinkish red to yellow
C
Base Acid End point
Weak Strong Yellow to pinkish red
D
Base Acid End point
Strong Strong Pink to colourless
2
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
Phenol reacts with methyl chloroformate in the presence of NaOH to form product A. A reacts with Br2 to form product B. A and B are respectively :
A
JEE Main 2018 (Offline) Chemistry - Alcohols, Phenols and Ethers Question 168 English Option 1
B
JEE Main 2018 (Offline) Chemistry - Alcohols, Phenols and Ethers Question 168 English Option 2
C
JEE Main 2018 (Offline) Chemistry - Alcohols, Phenols and Ethers Question 168 English Option 3
D
JEE Main 2018 (Offline) Chemistry - Alcohols, Phenols and Ethers Question 168 English Option 4
3
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
The oxidation states of Cr in [Cr(H2O)6]Cl3, [Cr(C6H6)2] and K2[Cr(CN)2(O)2(O2)(NH3)] respectively are :
A
+3, 0 and +4
B
+3, +4 and +6
C
+3, +2 and +4
D
+3, 0 and +6
4
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

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