1
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The noble gas that does not occur in the atmosphere is :
A
Ne
B
He
C
Kr
D
Ra
2
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The correct statement is :
A
zincite is a carbonate ore.
B
Sodium cyanide cannot be used in the metallurgy of silver.
C
aniline is a froth stabilizer.
D
zone refining process is used for the refining of titanium.
3
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Compound A(C9H10O) shows positive iodoform test. Oxidation of A with KMnO4/KOH given acid B(C8H6O4). Anhydride of B is used for the preparation of phenolphthalein. Compound A is:
A
JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 155 English Option 1
B
JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 155 English Option 2
C
JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 155 English Option 3
D
JEE Main 2019 (Online) 10th April Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 155 English Option 4
4
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The correct option among the following is :
A
Addition of alum to water makes it unfit for drinking.
B
Colloidal medicines are more effective because they have small surface area.
C
Colloidal paraticles in lyophobic sols can be precipitated by electrophoresis.
D
Brownian motion in colloidal solution is faster if the viscosity of the solution is very high.
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