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1
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
The charges on the colloidal CdS sol and TiO2 sol are, respectively :
A
positive and positive
B
positive and negative
C
negative and negative
D
negative and positive
2
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
$${C_{12}}{H_{22}}{O_{11}} + {H_2}O\buildrel {Enzyme\,A} \over \longrightarrow \mathop {{C_6}{H_{12}}{O_6}}\limits_{Glu\cos e} + \mathop {{C_6}{H_{12}}{O_6}}\limits_{Fructose} $$

$$\mathop {{C_6}{H_{12}}{O_6}}\limits_{Glu\cos e} \buildrel {Enzyme\,B} \over \longrightarrow 2{C_2}{H_5}OH + 2C{O_2}$$

In the above reactions, the enzyme A and enzyme B respectively are :
A
Zymase and Invertase
B
Invertase and Amylase
C
Amylase and Invertase
D
Invertase and Zymase
3
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
For the coagulation of a negative sol, the species below, that has the highest flocculating power is :
A
Na+
B
Ba2+
C
PO$$_4^{3 - }$$
D
SO$$_4^{2 - }$$
4
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
A colloidal system consisting of a gas dispersed in a solid is called a/an :
A
foam
B
aerosol
C
solid sol
D
gel
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