JEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9772
Extent of
adsorption of adsorbate from solution phase increases with……… .
(a)
Increase in amount of adsorbate in ... read more
JEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9776
On the basis of data given below predict
which of the following gases shows least adsorption on a definite amount of
charcoal?
read moreJEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9777Which of the following will show Tyndall
effect?
(a)
Aqueou... read more JEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9778Freshly prepared precipitate sometimes
gets converted to colloidal solution by …….. .
(a) &nbs... read more JEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9779The values of colligative properties of
colloidal solution are of small order in comparision to those shown by true
soolutions of same concentration because of colloidal particles……… .
read more JEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9780Which of the following curves is in according
with Freund-lich adsorption isotherm?
(a) ... read more JEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9781Freund-lich
adsorption isotherm is given by the expression which
of the following conclusions can be drawn from this expression?
read more JEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9782Which of the following substances will
precipitate the negatively charged emulsions?
(a) &nbs... read more JEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9783Which of the following colloids cannot be
coagulated easily?
(a) &nbs... read more JEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9784What happens when gelatin is mixed with
gold sol? Answer: Gold sol is a
solvent repelling sol i.e., a lyophobic sol and unstable in nature. Addition
of gelatin stabilizes the gold sol because gelatin forms lyophilic sol and
act as a prote... read moreJEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9785Gelatin which
is a peptide is added in ice-creams. What can be its role? Answer: Emulsifying
agent is emulsion to stabilize the emulsion. Emulsifying agent from a layer
between suspended particles and the medium and hence stabilizes the emu... read moreJEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9786What is
collodion? Answer: 4% solution of
nitrocellulose in a mixture of alcohol and either is called collodion.... read moreJEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9787What causes Brownian motion in colloidal
dispersion? Answer: Brownian movement may be defined as
continuous zig -zag movement of colloidal particles in a colloidal sol. A
state of continuous zig- zag motion of colloidal particles appears to ... read moreJEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9788Why does
leather get hardened after tanning? Answer: Animal hide in
nature and has positively charged particles. When it is soaked in tannin
(negatively charged), a colloid, it results in mutual coagulation and gets
harden. Thus, leather ... read moreJEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9789How will you
distinguish between dispersed phase and dispersion medium in an emulsion? Answer: To distinguish
between dispersed phase and dispersion medium we increase the concentration
of any one dispersion medium or dispersed phase then no... read moreJEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9790Why does
bleeding stop by rubbing moist alum? Answer: Blood is a
colloidal sol. When we rub the injured part with moist alum then coagulation
of blood takes place. Hence, main reason is coagulation, which stops the
bleeding.... read moreJEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9791Match the statement given in Column I
with the phenomenon given in Column II.
... read moreJEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9792Match the item given in column I and
column II
| read moreJEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9793Assertion (A)
Colloidal solution show colligative properties.
Reason (R)
Colloidal particles are large in size.
(a) &nb... read more JEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9794Assertion (A)
Colloidal solutions do not show Brownian motion.
Reason (R) Brownian
motion is responsible for stability of sols.
read more JEE-Main - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9795Assertion (A) Detergents
with low CMC are more economical to use.
Reason (R) cleansing
action of detergents involves the formation of micelles. These are formed
when the concentration of detergents become equal to CMC.
read more JEE-Main - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9840In the
following question, a statement of assertion is followed by a statement of
reason.
Assertion (A)
HNO3 makes iron passive.
Reason (R) HNO3
forms a protective layer of ferric nitrate on the surface of iron.
... read moreJEE-Main - Grade 12 - Chemistry - Haloalkanes and Haloarenes - Study ref# 9909Arrange the following compounds in
increasing order of their boiling points.
(a) &n... read more JEE-Main - Grade 12 - Chemistry - Haloalkanes and Haloarenes - Study ref# 9922Which is the correct increasing order of
boiling points of the following compounds?
1_iodobutane, 1-bromobutane,
1-chlorobutane, Butane
a)
Butane< 1-chlorobutane<1-bromobutane
<1_iodo... read moreJEE-Main - Grade 12 - Chemistry - Chemistry in Everyday Life - Study ref# 10058Which of the following statements is not
correct?
(a) Some antiseptics can be added to
soaps
(b) Dilute solutions of some
disinfectants can be used as antiseptic
(c) Disinfectants are antimicrobial
drugs.
(d) Antiseptic medici... read moreJEE-Main - Grade 12 - Chemistry - Chemistry in Everyday Life - Study ref# 10079Where are receptors located? Answer: Receptors are proteins that are crucial
to body’s communication process. Receptors are embedded on the outer surface
of the cell membrane in such a way that their small part possessing active
site project... read moreJEE-Main - Grade 12 - Chemistry - Chemistry in Everyday Life - Study ref# 10085What is a soft soap? Answer: Chemical substances which concentrates at
the surface of the solution or interfaces, from surface films, reduces
surface tension of the solution and help in removing dirt and dust by
emulsifying grease are called... read more
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