JEE-Main - Grade 12 - Chemistry - Surface Chemistry - Introduction and Snapshot of Surface Chemistry - Study ref# 863

Introduction:
Surface chemistry deals with phenomena
that occur at the surfaces or interfaces. The interface or surface is
represented by separating the bulk phases by a hyphen or a slash. For
example, the interface between a solid and... read more

JEE-Main - Grade 12 - Mathematics - Linear Programming - Introduction and Snapshot of Linear Programming - Study ref# 932

Introduction
In this chapter, we shall apply the
systems of linear inequalities/ equations to solve some real life problems of
the type as given below:
A furniture dealer deals in only two item
– tables and chairs. He has Rs. 50,000... read more

JEE-Main - Grade 12 - Mathematics - Differential Equations - Introduction and Snapshot of Differential Equations - Study ref# 923

Introduction
In this chapter, we discussed how to find
a function at
each in
its domain of definition. Further, in the chapter on Integral Calculus, we
discussed how to find a function whose
derivative is the function,
... read more

JEE-Main - Grade 12 - Mathematics - Differential Equations - Introduction and Snapshot of Differential Equations - Study ref# 924

Following sections must be covered to
understand the Differential Equations:
1. Basic Concepts
2. General and Particular Solutions of a
Differential Equation
3. Formation of a Differential Equation
whose General Solution is given... read more

JEE-Main - Grade 12 - Chemistry - Solutions - Introduction and Snapshot of Solutions - Study ref# 854

Introduction:
In normal life we rarely come across pure
substances. Most of these are mixtures containing two or more pure
substances. Their utility or importance in life depends on their composition.
For example, the properties of bra... read more

JEE-Main - Grade 12 - Chemistry - Solutions - Introduction and Snapshot of Solutions - Study ref# 855

Following sections must be covered to
understand the Solutions:
1. Types of Solutions
2. Expressing Concentration of Solutions
3. Solubility
4. Vapour Pressure of Liquid Solutions
5. Ideal and Non-ideal Solutions
6. Colligati... read more

JEE-Main - Grade 12 - Chemistry - Electrochemistry - Introduction and Snapshot of Electrochemistry - Study ref# 858

Following sections must be covered to
understand the Electrochemistry:
1. Electrochemical Cells
2. Galvanic Cells
3. Nernst Equation
4. Conductance of Electrolytic Solutions
5. Electrolytic Cells and Electrolysis
6. Batteries
... read more

JEE-Main - Grade 11 - Mathematics - Linear Inequalities - Importance and Snapshot of Linear Inequalities - Study ref# 618

Following sections must be covered to understand the
Linear Inequalities:
1. Inequalities
2. Algebraic Solutions of Linear Inequalities in One Variable and their Graphical Representation
3. Graphical Solution of Linear Inequalities in ... read more

JEE-Main - Grade 11 - Chemistry - Equilibrium - Importance and Snapshot of Equilibrium - Study ref# 669

Following sections must be covered to understand the
Equilibrium:
1. Equilibrium in Physical Processes
2. Equilibrium in Chemical Processes- Dynamic Equilibrium
3. Law of Chemical Equilibrium and Equilibrium Constant
4. Homogeneous ... read more

JEE-Main - Grade 12 - Chemistry - Solutions - Target Setup for Solutions - Study ref# 856

Student requires to achieve the following milestones to get better grip over Solutions. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapter Test000%Subje... read more

Why can dilute solutions of hydrogen peroxide not be
concentrated by heating? How can a concentrated solution of hydrogen peroxide
be obtained? Answer: Dilute solutions of H2O2 cannot be
concentrated by heating because it decomposes much bel... read more

JEE-Main - Grade 11 - Chemistry - The s-Block Elements - Study ref# 1635

Discuss the general characteristics and gradation in
properties of alkaline earth metals. Answer: Elements of group-2, Be, Mg, Ca, Sr, Ba and Ra are
collectively known as alkaline earth metals (except beryllium).
General Characteristics
A... read more

JEE-Main - Grade 11 - Chemistry - The s-Block Elements - Study ref# 1639

When an alkali metal dissolves in liquid ammonia, the
solution can acquire different colours. Explain the reasons for this type of
colour change. Answer: The dilute solutions of alkali metals in liquid ammonia
exhibit dark colour because amm... read more

Assuming complete dissociation, calculate the pH of the
following solutions:
(a)0.003 M HCL (b)0.005M NaOH
(c)0.002M HBr (d)0.002M KOH Answer: (a) 0.003M HCl=0.003M[H3O+]
pH=-log[H3O+... read more

Equal volumes of 0.002 M solutions of sodium iodate and
cupric chlorate are mixed together. Will it lead precipitation of copper
iodate?(For cupric iodate Ksp=7.4×10-8) Answer:
(Due to mixing of equal volumes, molar concentratio... read more

Find the real solutions of the equation
Hint- Here, we do not add two different
inverse trigonometric function. So, we use the domain of and and
simplify them. Answer... read more

Which of the following units is useful in
relating concentration of solution with its vapour pressure?
(a) Mole fraction
(b) Parts per million
(c) Mass percentage
(d) Molality Answer: (a) According to Henry’s law partial
pressure o... read more

Which of the following aqueous solutions
should have the highest boiling point?
(a) 1.0 M NaOH
(b) 1.0 M Na2SO4
(c) 1.0 M NH4NO3
(d) 1.0 M KNO3 Answer: As we know greater the value of van’t
Hoff factor higher will be the elevation ... read more

The unit of ebullioscopic constant is
(a) K kg mol-1 or K (molality)-1
(b) mol kg K-1 or K-1
(molality)
(c) kg mol-1K-1 or
K-1 (molality)-1
(d) K mol kg-1 or K
(molality) Answer: (a) As ... read more

Which of the following statements is
false?
(a) Two different solutions of sucrose of
same molality prepared in different solvents will have the same depression in
freezing point.
(b) The osmotic pressure of a solution is
given by t... read more

Consider the figure and mark the correct
option.
(a) Water will move from side (A) to side
(B) if a pressure lower osmotic pressure is applied on piston (B)
(b) Water will move from side (B) to side
(A) if a p... read more

4 L of 0.02 M aqueous solution of NaCl
was diluted by adding 1 L of water. The molality of the resultant solution
is……… .
(a) 0.004
(b) 0.008
(c) 0.012
(d) 0.016
Hint: To calculate the strength of
solution wh... read more

Two beakers of capacity 500 ml were
taken. One of these beakers, labelled as “A”, was filled with 400 ml water
whereas the beaker labelled “B” was filled with 400 ml of 2M solution of
NaCl. At the same temperature both the beakers were place... read more

Isotonic solutions must have the same………
.
(a) solute
(b) density
(c) elevation in boiling point
(d) depression in freezing point Answer: (c, d) Isotonic solutions have same
osmotic pressure and same concentration. E... read more

Explain the solubility “rule like
dissolve like” in terms of intermolecular forces that exist in solutions. Answer: If the intermolecular interactions are
similar in both constituents, i.e., solute and solvent then solute dissolves
in the so... read more

What is the significance of Henry’s law
constant? Answer: According to Henry’s law
Higher the value of Henry’s law constant, the lower is the solubility
of the gas in a liquid. Thus, the solubility of a gas in the given liquid can
be in... read more

What is “semipermeable membrane”? Answer: Continuous sheets or films (natural or
synthetic) which contain a network of submicroscopic holes or pores through
which small solvent molecules (water etc.) can pass, but solute molecules of
bigger ... read more

Define the following modes of expressing
the concentration of a solution? Which of these modes are independent of
temperature and why?
(a) w/w (mass percentage)
(b) V/V (volume percentage)
(c) w/V (mass by volume
percentage)
(d) ... read more

Using Raoult’s law explain how the total
vapour pressure over the solution is related to mole fraction of components
in the following solutions.
(a) CHCl3 (l) and CH2Cl2
(l)
(b) NaCl(s) and H2O (l)
Answer: According to Raoult’s law... read more

Conductivity of
an electrolytic solution depends on
(a)
Nature of electrolyte
(b)
Concentration of
electrolyte
(c)
Power of AC source
(d)
Distance between the
electrodes Answer: (a, b)
conductivity of ... read more

Solutions of two
electrolytes A and B are diluted the of ‘b’ increases 1.5
times while that of a increases 25 times. Which of the two is a electrolyte?
Justify your answer. Answer: Strong
... read more

When acidulated
water (dil. H2SO4 solution) is electrolyzed, with pH of
the solution be affected? Justify your answer. Answer: Since pH of
solution depends upon concentration of H+ presence in solutions. pH of the
solutions will not be ef... read more

The 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……… .

Assertion (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 - Chemistry in Everyday Life - Study ref# 10058

Which 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 more