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Recent questions in Chemistry
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CBSE XI
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Chemistry
Chemistry
Some basic concepts of chemistry
Structure of Atom
Classification of Elements and periodicity in properties
Chemical Bonding and Molecular Structure
States of Matter: Gases and Liquids
Chemical Thermodynamics
Equilibrium
Redox Reaction
Hydrogen
s-Block Elements
Some p-block Elements
Organic Chemistry: Some Basic Principles and Techniques
Hydrocarbons
Environmental Chemistry
$4g$ of impure $CaCO_3$ on treatment with excess HCl produces $0.88\; g\; CO_2$. What is the percent purity of $CaCO_3$ sample?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 19, 2019
by
meena.clay6
1
answer
Vapour density of a gas is 22. What is its molecular mass?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 18, 2019
by
meena.clay6
1
answer
Which pair of species have same percentage of carbon?$(A) CH_3COOH \;and\; C_6H_{12}O_6\\ (B) CH_3COOH\; and\; C_2H_5OH \\ (C) HCOOCH_3 \;and\; C_{12}H_{22}O_{11} \\ (D) C_6H_{12}O_6 \;and C_{12}H_{22}O_{11}$
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 18, 2019
by
meena.clay6
1
answer
How many moles of electrons weigh one kilogram?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 18, 2019
by
meena.clay6
1
answer
The density of $2M$ solution of sodium chloride (NaCl) $1.13\; g\; mol/litre$. Calculate molality of the solution. $M= 2$ mol per litre.
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 18, 2019
by
meena.clay6
1
answer
Calculate the molecular mass of Ethane $(C_2H_6)$
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 18, 2019
by
meena.clay6
1
answer
Distinguish between pure substance and mixture
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 18, 2019
by
meena.clay6
1
answer
What is limiting reagent?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 18, 2019
by
meena.clay6
1
answer
What is a stoichiometry?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 18, 2019
by
meena.clay6
1
answer
How are physicial properties different from chemical properties ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 15, 2019
by
meena.clay6
1
answer
What is the difference between molecules and compounds ? give examples of each
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 15, 2019
by
meena.clay6
1
answer
Write any four postulates of Daltons atomic theory
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 14, 2019
by
meena.clay6
1
answer
Calculate the percentage composition of element in methanol $(CH_2OH)$
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 14, 2019
by
meena.clay6
1
answer
Calculate the formula mass of KCl (Potassium chloride)
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 14, 2019
by
meena.clay6
1
answer
State Law of Multiple proportions
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 14, 2019
by
meena.clay6
1
answer
Write the formula used to calculate the % composition of elements
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 14, 2019
by
meena.clay6
1
answer
What is meant by dimensional analysis?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 14, 2019
by
meena.clay6
1
answer
$6.02 \times 10^{20}$ molecules of urea are present in 100 mL of its Solution. The concentration of solution is
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 14, 2019
by
meena.clay6
1
answer
When 22.4 L of $H_2(g)$ is mixed with $11.2\;L$ of $Cl_2(g)$ each of at STP the moles of HCl(g) formed is equal to
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 12, 2019
by
meena.clay6
1
answer
If the concentration of glucose $(C_6H_{12}O_6)$ in blood is $0.9\;g\;L^{-1}$. What will be the molarity of glugose in blood ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 12, 2019
by
meena.clay6
1
answer
What will be the molarity of a solution , which contains 5.85 g of Nacl per 500 mL?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 12, 2019
by
meena.clay6
1
answer
The molarity of con.HCl is $1.15\;M$. What volume of con. HCl is required to make 1.00 of 0.1M HCl
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 12, 2019
by
meena.clay6
2
answers
The molarity of con. HCl is 1.15 M; What volume of con. HCl is required to make 1.00 of $0.1\;M\;HCl$
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 11, 2019
by
meena.clay6
1
answer
How much AgCl will be formed by adding 200 ml of 5 M HCl to the solution containing 1.7 gms of $Ag NO_3$?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 11, 2019
by
meena.clay6
1
answer
What is weight of NaOH present in 250 cc of a 2M Solution ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 11, 2019
by
meena.clay6
1
answer
Calculate the number of moles of $H_2SO_4$ present in $50\; ml$ of $0.2 \;m\;H_2SO_4$
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 11, 2019
by
meena.clay6
1
answer
How are physical properties different from chemical properties ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 7, 2019
by
meena.clay6
1
answer
How can we separate the componenets of a compound ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 7, 2019
by
meena.clay6
1
answer
What is the difference between molecules and compounds ?
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
asked
Feb 6, 2019
by
meena.clay6
1
answer
n-Butane and iso-butane are .......... isomers
cbse
class11
chemistry
neet
isomers
asked
May 9, 2017
by
meena.p
1
answer
Which of the following statements is false ?
cbse
class11
chemistry
neet
isomers
asked
May 9, 2017
by
meena.p
1
answer
Which of the following isomerisms is shown by alkenes but not by alkanes ?
cbse
class11
chemistry
neet
isomers
asked
May 9, 2017
by
meena.p
1
answer
A racemic mixture contains equal ........ of dextrorotatory and laevorotatory isomers.
cbse
class11
chemistry
neet
isomers
asked
May 9, 2017
by
meena.p
2
answers
A compound whose molecules are superimposable on their mirror images even though they contain asymmetric carbon atoms is called
cbse
class11
chemistry
neet
isomers
asked
May 9, 2017
by
meena.p
1
answer
Which of the following can exist as diastereomers ?
cbse
class11
chemistry
neet
isomers
asked
May 9, 2017
by
meena.p
1
answer
Which of the following compounds can exhibit geometrical isomerism ?
cbse
class11
chemistry
neet
isomers
asked
May 9, 2017
by
meena.p
1
answer
The simplest alkane capable of exhibiting chain isomerism has ..... carbon atoms.
cbse
class11
chemistry
neet
isomers
asked
May 9, 2017
by
meena.p
1
answer
The functional isomers of ethers are
cbse
class11
chemistry
neet
isomers
asked
May 9, 2017
by
meena.p
1
answer
Total number of conformations of ethane are
cbse
class11
chemistry
neet
isomers
asked
May 9, 2017
by
meena.p
1
answer
Vapours of n-hexane when passed over special catalysts under high pressure and temperature given benzene. This process is called
cbse
class11
chemistry
neet
hydrocarbon
asked
May 9, 2017
by
meena.p
1
answer
Propane when treated with conc. Nitric acid at 723 K gives
cbse
class11
chemistry
neet
hydrocarbon
asked
May 9, 2017
by
meena.p
1
answer
With the increase in branching, the boiling point
cbse
class11
chemistry
neet
hydrocarbon
asked
May 9, 2017
by
meena.p
1
answer
The addition reaction of carbon-carbon double bonds are
cbse
class11
chemistry
neet
hydrocarbon
asked
May 9, 2017
by
meena.p
1
answer
The reactivity of a hydrogen in an alkane depends on
cbse
class11
chemistry
neet
hydrocarbon
asked
May 9, 2017
by
meena.p
1
answer
Alkane molecules are not attacked by electrophiles or neutrophiles because they are
cbse
class11
chemistry
neet
hydrocarbon
asked
May 9, 2017
by
meena.p
1
answer
Wide range of different hydrocarbons are separated into fractions
cbse
class11
chemistry
neet
hydrocarbon
asked
May 9, 2017
by
meena.p
1
answer
Aromatic compounds are known as
cbse
class11
chemistry
neet
hydrocarbon
asked
May 9, 2017
by
meena.p
1
answer
Due to presence of double bonds, alkenes are
cbse
class11
chemistry
neet
hydrocarbon
asked
May 9, 2017
by
meena.p
1
answer
Carbon monoxide is a gas which is
cbse
class11
chemistry
neet
hydrocarbon
asked
May 9, 2017
by
meena.p
1
answer
which of the following compounds can be used as antifreeze in automobile radiators ?
cbse
class11
chemistry
neet
ethers
asked
May 5, 2017
by
meena.p
1
answer
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