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Questions >> CBSE XI

CBSE XI

How many moles of electron weight one kiligram ?

asked Feb 19, 2019 by meena.clay6

1 answer

What is molarity of a solution contain $5.84\;gms$ of $NaCl$ in 200 ml of solution ?

asked Feb 19, 2019 by meena.clay6

1 answer

What is the percentage of carbon , hydrogen and oxygen in ethanol ?

asked Feb 19, 2019 by meena.clay6

1 answer

What do you mean by gram atomic mass. one million silver atoms weigh $1.79 \times 10^{16}\;g$ . Calculate the gram atomic mass of silver.

asked Feb 19, 2019 by meena.clay6

1 answer

How can we say that sugar is solid and water is liquid ?

asked Feb 19, 2019 by meena.clay6

1 answer

write the number of moles in 8g of helium

asked Feb 19, 2019 by meena.clay6

1 answer

$4g$ of impure $CaCO_3$ on treatment with excess HCl produces $0.88\; g\; CO_2$ . What is the percent purity of $CaCO_3$ sample?

asked Feb 19, 2019 by meena.clay6

1 answer

Vapour density of a gas is 22. What is its molecular mass?

asked Feb 18, 2019 by meena.clay6

1 answer

Which pair of species have same percentage of carbon? $(A) CH_3COOH \;and\; C_6H_{12}O_6\\ (B) CH_3COOH\; and\; C_2H_5OH \\ (C) HCOOCH_3 \;and\; C_{12}H_{22}O_{11} \\ (D) C_6H_{12}O_6 \;and C_{12}H_{22}O_{11}$

asked Feb 18, 2019 by meena.clay6

1 answer

How many moles of electrons weigh one kilogram?

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.

asked Feb 18, 2019 by meena.clay6

1 answer

Calculate the molecular mass of Ethane $(C_2H_6)$

asked Feb 18, 2019 by meena.clay6

1 answer

Distinguish between pure substance and mixture

asked Feb 18, 2019 by meena.clay6

1 answer

What is limiting reagent?

asked Feb 18, 2019 by meena.clay6

1 answer

What is a stoichiometry?

asked Feb 18, 2019 by meena.clay6

1 answer

How are physicial properties different from chemical properties ?

asked Feb 15, 2019 by meena.clay6

1 answer

What is the difference between molecules and compounds ? give examples of each

asked Feb 15, 2019 by meena.clay6

1 answer

Write any four postulates of Daltons atomic theory

asked Feb 14, 2019 by meena.clay6

1 answer

Calculate the percentage composition of element in methanol $(CH_2OH)$

asked Feb 14, 2019 by meena.clay6

1 answer

Calculate the formula mass of KCl (Potassium chloride)

asked Feb 14, 2019 by meena.clay6

1 answer

State Law of Multiple proportions

asked Feb 14, 2019 by meena.clay6

1 answer

Write the formula used to calculate the % composition of elements

asked Feb 14, 2019 by meena.clay6

1 answer

What is meant by dimensional analysis?

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

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

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 ?

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?

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

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 $0.1\;M\;HCl$

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 $Ag NO_3$ ?

asked Feb 11, 2019 by meena.clay6

1 answer

What is weight of NaOH present in 250 cc of a 2M Solution ?

asked Feb 11, 2019 by meena.clay6

1 answer

Calculate the number of moles of $H_2SO_4$ present in $50\; ml$ of $0.2 \;m\;H_2SO_4$

asked Feb 11, 2019 by meena.clay6

1 answer

How are physical properties different from chemical properties ?

asked Feb 7, 2019 by meena.clay6

1 answer

How can we separate the componenets of a compound ?

asked Feb 7, 2019 by meena.clay6

1 answer

What is the difference between molecules and compounds ?

asked Feb 6, 2019 by meena.clay6

1 answer

If $\bigg(p+\large\frac{a}{v^2}\bigg)$ $(v-b)=RT$ </br> $where\; P=pressure,V=volume,R=gas \;constant, T=temperature$ <br>Then find dimension of a and b?

asked Jul 11, 2018 by meena.p

1 answer

$2\sin ^2\large\frac{3\pi}{4}$ $+2\cos^2\large\frac{\pi}{4}$ $+2\sec^2\large\frac{\pi}{3}$ =

asked Jul 3, 2018 by pady_1

1 answer

Find all pairs of consecutive even possitive integers both of which are lar

asked May 23, 2017 by sharma.pankaj2500

1 answer

Write about india's space program

asked May 19, 2017 by pady_1

1 answer

n-Butane and iso-butane are .......... isomers

asked May 9, 2017 by meena.p

1 answer

Which of the following statements is false ?

asked May 9, 2017 by meena.p

1 answer

Which of the following isomerisms is shown by alkenes but not by alkanes ?

asked May 9, 2017 by meena.p

1 answer

A racemic mixture contains equal ........ of dextrorotatory and laevorotatory 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

asked May 9, 2017 by meena.p

1 answer

Which of the following can exist as diastereomers ?

asked May 9, 2017 by meena.p

1 answer

Which of the following compounds can exhibit geometrical isomerism ?

asked May 9, 2017 by meena.p

1 answer

The simplest alkane capable of exhibiting chain isomerism has ..... carbon atoms.

asked May 9, 2017 by meena.p

1 answer

The functional isomers of ethers are

asked May 9, 2017 by meena.p

1 answer

Total number of conformations of ethane are

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

asked May 9, 2017 by meena.p

1 answer

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