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Questions >> CBSE XI >> Chemistry >> Some basic concepts of chemistry

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

answered Feb 2, 2022 by meena.clay6

1 answer

Which one of the following is not true ?

answered May 15, 2019 by meena.clay6

1 answer

Equal moles of hydrogen and oxygen gases are placed in a container with a pin- hole through which both can escape. what fraction of the oxygen escapes in the time required for one half of the hydrogen to escape ?

answered May 15, 2019 by meena.clay6

1 answer

What is limiting reagent?

answered May 15, 2019 by meena.clay6

1 answer

Calculate the amount of water in gm produced by the combustion of 8 gms of Ethane

answered May 15, 2019 by meena.clay6

1 answer

What is heterogeneous mixture? Give an example.

answered May 15, 2019 by meena.clay6

1 answer

If $500\;mL$ of a 5 M solution is diluted to 1500 mL, what will be the molarity of the solution obtained ?

answered May 14, 2019 by meena.clay6

1 answer

An oxide of metal contains $60\%$ of the metal. What will be the equivalent weight of the metal ?

answered May 14, 2019 by meena.clay6

1 answer

How many moles of electron weight one kiligram ?

answered 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 ?

answered Feb 19, 2019 by meena.clay6

1 answer

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

answered 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.

answered Feb 19, 2019 by meena.clay6

1 answer

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

answered Feb 19, 2019 by meena.clay6

1 answer

write the number of moles in 8g of helium

answered 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?

answered Feb 19, 2019 by meena.clay6

1 answer

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

answered Feb 18, 2019 by meena.clay6

1 answer

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

answered Feb 18, 2019 by meena.clay6

1 answer

How many moles of electrons weigh one kilogram?

answered 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.

answered Feb 18, 2019 by meena.clay6

1 answer

Calculate the molecular mass of Ethane $(C_2H_6)$

answered Feb 18, 2019 by meena.clay6

1 answer

Distinguish between pure substance and mixture

answered Feb 18, 2019 by meena.clay6

1 answer

What is limiting reagent?

answered Feb 18, 2019 by meena.clay6

1 answer

What is a stoichiometry?

answered Feb 18, 2019 by meena.clay6

1 answer

How are physicial properties different from chemical properties ?

answered Feb 15, 2019 by meena.clay6

1 answer

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

answered Feb 15, 2019 by meena.clay6

1 answer

Write any four postulates of Daltons atomic theory

answered Feb 14, 2019 by meena.clay6

1 answer

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

answered Feb 14, 2019 by meena.clay6

1 answer

Calculate the formula mass of KCl (Potassium chloride)

answered Feb 14, 2019 by meena.clay6

1 answer

State Law of Multiple proportions

answered Feb 14, 2019 by meena.clay6

1 answer

Write the formula used to calculate the % composition of elements

answered Feb 14, 2019 by meena.clay6

1 answer

What is meant by dimensional analysis?

answered 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

answered 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

answered 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 ?

answered 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?

answered 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

answered 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 $0.1\;M\;HCl$

answered 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 $Ag NO_3$ ?

answered Feb 11, 2019 by meena.clay6

1 answer

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

answered Feb 11, 2019 by meena.clay6

1 answer

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

answered Feb 11, 2019 by meena.clay6

1 answer

How are physical properties different from chemical properties ?

answered Feb 7, 2019 by meena.clay6

1 answer

How can we separate the componenets of a compound ?

answered Feb 7, 2019 by meena.clay6

1 answer

What is the difference between molecules and compounds ?

answered Feb 7, 2019 by meena.clay6

1 answer

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