HSC Science Class 11 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

Which one of the following represents 180 g of water?

Two 22.4 litre containers A and B contains 8 g of O₂ and 8 g of SO₂ respectively at 273 K and 1 atm pressure, then

What is the mass of precipitate formed when 50 ml of 8.5% solution of AgNO₃ is mixed with 100 ml of 1.865% potassium chloride solution?

Which of the following is/are true with respect to carbon-12.

Which one of the following is used as a standard for atomic mass.

Define relative atomic mass.

Calculate the average atomic mass of naturally occurring magnesium using the following data.

The reaction between aluminium and ferric oxide can generate temperatures up to 3273 K and is used in welding metals.
(Atomic mass of Al = 27 u Atomic mass of O = 16 u)
\[\ce{2Al + Fe2O3 -> Al2O3 + 2Fe}\]; If, in this process, 324 g of aluminium is allowed to react with 1.12 kg of ferric oxide.

1. Calculate the mass of Al₂O₃ formed.
2. How much of the excess reagent is left at the end of the reaction?

Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?

The quantum mechanical treatment of the hydrogen atom gives the energy value:

E_n = `(-13.6)/"n"^2` ev atom⁻¹

1. use this expression to find ΔE between n = 3 and n = 4
2. Calculate the wavelength corresponding to the above transition.

The Li²⁺ ion is a hydrogen like ion that can be described by the Bohr model. Calculate the Bohr radius of the third orbit and calculate the energy of an electron in 4^th orbit.

Define modern periodic law.

Justify that the fifth period of the periodic table should have 18 elements on the basis of quantum numbers.

Tritium nucleus contains

If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be

The reaction \[\ce{H3PO2 + D2O -> H2DPO2 + HDO}\] indicates that hypo-phosphorus acid is

Write a chemical equation for the following reaction.

Reaction of hydrogen with tungsten (VI) oxide on heating.

Write a chemical equation for the following reaction.

Hydrogen gas and chlorine gas.

Complete the following chemical reaction and classify the reaction.

\[\ce{KMnO4 + H2O2 ->}\]

Complete the following chemical reaction and classify the reaction.

\[\ce{CrCl3 + H2O ->}\]