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

In what period and group will an element with Z = 118 will be present?

Explain the Pauling method for the determination of ionic radius.

Explain the periodic trend of ionisation potential.

Why the first ionisation enthalpy of sodium is lower than that of magnesium while its second ionisation enthalpy is higher than that of magnesium?

By using Pauling's method calculate the ionic radii of K⁺ and Cl⁻ ions in the potassium chloride crystal. Given that `"d"_("K"^+) - "Cl"^-` = 3.14 Å

Explain the following, give an appropriate reason.

Ionisation potential of N is greater than that of O

Explain the following, give an appropriate reason.

First ionisation potential of the C-atom is greater than that of the B atom, whereas the reverse is true is for the second ionisation potential.

Explain the following, give an appropriate reason.

The electron affinity values of Be and Mg are almost zero and those of N (0.02 eV) and P (0.80 eV) are very low.

Explain the following, give an appropriate reason.

The formation of \[\ce{F^-_{(g)}}\] from \[\ce{F_{(g)}}\] is exothermic while that of \[\ce{O^2-_{(g)}}\] from \[\ce{O_{(g)}}\] is endothermic.

What is the screening effect?

Briefly give the basis for Pauling's scale of electronegativity.

State the trends in the variation of electronegativity in groups and periods.

Heavy water is used as

Do you think that heavy water can be used for drinking purposes?

Give the uses of heavy water.

The suspension of slaked lime in water is known as _________.

The name 'Blue John' is given to which of the following compounds?

Formula of Gypsum is

When CaC₂ is heated in atmospheric nitrogen in an electric furnace the compound formed is

A 20 litre container at 400 K contains CO₂ (g) at pressure 0.4 atm and an excess (neglect the volume of solid SrO). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when the pressure of CO₂ attains its maximum value will be:

Given that: \[\ce{SeCO3(S)≅ SrO + CO2 (g)}\] [K_p = 1.6 atm]