HSC Science कक्षा ११ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

In which of the following options the order of arrangement does not agree with the variation of the property indicated against it?

The electronic configuration of atom is one of the important factor which affects the value of ionisation potential and electron gain enthalpy. Explain

Elements a, b, c and d have the following electronic configurations:

• a: 1s², 2s², 2p⁶
• b: 1s², 2s², 2p⁶, 3s², 3p¹
• c: 1s², 2s², 2p⁶, 3s², 3p⁶
• d: 1s², 2s², 2p¹

Which elements among these will belong to the same group of the periodic table

Give the general electronic configuration of lanthanides and actinides?

Water gas is

Assertion: Permanent hardness of water is removed by treatment with washing soda.

Reason: Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates.

The cause of permanent hardness of water is due to

The hardness of water can be determined by volumetrically using the reagent

Zeolite used to soften hardness of water is, hydrated ___________.

In solid ice, the oxygen atom is surrounded

Water is a _________.

What is a water-gas shift reaction?

A group-1 metal (A) which is present in common salt reacts with (B) to give compound (C) in which hydrogen is present in –1 oxidation state. (B) on reaction with a gas (C) to give universal solvent (D). The compound (D) on reacts with (A) to give (E), a strong base. Identify A, B, C, D and E. Explain the reactions.

The product obtained as a result of a reaction of nitrogen with CaC₂ is ______.

Which of the following has the highest hydration energy

Assertion: Generally alkali and alkaline earth metals form superoxides.

Reason: There is a single bond between O and O in superoxides.

Assertion: BeSO₄ is soluble in water while BaSO₄ is not

Reason: Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.

In context with beryllium, which one of the following statements is incorrect?

Consider the following reversible reaction at equilibrium,

\[\ce{A + B <=> C}\],

If the concentration of the reactants A and B are doubled, then the equilibrium constant will

If there is no change in concentration, why is the equilibrium state considered dynamic?