The element with atomic number 55 belongs to which block of the periodic table?

• s-block

• p-block

• d-block

• f-block

Which of the following has largest size?

• Al

• Al⁺

• Al²⁺

• Al³⁺

To which block is related an element having electronic configuration 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s¹ in the periodic table?

• s-block

• p-block

• d-block

• f-block

24.

The electronic configuration of an element is 1s², 2s², 2p⁶, 3s² 3p⁶, 3d¹⁰, 4s² 4p³. Its properties would be similar to which of the following elements?

• Boron

• Oxygen

• Nitrogen

• Chlorine

The number of sp³-hybridised carbon atoms in cyclohexene are

• 2

• 3

• 4

• 6

The formula of phosphate of a metal, M is MPO₄. The formula of its nitrate will be

• M NO₃

• M (NO₃)₂

• M (NO₃)₃

• M₂(NO₃)₃

The formula of phosphate of a metal, M is M NH₄PO₄. The formula of its sulphate will be

• M SO₄

• M (SO₄)₂

• M₂SO₄

• M₂ (SO₄)₃

A 100 mL solution of 0.1 N HCl was titrated with 0.2 N NaOH solution.The titration was discontinued after adding 30 mL of NaOH solution. The remaining titration was completed by adding 025 N KOH solution. The volume of KOH required for completing the titration is 

• 16 mL

• 32 mL

• 35 mL

• 70 mL

On which of the following principles hydrogen bomb is based?

• Nuclear fission

• Nuclear fusion

• Artificial radioactivity

• Natural radioactivity

In the combustion of 2.0 g of methane, 25 kcal heat is liberated, heat of combustion of methane would be

• 100 kcal

• 200 kcal

• 300 kcal

• 400 kcal