In which of the following classifications are the elements arranged in the order of their increasing atomic number?

Halogens are belonging to:

Which of the following will be a negative ion?

Electronic configuration of the outer shell of the element Gd with atomic number 64 is

What will be the work done by 3 moles of an ideal gas when it expands spontaneously in vacuum?

Find the temperature at which the below reaction will be in equilibrium if the enthalpy and entropy change for the reaction is 30 Kj mol-1 and 105 J K-1 mol-1 respectively
Br2(l) + Cl2(g) → 2BrCl(g)

Which of the following is an organic compound with the formula C₆H₄Cl₂ that is used as a fumigant insecticide to control cloth months?

__________________ is a drug or substance that makes you feel relaxed and makes your body work and react more slowly.