Which of the following will favour the reverse reaction in a chemical equilibrium reaction?

The atomic number of an element is equal to the number of ________ present in its atom?

Dielectric strength of a material is________?

Protective gas used in the annealing furnace for steel coil comprises of________?

If the rate of a chemical reaction becomes slower at a given temperature, then the________?

Increasing sulphur content in pig iron tends to make it ________?