Leads is used for making bullets and lead shots because of its
resistance to corrosion
low melting point
high density
flexibility
Correct answer is C
Lead is used for making bullets and lead shots because of its high density.
Ca2+
Na+
Zn2+
K+
Correct answer is A
The test indicates the presence of \(Ca_{2+}\).
NaNO3
Zn(NO3)2
Cu(NO3)2
NH4NO3
Correct answer is D
\(NH_4NO_3 → N_2O + 2H_2O\)
oxygen
chlorine
nitrogen
hydrogen
Correct answer is A
The substance used in the steel industry for the removal of carbon, sulphur, and phosphorus impurities from pig iron is oxygen. This process is called "oxidation" and it occurs when oxygen reacts with the impurities in the pig iron, which then form oxides that can be easily removed.
The rate of a reaction usually decreases with a decrease in the concentration of reactants because
kinetic energy decrease
temperature increase
speed increases
reactants collision decrease
Correct answer is D
Decrease in the concentration of reactants reduces the number of molecules that acquire effective collisions, and consequently reduces the reaction rate.