Question

fill in the blanks:
(i)Separation of sodium chloride and potassium nitrate is achieved by_______(distillation,fractional distillation,crystallisation,solvent extraction)
(ii)Copper oxide reacts with hydrogen to produce copper qnd water. Copper oxide is _____ (reduced/oxidised) in this reaction.
(iii)Potassium is placed in ___group and ___ period of periodic table.(first,second,third).
(iv)Atomic no. is equal to the no. of ______ in an atom._protons,electrons,neutrons)
(v)The solubility of gas in liquid ______ with rise in temperature.(decreases,increases).

Answer 1

a. Distillation
b.oxidised
c.second
d . protons
e.increasr

Answer 2

(iii) group -2

Period- 4 th