Answer:
A is the right answer
Explanation:
In double replacement reaction two compounds combines to give other two compounds
As example:
CaCl2 + 2AgNO3 = Ca(NO3)2+ 2AgCl
Red Litmus paper turns blue
Answer:
Explanation:
In lime water 
litmus paper turns 
because lime water is alkaline.
B because isotopes have the same number of protons but a different number of neutrons
Answer: option D. CO2 and SO2
Explanation:
Answer:
Arsenic, As, has atomic number 33, which is the number of protons in the nuclei of its atoms. A neutral As atom would also have 33 electrons. The electron configuration of a neutral arsenic atom is [Ar]3d104s24p3
Explanation:
