Question

21. Assertion (A) - Atom is electrically neutrol

Reason (R) – A nutrol Partice, neutron is present in the nucleus of atom.

22. Assertion (A) - Atomic mass of aluminum is 27.

Reason (R) - An atom of aluminum is 27 times heavir than 1/12 of the mass of carbon-12 atom.

23. Assertion (A) - A mixture of Acetone and methanol can be separated by fractional distribution.

Reason (R) - The difference between boiling point of acetone and methanol is very less.

24. Assertion (A)- Prokaryatic Cells are Primitive and larger than eukaryotic cells.

Reason (R) - Prokaryotic cells lock cytoplasmic organelles

25. Assertion (A) – Lateralmeristem are present along the side of various organs in pints.

Reason (R) - These help in the healing of wounds in plants.​

Answer 1

Answer:

21.(B)

Because an atom as a whole is electrically neutral because of the presence of proton in the nucleus and electron in the extra nuclear portion.

22.(A)

Because an atom of aluminium is 27 times ,which is the mass of aluminium, heavier than 1/12th of the mass of C-12 isotope.