Q2.Dmitri Mendeleev (1834-1907) and the German chemist, Lothar Meyer (1830-1895) proposed arranging elements in
Answer : Option CExplaination / Solution:
If the elements are arranged in the order of their increasing atomic weights, after a regular interval similiar properties of elements are repeated.
Q5.Transport of water and mineral in plants take place through
Answer : Option CExplaination / Solution:
Transport of water and mineral in plant take place through xylem tissue present in vascular bundles. Vessels and tracheids are main water conducting elements of xylem.
Answer : Option DExplaination / Solution:
The maximum oxidation state shown by a p-block element is equal to
the total number of valence electrons (i.e., the sum of the s and
p-electrons).
P:[Ne]3s23p3.
Total valence electrons =5 so it will show +5 oxidation state. The
stability of +5 oxidation state decreases down the group due to inert
pair effect.
Q8.Thermodynamics is the branch of physical science concerned with
Answer : Option AExplaination / Solution:
Thermodynamics deals with heat and its transformation from one form to another.
The branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.