The ions are responsible for electric potential across the cell membrane are
(A) Ca+2 & Mg+2
(B) Na+ & K+
(C) Ca+ & Zn+2
(D) Cs+ & Rb+

Hormone, responsible for raised level of Ca^(+2) in blood is

Read the following four statements (A–D) :- (A) The electrical potential difference across the resting plasma membrane is called as the resting potential (B) Na+ – K+ pump transports 3Na+ outwards for 2K+ into the cell passively (C) During excited state the outer surface of the membrane becomes positively charged (D) Action potential is infact termed as nerve impulse How many of the above statements are false?

Calamine is an ore of (a) Hg (b) Zn ( c) Ca (d) Cd

Mineral involved in photolysis of water are (a) Mn" " (b) Ca (c) Mg" " (d) Cl .

Which one of the following sets of ions represents the collection of isoelectronic species? (Atomic numbers : F = 9, CI = 17, Na = 11, Mg = 12,Al = 13, K = 19, Ca = 20, Sc =21)

Assertion: Na and K ions are necessary for muscle contraction. Reason: Na and K concentrationn changes across the muscle cell membrane resulting in development of potential difference.

Name one species that will be isoelectronic with the following atoms or ions. (a) Ca^(2+) , (b) Ne , (c ) Cl^(ɵ) ,(d) Rb^(o+)

How many of following metals impart a characteristic colour to the Bunsen flame ? (i) Na " " (ii) Li " " (iii) K " " (iv) Ba (v) Sr " " (vi) Mg " " (vii) Rb " " (viii) Cs (ix) Be " " (x )Ca " " (x i)Cu

Metal present in cytochrome oxidase is (a) Cu (b) Fe (c) Mg (d) Ca

The most electropositive element is (A)NA (B)Cu (C)Cs (D)Ca