(i) Measurement of atomic mass of an element is very difficult? Give reason.
(ii) (i) Identify the bond betweenn H and F in HFF molecule. (ii) what properrty forms the basis of identification?

Measurement of atomic mass of an element is very diffcult ? Give reason .

A_(3)-_(5)B C_(5)-_(3)D AB and CD represent two strands of a DNA molecule. When this molecule undergoes replication, a replication fork is formed between A and C in the above. i. Name the template strands for replication. ii. Using which strand as the template, will there be continuous synthesis of a complementary DNA strand? iii. Complementary to which strand will Okazaki segments get synthesised. iv. What are template strands and Okazaki pieces? v. In which direction is a new strand synthesised?

A uniform magnetic field gets modified as shown, when two spectimens X and Y are placed in it. i. Identify the two specimens X and Y . ii. State the reason for the behaviour f the field lines in X and Y.

Which of the following statement (s) about the Modern Periodic Table is are incorrect (i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number (ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses (iii) Isotopes are placed in adjoining group (s) in the Periodic Table (iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number

Statement-I: The magnetic moment of para hydrogen is zero. Statement-II: The spins of two hydrogen atoms in para H, molecule neutralise each other.