Tag: csir previous year question

When a radioactive phosphorus is incorporated into DNA strand, the phosphodiester bond generally break after a short while because- (1) The bond strength of phosphorus decreases (2) Phosphorus on radioactive […]

9. Half-life of radioactive material does not depend upon (1) Initial concentration of material (2) Decay constant (3) Type of radioisotope (4) Energy emission Understanding Half-Life: What Factors Do Not […]

Arrange them according to decreasing order of strength (1) sp3>sp2>sp1 (2) sp1>sp2>sp3 (3) sp3>sp1>sp2 (4) sp1>sp3>sp2 Hybridization and Bond Strength: Arranging sp³, sp², and sp¹ Orbitals Understanding Hybridization and Bond […]

What would be approx. energy released on breaking H- H covalent bond (1) 4.32 x 105 J/mol (2) 1 x 10-19 J/mol (3) 5 x 10-19 J/mol (4) 8 x […]

Which of the following bonds will be most difficult to break? (1) C-O (2) C-P (3) C-N (4) C-S Strongest Covalent Bonds: Which Bond is Hardest to Break? What Determines […]

The interaction energy between atom A and B is 400 kJ/mol-1. The type of interaction between them is (1) pi – pi. (2) covalent. (3) ion-dipole. (4) hydrogen bond. Understanding […]

Covalent bond formation between two atoms takes place by (1) Transfer of electron from one atom to other (2) One Side sharing of electrons (3) Electron sharing by two electronegative […]

In crystalline NaCl, how many chloride ions surround each sodium ion? (1) Four (2) Six (3) Eight (4) Ten Crystal Structure of NaCl: Coordination Number and Ionic Arrangement What is […]

 2. Which of the following pair represents isotones? (1) 3H, 4He                                           (2) 15N, 14N1 (3) 140Ba, 140Th                                     (4) 1H, 3H   Understanding Isotones: A Guide to Identifying Nuclear Similarities What […]