Chemistry xii test 1
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This document contains a 25 question chemistry test covering various topics in periodicity, including atomic structure, ionization energy, electron affinity, and chemical bonding properties. The questions assess understanding of trends in atomic radius, ion size, electronegativity, melting points, oxidation states, and classification of elements such as coinage metals and halogens. The final question asks about the isotope of hydrogen called tritium.
Chemistry xii test 1
- 1. TEST-01 Chemistry XII Engr: Kashif Ali Magsi Page | 1 1. Which of the following has greatest tendency to lose electron? (a) F (b) Fr (c) S (d) Be. 2. Which of the following is isoelectronic with carbon atom? (a) Na+ (b) Al3+ (c) O2- (d) N+ 3. Ca2+ ion is isoelectronic with (a) Mg2+ (b) Na+ (c) Ar (d) Kr 4. Which of the following has highest first ionization potential? (a) Carbon (b) Oxygen (c) Nitrogen (d) Boron. 5. Which of the following has the smallest size? (a) Na+ (b) Mg2+ (c) Al3+ (d) CI 6. The atomic radius increases as we move down a group because (a) Effective nuclear charge increases (b) Atomic mass increases (c) Additive electrons are accommodated in new electron level (d) Atomic number increase. 7. Electron affinity depends on (a) Atomic size (b) Nuclear charge (c) Atomic number (d) Atomic size and nuclear charge both. 8. Two elements whose eletronegativities are 1.2 and 3.0, the bond formed between them would be (a) Ionic (b) covalent (c) Coordinate (d) metallic. 9. Ionic radii are (a) Directly proportional to square of effective nuclear charges (b) Inversely proportional to effective nuclear charge (c) Inversely proportional to square of effective nuclear charge (d) Directly proportional to effective nuclear charge. 10. Mark the correct statement: (a) Na+ is smaller than Na atom (b) Na+ is larger than Na atom (c) CI- is smaller than CI atom (d) CI- and CI are equal in size 11. The element with Z = 24 is placed in the period (a) 5 (b) 2 (c) 3 (d) 4 12. Which one of the following has the maximum electron affinity? (a) I (b) Br (c) CI (d) F 13. Higher value of electron affinity means_________ (a) Atom will lose electron easily (b) Atom will gain electron easily (c) Atom may form di-positive ion (d) The reason is unknown
- 2. TEST-01 Chemistry XII Engr: Kashif Ali Magsi Page | 2 14. Melting points of VII-A group ___________down the group. (a) Increase (b) Decrease (c) Remain constant (d)N.O.T 15. Oxidation state of an atom represents______ (a) No. of electrons gained (b) No. of electrons lost (c) No. of electrons gained or lost (d)None of above correctly represent it 16. Mendeleevs periodic table was based on (a) Atomic number (b) Electronic configuration (c) Atomic volume (d) Atomic mass 17. Elements present in a same group have the same (a) Atomic number (b) Molecular weight (c) Chemical properties (d) Electronic configuration 18. What is the symbol of the element with only three electrons and three protons? (a) Li (b) C (c) Ag (d) Cu 19. Elements with seven electrons in their valence shell are known as (a) Inert (b) Lanthanides (c) Halogens (d) Alkali metals 20. Which one of the following is not a coinage metal? (a) Au (b) Cu (c) Ag (d) Pd 21. The outer most orbital involved in chemical bonding is called (a) Molecular orbital (b) Complete orbital (c) Valence orbital (d) Free orbital 22. Elements which form basic oxides are (a) Electropositive (b) Electronegative (c) Inert (d) None of these 23. Which of the following is smallest in size? (a) K+1 (b) O-2 (c) F-1 (d) Na+ 24. Ionization energy is lowest for (a) Inert gases (b) Halogens (c) Alkali metals (d) Alkaline earth metals 25. An isotope of hydrogen is (a) Neptunium (b) Plutonium (c) Thorium (d) Tritium