Which of the following properties increases from left to right along the period but decreases down the group in the Periodic Table? I. Atomic Number ii. Ionization energy iii. Metallic character iv. Electron affinity

• A) ii and iii only
• B) ii and iv only
• C) iii and iv only
• D) i and ii only

The molecular shape and bond angle of water are respectively

• A) linear, 180°
• B) bent, 109.5°
• C) tetrahedral, 109.5°
• D) bent, 105°

Which of the following describes the chemical property of acids?

• A) None of the above
• B) Acid + XCO3 → Salt + H2O + NH3
• C) Acid + NaOH →Normal salt + CO2
• D) Acid + XnCO3 → Salt + H2O + CO2

Hydrocarbons which will react with Tollen's reagent conform to the general formula

• A) CnH2n
• B) CnH2n+2
• C) CnH2n−2
• D) CnH2n+1OH

Na2CO3+ 2HCl →2NaCl + H2O + CO2 The indicator most suitable for this reaction should have a pH equal to

• A) 5
• B) 7
• C) 3
• D) 9

Which of the following will give a precipitate with an aqueous solution of copper (I) chloride?

• A) But-2-ene
• B) But-1-ene
• C) But-2-yne
• D) But-1-yne

Which two gases can be used for the demonstration of the fountain experiment?

• A) SO3 and NH3
• B) SO2 and NH3
• C) HCl and NH3
• D) SO2 and HCl

Which of the following reactions is an oxidation process?

• A) 2H^+ + 2e^-→H2
• B) 2O2^−+ 4e^−→O2
• C) OCl^−+ H2O + 2e^−→2OH^−+ Cl^−
• D) Cl + e^−→Cl^−

Which process(es) is/are involved in the turning of starch iodide paper blue-black by chlorine gas?

• A) chlorine attacks the starch to give the blue-black color
• B) chlorine attacks the iodide ion to give the blue-black color
• C) chlorine oxidizes the iodide ion to produce iodine which attacks the starch to give the blue-black color
• D) iodine attacks the starch to give the blue-black color

A radioactive nucleus has a half-life of 20 years, starting with 100,000 particles, how many particles will be left exactly at the end of 40 years

• A) 75,000 particles
• B) 35,000 particles
• C) 25,000 particles
• D) 50,000 particles