1Which one of the following can be broken down into simpler substances?aAmmoniabOxygencSulphurdIron fillingShow answer
4Which one of the following is equal to two moles of water(H₂O)?a1.084 × 10²⁵ moleculesb6.022 × 10²³ moleculesc1.204 × 10²⁴ moleculesd1.806 × 10²⁴ moleculesShow answer
5A compound contains:adifferent kinds of atoms mixed togetherbthe same kind of atoms mixed togethercdifferent kinds of atoms chemically combined togetherdthe same kind of atoms chemically combined togetherShow answer
7Hydrogen gas is:aa monoatomic gasba mixture of hydrogen atomsca diatomic gas with each molecule made up of two atomsda diatomic atom made up of two moleculesShow answer
8Which one of the following compounds has both empirical and molecular formula identical?abenzene (C₆H₆)bhydrogen peroxide (H₂O₂)cwater (H₂O)dglucose (C₆H₁₂O₆)Show answer
10Which one of the following group comprise of elements?aMercury, water, AmmoniabIodine, Tin, IroncCopper, Aluminum, MethanedCoal, Smoke, FogShow answer
11Which one of the following deals with the identity of a substance?aQualitative analysisbQuantitative analysiscPhysics analysisdClinical analysisShow answer
12Hair contains keratin proteins which are also present in nails and wool is an example of:aBiochemistrybInorganic chemistrycPhysical chemistrydOrganic chemistryShow answer
14What is the ratio of carbon and oxygen by mass in carbon dioxide (CO₂)?a3:10b4:12c3:8d4:8Show answer
18Free radicals are electrically:aPositively chargedbNegatively chargedcNeutraldAll of theseShow answer
19The number of protons and neutrons in the nucleus if the atomic number of an element is 17 and the mass number is 35, is:a17 and 18b17 and 19c17 and 20d17 and 21Show answer
20A mole of any substance contains:a6.022×10²² particlesb6.022×10²³ particlesc6.022×10²⁴ particlesd6.022×10²⁵ particlesShow answer
