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Chemistry Past Questions
Which of the following will change when a catalyst is added to a chemical reaction
- A. The activation energy
- B. The potential energy of the reactants
- C. The heat of reaction
- D. The potential energy of the products
Which of the following statements is true of a proton.
- A. The total mass of the protons in a particular nucleus always half the nuclear mass
- B. The mass of a proton is 1840 times the mass of an electron
- C. The mass proton is 1.0008g
- D. The mass of a proton is one-twelfth the molar mass of carbon
Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the
- A. Increase in nuclear charge
- B. Decrease in screening effect
- C. Increase in screening effect
- D. Decrease in nuclear charge
What is the correct IUPAC name for NO2
- A. Dioxonitrate(III) ion
- B. Dioxonitrate(IV) ION
- C. trioxonitrate(iii) ion
- D. trioxonitrate(iv) ion
The most suitable metal that can be used as a lightening conductor is
- A. Aluminium
- B. Iron
- C. Copper
- D. Silver
When a salt loses its water of crystallization to the atmosphere on exposure, the process is said to be
- A. Deliquescence
- B. Effervescence
- C. Efflorescence
- D. Fluorescence
The chemiocal used for coagulation in water purification is
- A. Aluminum tetraoxosulphate(VI)
- B. Copper tetratoxosulphate (VI)
- C. Sodium tetraoxosulphate(VI)
- D. Calcium tetraoxosulphate (VI)
The order in which a mixture of sand ammonium chloride and sodium chloride can be separated is
- A. Sublimation dissolution filtration evaporation
- B. Dissolution dryness filtration evaporation
- C. Filtration sublimation evaporation dryness
- D. Dissolution filtration sublimation evaporation
The density of a certain gas is 1.98g dm-3 at s.t.p. What is the molecular mass of the gas [Molar volume of a gas at s.t.p = 22.4dm-3]
- A. 26.0g
- B. 31.0g
- C. 54.0g
- D. 44.0g
When sodium reacts with water, the resulting solution is
- A. weakly acdic
- B. neutral
- C. acidic
- D. alkaline