Ripening of fruits is hastened by using

• A. Ethanol
• B. Ethane
• C. Ethene
• D. Ethyne

Phenolphthalein in acidic solution is

• A. red
• B. orange
• C. colourless
• D. yellow

Which of the following elements has the electronic configuration: 1s²2s²2p⁶3s²3p¹

• A. Al
• B. Na
• C. N
• D. S

What are the two gases associated with the formation of acid rain?

• A. CO2 and HCI
• B. CO2 and N2
• C. CO2 and NO2
• D. HCI ans SO2

A particle that contains 8 protons, 9 neutrons and 7 electrons could be written as

• A)
  \(^{16}_8O\)
• B)
  \(^{17}_8O^+\)
• C)
  \(^{17}_9O^+\)
• D)
  \(^{17}_8O\)

220g of carbon dioxide contains ----- moles

• A. 5
• B. 6
• C. 3
• D. 4

Detergents are manufactured with straight hydrocarbon chains so as to make them

• A) soluble
• B) biodegradable
• C) cheaper
• D) foamy

The curve depicts titration between

• A) Strong acid and strong base
• B) Strong acid and weak base
• C) Weak acid and weak base
• D) Weak acid and strong base

1.0dm\(^3\) of distilled water was used to wash 2.0g of a precipitation of AgCl. If the solubility product of AgCl is 2.0 \(\times\) 10\(^{10}\) mol\(^2\)dm\(^6\), what quality of silver was lost in the process?

• A)
  2.029 \(\times\) 10\(^{-3}\) mol dm\(^{-3}\)
• B)
  1.414 \(\times\) 10\(^{-3}\) mol dm\(^{3}\)
• C)
  2.029 \(\times\) 10\(^{-5}\) mol dm\(^{3}\)
• D)
  1.414 \(\times\) 10\(^{-5}\) mol dm\(^{3}\)

The empirical formula of a hydrocarbon containing 0.12 mole of carbon and 0.36 mole of hydrogen is

• A. CH₂
• B. CH₃
• C. C₂H₂
• D.CH