A blue solid, T, which weighed 5.0g was placed on a table. After 8 hours, the resulting pink solid was found to weigh 5.5g. It can be inferred that substance T?

• A. is deliquescent
• B. is hydroscopic
• C. has some molecules of water of crystallization
• D. is efflorescent

Na₂S₂O₃(aq) + 2HCl(aq) → 2NaCl(aq) + H₂O(l) Which of the following would introduce the greatest increase in the rate of the chemical reaction above?

• A. An increase in temperature and decrease in the concentration of the reactant
• B. A decrease in the volume and increase in the pressure of the reactant
• C. A decrease in the temperature and an incease in the concentration of the reactant
• D. An increase in temperature and an increase in the concentration of the reactant

The process of extraction of iron from its ore is

• A. decomposition
• B. oxidation
• C. reduction
• D. sublimation

The active reducing agent in the blast furnace for the extraction of iron is?

• A. carbon
• B. limestone
• C. carbon(II)oxide
• D. calcium oxide

What happens to the position of equilibrium if a reversible reaction is subjected to a decrease in temperature?

• A. The position of equilibrium shifts to the left
• B. The position of equilibrium shifts to the right.
• C. The position of equilibrium remains unchanged
• D. The reaction stops

Which of the following compounds can be represented by the molecular formula C₂H₆O?

• A. Propanel
• B. Ethanol
• C. Methanoic acid
• D. Glucose

Which of the following are produced when ammonium trioxonitrate (V) crystals are cautiously heated in a hard glass round bottomed flask?

• A. N₂O and steam
• B. NO₂ and ammonia
• C. N₂O₂ and NO₂
• D. NO and NO₂

A particle that contains 9 protons, 10 neutrons and 10 electrons is a

• A. negative ion
• B. positive ion
• C. neutral atom of non-metal
• D. neutral atom of a metal

2CH\(_3\)COOH + Zn \(\rightarrow\) ? The product of this reaction is

• A)
  (CH\(_3\)COO)\(_2\)Zn + Zn
• B)
  CH\(_3\)COOCH\(_3\) + Zn
• C)
  (CH\(_3\)COO)\(_2\)Zn + H\(_2\)
• D)
  CH\(_3\)COOH + CH\(_4\)

Soluble salts can be prepared by the following methods except

• A. neutralization
• B. reaction of an acid with trioxocarbonate(IV) salt
• C. double decomposition
• D. reaction of an acid with electropositive metals