UNN Chemistry 2015/2016 DAY 1 Past Questions

2SO_2(g) + O_2(g) <---> 2SO₃ ∆H = -395.7KJ/mol
In the reaction above, the concentration of SO_3(g) can be increased by

Which of the following compounds is a normal salt?

Which of the following ions can be used as an oxidizing agent?

CO_2(g) + H₂O _{--> CO2(g) + H2(g)
Calculate the standard heat change of the reaction above if the standard enthalpies of formation of CO2(g), H2O(g) and CO(g) in KJ/mol are -394, -242, and -110 respectively.}

CH₃CH_{2Cl + KCN --> CH3CH2CN + KCl
In the reaction above, the cyanide is}

The bleaching action of chlorine gas is effective due to the presence of

Which of the following pairs of substances will react further with oxygen to form a higher oxide?

The salt formed between citric acid and sodium hydroxide in solution will be

On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as

Vulcanization involves the removal of

In an equilibrium reaction, which of the following conditions indicates the maximum yield of product will be obtained?

2C₂H_2(g) + SO_2(g) --> 4CO_2(g) + 2H₂O_(g)
In the reaction above, the mass of carbon(IV) oxide produced by burning 78g of ethyne is
[C =12, O = 16, H = 1]

Cu²⁺_(aq) + 4NH_3(g) <---> [Cu(NH₃)₄]²⁺_(aq)
In the reaction above, what is the effect of precipitating Cu²⁺_(aq) as CuS_(aq)?

```Use the diagram below to answer questions 14 and 15
```
Which of the following gases can be used to demonstrate the experiment?

```Use the diagram below to answer questions 14 and 15
```
The colour of the fountain water is