UNIZIK Chemistry 2015/2016 Day 2 Past Questions

Which of the following metals burns with a brick-red flame?

A trihydric alkanol is

An oxide XO₂ has a vapour density of 32. What is the atomic mass of X?

The pollution from petroleum spillage in rivers and lakes can best be dispersed by

For the reaction NH₄NO₂ ---> N₂ + 2H₂, calculate the volume of nitrogen that would be produced at STP from 320g of the dioxonitrate (III) salt.(Relative atomic masses: N = 14, 0 = 16, H = 1).

5.00g of hydrated salt of barium when heated to a constant weight gave 4.26g of anhydrous salt with a molecular weight of 208. The number of molecules of water of crystallization in the hydrated salt is

The number of atoms of chlorine present in 5.85g of NaCl is [Na = 23, Cl = 35.5, Avogadro's Numbcr = 6.02 x 10²³]

300cm³ of a gas has a pressure of 800mmHg. If the pressure is reduced to 650 mmHg, find its volume.

Which of the following metals burns with a brick-red flame?

²³Na₁₁ + ¹n₀ ---> ²⁴Na₁₁
The reaction above is an example of