Chemistry — 2006

How many orbitals are in the d-sub shell?

An element X has isotopic masses of 6 and 7. if the relative abundance is 1 to 12.5 respectively, what is the relative atomic mass of X?

An atom 238 92 X decays by alpha particle emission to give an atom Y. The atomic number and mass number of Y are

If 1 mole of sodium contains 6 x 10 23 atoms, how many atoms are contained in 0.6 g of sodium? [Na = 23]

If 20 cm3 of distilled water is added to 80cm 3 of 0. 50 mol dm-3 hydrochloric acid, the new concentration of the acid will be

Consider the reaction represented by the equation. 2NaHCO 3(s) \(\rightarrow\) 2Na 2 CO 3(S) + CO 2(g) + H 2 O (g) what volume of carbon (IV)oxide at s.t.p is evolved when 0. 5 moles of NaHCO 3 is heated? [Molar volume = 22.4 dm 3 at s.t. p]

Considered the reaction: H + (aq) + OH - (aq) → H 2 O (l) . The energy change taking place in the reaction above is enthalpy of

Which of the following processes is an endothermic reaction?

Which of the following aqueous methods cannot be used to distinguish between a strong acid and a a weak acid?

The indicator used in neutralizing CH 3 COOH and NaOH solution has pH range of

When aqueous ammonia is added to one of the following solutions,a white precipitate which dissolved in excess ammonia is formed Identify the solution.

Which of the following compounds absorbs moisture from the atmosphere and dissolves in it?

Consider the reaction represented by the equation: 2SO\(_{2(g)}\) + O\(_{2(g)}\) ⇌ 2SO\(_{3(g)}\); ∆H = - 197 kJmol\(^{-1}\). Which of the following conditions will not increase the yield of sulphur (VI) oxide?

Electrolysis is applied in the following processes except

The oxidation number of iodine in the iodate ion (IO - 3 ) is

Metals can be extracted from their ores by a process involving

Consider the reaction: 2AI (s) + 6H + (aq) → 2AI 3+ (aq) + 3H 2(g) . What is the total number of moles of electrons transferred from the aluminium atoms to the hydrogen ions?

In the reaction represented by the equation. 5Fe 2+ (aq) + MnO - 4(aq) + 8H + (aq) → 5Fe 3+ (aq) + Mn 2+ (aq) + 4H 2 O (l) which species is reduced?

Which of the following industrial processes is chlorines not used?

What type of reaction occurs between vegetable oil and plant ash extract?

Which of the following compounds is an alkanoate?

What is C a H b in the following equation? C a H b + 5O 2 → 3CO 2 + 4H 2 O

Greenhouse effect can be reduced by controlling

Waste plastics accumulate in the soil and pollute the environment because plastic materials are

Which of the following substance is an ore of iron?

The ammonium compound used in the manufacture of dry cells is

Which of the following equations represents a substitution reaction?