Chemistry — 2011

How many isotopes has hydrogen?

Which of the following electrons configurations correctly represents an inert element?

What type of reaction is represented by the following equation?\(\frac{2}{1}\)D\(\frac{3}{1}\)H → \(\frac{4}{4}\)He + \(\frac{1}{0}\)n + energy

Which of the following ions has the electron configuration 2,8,8?

An element with the electron configuration of 1s 2 2s 2 2p 6 would have a combining power of

Rare gases are stable because they

Which of the following elements would produce coloured ions in aqueous solution?

The energy change that accompanies the addition of an electron to an isolated gaseous atom is

Which of the following hydrohalic acids is the weakest?

Which of the following arrangements is in order of increasing metallic property?

Chlorine, bromine and iodine belong to the same group and

Which of the following elements can conveniently be placed in two groups in the periodic table ?

The bond formed when two electrons that are shared between two atoms are donated by only one of the atoms is

When element 20 A combines with element 8 Y,

In metallic colids, the forces of attraction are between the mobile valence electrons and

Which of the following statements about displacement reaction is correct?

The volume occupied by 17g of H 2 S at s.t.p. is [H = 1.00, S = 32.0, Molar volume = 22.4 dm 3 ]

Consider the reaction represented by the following equation: xKMnO 4(aq) + ySO 2(g) + zH 2 O (I) → K 2 SO 4(AQ) + 2MnSO 4(aq) + 2H 2 SO x,y and z are respectively

What is the amount of magnesium that would contain 1.20 x 10 24 particles? [Mg = 24, Avogadro's constant = 6.02 x 10 23 ]

The number of atoms in one mole of a substance is equal to the

Which of the following statements about a molar solution is correct? it

A gas that is collected by upward delivery is likely to be

Bubbling excess carbon (IV) oxide into calcium hydroxide solution results in the formaton of

The equation P = \(\frac{K}{V}\) illustrates

The initial volume of a gas at 300 K was 220 cm 3 Determine its temperature if the volume became 250 cm 3

Which of the following equimolar solutions has the highest conductivity?

The colour of phenolphthalein indicator in alkaline solution at the end-point of an acid-base titration is?

Which of the following statements about enthalpy of neutralization is correct? It

When NH 4 CI was dissolved in water, the container was cold to touch. This implies that

Which of the following metallic oxides is amphoteric?

On evaporation to dryness, 250 cm3 of saturated solution of salt X with relative molar mass 101 gave 50.5g of the. What is the soluility of the salt?

Consider the following reaction equation: X(g) + Y(g) ⇌ XY(g); ∆H = + 220KJ mol-1 If the temperature of the system is increased, the

What is the value of n in the following equation? Cr 2 O 7 2- + 14H + + ne - → 2Cr 3+ + 7H 2 O

What mass of copper would be formed when a current of 10.0 A is passed through a solution of CuSO 4 for 1 hour? [Cu = 63.5; 1F = 96500C]

Which of the following metals could be used as sacrifical anode for preventing the corrosion of iron?

Consider the following electrochemical cell notation: M(s) / M2+ (aq)// H+ (aq)/ H2(g). The value of the electrode potential is positive when?

Which of the following compounds determines the octane rating of petrol?

Which of the following compounds would react with ethanoic acid to give a sweet smelling liquid?

Which of the following separation techniques would show that black ink is a mixture of chemical compounds?

The following substances are examples of addition polymer except

When bromine is added to ethene at room temperature, the compound formed is

The compound that makes palm wine taste sour after exposure to the air for few days is

The reagent that can be used to distinguish ethene from ethyne is

The following substances are ores of metals except

Which of the following processes does not involve the use of limestone?

Aluminium is extracted electrolysis from