The hydrolysis of proteins by dilute mineral acids produces

Which of the following oxides causes acid rain?

The ratio of carbon atoms to hydrogen atoms in a hydrocarbon is 1 : 2. If its molecular mass is 56, what is its molecular formula?

What is the relative molecular mass of the compound below?

[H = 1.0; C = 12.0; O = 16.0]

Cathodic protection of metals is based on

If humid air is polluted by chlorine discharge, the air can be restored by sprinkling

The alkanol represented by the structure below is

Which of the following pairs of compounds would form a precipitate when their aqueous solutions are mixed?

Study the graph below and use them to answer questions 9 to 11.

Which of the graphs illustrates the variation of the rate of evolution of a gas from a given length of magnesium ribbon (y-axis) with increase in the concentration of the acid added (x-axis)?

Study the graph below and use them to answer questions 9 to 11.

Which of the graphs illustrates the variation of the pH of a given volume of strong acid solution (y-axis) with the volume of strong base titrated against it (x-axis)?

Study the graph below and use them to answer questions 9 to 11.

Which of the graphs illustrates the variation of the solubility of a salt in water (y-axis) with increase in temperature (x-axis), if the dissolution process is exothermic?

The formation of ethene from dehydration of ethanol can be described as

Which of the following gases is highly soluble in water at room temperature?

A molecule of phosphorus is

The most common method of preparing insoluble salts is by

What number of moles of oxygen would exert a pressure of 10 atm at 320 K in an 8.2 dm³ cylinder? [R = 0.082 atm dm³ mol⁻¹ K⁻¹]

The basic property of salts used as drying agents is

What would be observed when aqueous ammonia is added in drops and then in excess to a solution of copper (II) ions?

When CuSO₄(aq) is added to Pb(NO₃)₂(aq):

Consider the structure below:

How many carbon atoms does the parent chain contain?

Under which conditions of pressure (P) and temperature (T) would the volume of an inflated balloon increase?

The collision between ideal gas molecules are considered to be perfectly elastic because

Elements with high ionization energies would

Which of the following statements about Group VII elements is correct?

Consider the diagram below and use it to answer questions 25 and 26.

Which of the following cell notations represent the diagram?

Consider the diagram below and use it to answer questions 25 and 26.

Which of the following half reaction equations represent the reaction at the cathode?

The reactivity of fluorine is high because of

How many coulombs of electricity would liberate 1.08g of Ag from a solution of silver salt? [Ag = 108.0; 1F = 96500 C]

The Bohr model of the atom proposed the existence of

At 25 °C, evaporation of a 100 cm³ solution of K₂CO₃ to dryness gave 14 g of the salt. What is the solubility of K₂CO₃ at 25 °C? [K₂CO₃ = 138].

Student X titrated 25 cm³ of Na₂CO₃(aq) with 0.1 mol dm⁻³ HCl, using methyl orange as indicator.

Student Y carried out the same exercise but used phenolphthalein as indicator. Which of the following statements about the titration is true?

What is the concentration of a solution which contains 0.28 g of potassium hydroxide in 100cm³ of solution? [KOH = 56]

What is the empirical formula of a hydrocarbon containing 0.160 moles of carbon and 0.640 moles of hydrogen?

Which of the following species has the largest ionic radius?

Which of the following statements is correct about ionization energy? It

Potassium trioxonitrate (V) can be obtained from its solution by

The region around the nucleus where electrons can be located is called

Protons and electrons are called fundamental particles because they

Consider the following energy profile diagram and use it to answer questions 41 to 43.

The activation energy of the reaction is

Consider the following energy profile diagram and use it to answer questions 41 to 43.

The enthalpy change of the reaction is

consider the following energy profile diagram and use it to answer questions 41 to 43

The energy profile diagram illustrates

How many molecules of oxygen would occupy a volume of 2.24 cm³ at s.t.p.?
[Molar volume at s.t.p. = 22,400 cm³,Avogadro's number = 6.02 × 10²³]

Which of the following pairs of molecules form hydrogen bonds?

Which of the following statements about elements in Group VII is correct?

Electrovalent compounds normally

A coordinate covalent bond could be formed between

Which of the following scientists discovered the electron?