Chemistry — 2009
WASSCE · 53 questions · Answers included
53 questions
Which of the following scientists discovered the neutron?
How many protons does 40 20 Ca contain?
If 100 atoms of element X contains 70 atoms of 9 X and 30 atoms of 11 X, calculate the relative atomic mass of X
Consider the reaction represented by the equation: 238 92 U + 1 0 → 139 56 Ba + 94 36 Kr + 3 1 0 n. The reaction represents a
How many orbitals are associated with the p-sub energy level?
Which of the following elements has the electronic configuration:1s 2 2s 2 2p 6 3s 2 3p 1 ? [ 11 Na, 13 A1, 14 N, 16 S]
The following properties are characteristics of transition elements except
Which of the following ions is isoelectronic with neon? [\(_3\)Li, \(_9\)F, \(_{10}\)Ne, \(_{17}\)CI,\(_{19}\)K ]
Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?
An element Q forms a compound QCI 5 . In which group of the periodic table is Q?
Which of the statements about the behaviour of the atom is correct?
Which of the following properties of covalent compounds is not correct? They
Which of the following arrangements is in order of increasing ionization energy?
In bonded atoms, increase in electronegativity difference,
Which of the following molecules is not linear in shape?
The number of particles in one mole of a chemical compound is the
How many molecules are there in 14 g of nitrogen at s.t.p.? [N = 14, Avogadro's constant = 6.02 x 10\(^{23}\) mol-1]
Consider the reaction represented by the equation: 2NaHCO 3 → Na 2 CO 3 + H 2 O + CO 2 . What is the mass of sodium trioxocarbonate (lV) produced by the complete decomposition of 33.6 g of sodium hydrogen trioxocarbonate (IV)? [NaHCO 3 = 84, Na 2 CO 3 = 106]
What is the percentage by weight of calcium in Ca(OCI) 2 ? [Ca = 40, Cl = 35.5, O = 16]
What is the value of -14 o C on the Kelvin temperature scale?
Which of the following expressions correctly represents Charles' law?
In a mixture of gases which do not react chemically together, the pressure exerted by the individual gases is called
In a chemical reaction, ∆H is positive when
Consider the reaction represented by the following equation: H 2(g) + \(\frac{1}{2}\) O (g) → H 2 O (g) ∆H =-285.8 KJmo -1 ∆H represents the enthalpy of
Salts that contain water of crystallization are said to be
Which of the following dilute acids does not react with metals to liberate hydrogen?
Which of the following compounds is not a double salt?
Which of the following hydroxides will readily dissolved in water?
Which of the following acids from normal salt only?
A solution that contains as much solute as it can dissolve at a given temperature is said to be
Which of the following salts is insoluble in water?
Which of the following statement is correct? The solubility of
A catalyst increases the rate of chemical reaction by
Which of the following factors will affect the rate of the reaction represented by the equation? 2HCI (aq) + CaCO 3(s) → CaCI 2(aq) + H 2 O (I) + CO 2(g) l. Pressure ll. Concentration III. Nature of reactants IV. Temperature
Which of the following substances is the anode in the dry Leclanche cell ?
Consider the reaction represented by the equation: 2H 2 SO 4(aq0 + C (s) → 2H 2 O (l) + 2SO 2(g) + CO 2(g) H 2 SO 4 is acting as
Which of the following oxides of nitrogen has oxidation number of + 1?
The separation of petroleum fractions depends on the differences in their
Which of the following raw materials is used in the plastic industry ?
The product of the reaction between C 2 H 5 OH and concentrated H 2 SO 4 at 170 o C is
When protein is heated to a high temperature it undergoes
What is the molecular formula of a compound with empirical CH 2 O and vapour density of 90? [H = 1, C = 12, O = 16]
What is the product of the reaction between propene and 1 mole of hydrogen iodide?
Ethanol reacts with excess acidified K 2 Cr 2 O 7 to produce
Dry hydrogen chloride when dissolved in methylbenzene
A consequence of global warming is
The major product in the solvay process is
Which of the following alloys does not contain copper? l. Brass II. Bronze III. Steel
The electron configuration of carbon atom in its excited state is [ 6C]
The electron configuration of carbon atom in its excited state is [ 6 C]
An important medical use of nuclear radiations is
Which of the following elements exhibits the same chemical properties as the atom \(\frac{35}{17}\)X? An element with
Which of the following noble gases has electronic structure similar to that of N in NH\(_3\)? [\(^{14}_7\)N]