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Question 1 Report
Small amounts of compounds of transition metals are sometimes added to glass during manufacture in order to make the glass
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Question 2 Report
The pH of water is 7.
What is the pH of orange juice?
Question 4 Report
What is the number of moles of NaHCO3in 250cm3 of its solution if the solution contains 8.4 g of NaHCO3 in 1 dm3 of the solution. [Na = 23, 0 = 16, C = 12, H = 1)
Question 5 Report
Which statement is NOT true about the composition of starch?
Question 8 Report
Which formula is used to indicate the degree of acidity of an acid?
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Question 10 Report
What is the concentration (in mol dm3) of a solution containing 28 g of potassium hydroxide per 100 cm3 of solution? (K=39; H=1; 0=16)
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Question 11 Report
The boiling point of water is higher than the boiling point of ethanol because
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Question 13 Report
Why is tetraoxosulphate(VI) acid NOT used for making carbon dioxide from calcium carbonate? It is
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Question 14 Report
Naturally occurring lithium consists of 90% \( ^7_3Li \text{ and 10% } ^6_3 Li. \) What is the relative atomic mass of lithium?
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Question 15 Report
Which separation technique is routinely applied in the petroleum industry?
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Question 16 Report
An atom of element X has an electronic configuration of \( 1s^22p^33s^23p^2. \) In which group of the periodic table is X?
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Question 17 Report
What is the IUPAC name of CH3CCI=C(CH3)2?
Question 18 Report
Which hydrocarbon does NOT exhibit structural isomerism?
Question 20 Report
Ethene decolourises acidified potassium tetraoxomanganate(VII) solution. Which gas will decolourise bromine water?
Question 21 Report
The number of hydrogen ions in 1.0dm6.00x103 of a 0.25 mole dm6.00x10-3 tetraoxosulphate(Vl) acid solution is
[Avogadro constant = 6.0 x 1 0]
Question 22 Report
What mass of silver is deposited when a current of 2.6 A is passed through a solution of a silver salt for 40 minutes? [Ag= 108 ; F=96500C]
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Question 23 Report
An organic compound gave the following results on analysis: C = 29.3% ; H = 5.7%; Br = 65%.
What is the empirical formula of the compound? [C = 12, H = 1, Br=80]
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Question 24 Report
B is an isotope of the element \(^{238} _{92}Ur\). The isotope B has
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Question 25 Report
Why does the treatment of cotton fabrics with dilute acids weaken the materials?
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Question 26 Report
What change will occur to the equilibrium mixture
\( 2CrO^{2-}_4(aq) + 2H^+(aq) ⇔ Cr_2O^{2-}_7(aq) + H_2O(l) \) when excess sodium hydrogen solution is added?
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Question 27 Report
In the reaction 2H2S(g) + SO2(g) → 2H2SO(I)+3S(s)SO2is acting as _agent
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Question 29 Report
How many Faradays of electricity are required to liberate 9g of aluminium? [Al = 27]
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Question 30 Report
What change will occur during the electrolysis of brine using carbon electrodes?
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Question 31 Report
At s.t.p, a mole of chlorine occupies 22.4dm3. If the temperature is changed to 35°C and the pressure to 750mHg the of the new volume will be [Cl = 35.5]
Question 33 Report
Which compound will give propane when it Is dehy drated by an excess of hot, concentrated tetraoxosvlphate(VI) acid?
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Question 34 Report
What is the change in the oxidation number of phosphorus in the following reaction?
4P(s) + 5O2(ag) → 2P2O5(s)
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Question 35 Report
What mass of copper is deposited when 6.5g of granulated zinc reacts with excess copper(II) tetraoxosulphate(VI) solution?
The equation for the reaction is: Zn(s) + \( CuSO_4(aq)→ ZnSO_4(aq)+ Cu(s)\)[CU= 64; Zn=65]
Question 36 Report
Which is NOT a synthetic polymer?
Question 38 Report
The reaction C2H6 → C2H + H2 is known as
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