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Question 1 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?
Answer Details
Question 2 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 4 Report
What change will occur during the electrolysis of brine using carbon electrodes?
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Question 5 Report
Which formula is used to indicate the degree of acidity of an acid?
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Question 6 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 7 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 10 Report
In the reaction 2H2S(g) + SO2(g) → 2H2SO(I)+3S(s)SO2is acting as _agent
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Question 11 Report
Why is tetraoxosulphate(VI) acid NOT used for making carbon dioxide from calcium carbonate? It is
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Question 12 Report
What is the IUPAC name of CH3CCI=C(CH3)2?
Question 14 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 16 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 17 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 18 Report
Which statement is NOT true about the composition of starch?
Question 19 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 20 Report
Why does the treatment of cotton fabrics with dilute acids weaken the materials?
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Question 21 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 22 Report
The boiling point of water is higher than the boiling point of ethanol because
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Question 23 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 24 Report
Ethene decolourises acidified potassium tetraoxomanganate(VII) solution. Which gas will decolourise bromine water?
Question 25 Report
Which separation technique is routinely applied in the petroleum industry?
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Question 27 Report
How many Faradays of electricity are required to liberate 9g of aluminium? [Al = 27]
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Question 28 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 30 Report
The reaction C2H6 → C2H + H2 is known as
Question 31 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 34 Report
Which hydrocarbon does NOT exhibit structural isomerism?
Question 35 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 36 Report
B is an isotope of the element \(^{238} _{92}Ur\). The isotope B has
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Question 37 Report
The pH of water is 7.
What is the pH of orange juice?
Question 38 Report
Which is NOT a synthetic polymer?
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