Which hydrocarbon does NOT exhibit structural isomerism?
- A. C3H6
- B. C4H6
- C. C4H8
- D. C4H10
- E. C5H12
What is formed when starch is completely hydrolysed?
- A. fructose
- B. glucose
- C. lactose
- D. maltose
- E. sucrose
Ethene decolourises acidified potassium tetraoxomanganate(VII) solution. Which gas will decolourise bromine water?
- A. CH4
- B. C2H6
- C. C3H6
- D. C3H8
- E. C6H6
Which method is used for the purification of copper from its ore?
- A. distillation
- B. electrochemical
- C. electrolysis
- D. neutralization
- E. reduction
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)
- A. 0.01
- B. 0.05
- C. 0.1
- D. 0.5
- E. 2.8
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]
- A. \(\frac{760\times 22.4\times 308}{750\times 273\times 35.5} dm^3 \)
- B. \(\frac{760\times 22.4\times 308}{750\times 273}dm^3 \)
- C. \(\frac{750\times 22.4\times 35.5}{760\times 273}dm^3\)
- D. \(\frac{760\times 22.4\times 35.5}{750\times 22.3\times 273}dm^3 \)
- E. \(\frac{760\times 22.4\times 35.5}{750\times 308}dm^3 \)
How many Faradays of electricity are required to liberate 9g of aluminium? [Al = 27]
- A. 0.1
- B. 0.3
- C. 1
- D. 2.7
- E. 3
Which metal bromide is widely used in photography?
- A. calcium bromide
- B. magnesium bromide
- C. potassium bromide
- D. silver bromide
- E. sodium bromide
What change will occur during the electrolysis of brine using carbon electrodes?
- A. Chlorine will be given off at the anode
- B. Oxygen gas will be given off at the anode
- C. Sodium will be deposited at the cathode
- D. The resulting solution, after electrolysis, will be acidic.
- E. The volumes of hydrogen and chlorine given off during the same time are equal
Which metal is a constituent of both bronze and solder?
- A. copper
- B. lead
- C. silver
- D. tin
- E. zinc
An atom of element X has an electronic configuration of \( 1s^22S^22p^63s^23p^3. \) In which group of the periodic table is X?
- A. \( \text{0} \)
- B. 2
- C. 3
- D. 4
- E. 5
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]
- A. 6.89g
- B. 6.93g
- C. 6.98g
- D. 7.04g
- E. 7.12g
Naturally occurring lithium consists of 90% \( ^7_3Li \text{ and 10% } ^6_3 Li. \) What is the relative atomic mass of lithium?
- A. 6
- B. 6.8
- C. 6.9
- D. 7
- E. 7.1
Why does the treatment of cotton fabrics with dilute acids weaken the materials?
- A. Cotton is hydrolysed completely to glucose
- B. The fabrics are soluble in dilute acids
- C. The molecular chains are partially broken
- D. The molecular chain length f the fabric increases
- E. The thread holding the fabric together Is completely destroyed.
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]
- A. CH3Br
- B. C2H5Br
- C. C3H5Br
- D. C3H7Br
- E. C4H9Br
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]
- A. 3.2 g
- B. 3.25 g
- C. 6.4 g
- D. 6.5 g
- E. 64.0 g
Which element is the most electronegative?
- A. calcium
- B. fluorine
- C. iodine
- D. oxygen
- E. sodium
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?
- A. A yellow precipitate of Cr(OH)3 is formed
- B. An orange precipitate of Cr(OH)3 is formed
- C. The colour changes from orange to yellow
- D. The colour changes from yellow to orange
- E. There is no visible reaction.
What is the IUPAC name of CH3CCI=C(CH3)2?
- A. 2-chloro -3 methylbut -2yne
- B. 2 -chloro -3 methylbut -2ene
- C. 2 -chloro -3 methylbutene
- D. 3- methyl -2-chlorobut -2-ene
- E. 3- methyl -2. chlorobut -2 yne
Which formula is used to indicate the degree of acidity of an acid?
- A. \( [H^+] = ^{\text{mass of acid relative}} molecular mass of acid \)
- B. F = number of H+ = ions x molar mass of the acid
- C. Kw = [H+][OH-]
- D. pH = - log10[H+]
- E. pKa = -log10Ka
Which compound will give propane when it Is dehy drated by an excess of hot, concentrated tetraoxosvlphate(VI) acid?
- A. CH3CH2CHO
- B. CH3CH2CH2OH
- C. CH3CH2COQH
- D. CH3CH20CH
- E. CH3CH3OH