When the kerosene fraction from petrol is heated at high temperature, a lower boiling liquid is obtained. This process is known as
- A. polymerization
- B. refining
- C. hydrogenation
- D. cracking
An organic compound with a vapour density 56.5 has the following percentage composition:C =53.1% N = 12.4%, O = 28.3%, H = 6.2%. The molecular formula of the compound is
Relative atomic masses: N = 14, O = 16, C = 12, H = 1 )
- A. C3H6O2N
- B. C5H6O2N
- C. (C5H7O2N)1/2
- D. C5H7O2N
- E. (C5H7O2N)2
The hybridization of the carbon atom in ethyne is
- A. sp 4
- B. sp 3
- C. sp2
- D. sp
- E. s
In the Haber process for the manufacture of ammonia, finely divided iron is used as
- A. an ionizing agent
- B. a reducing agent
- C. a catalyst
- D. a dehydrating agent
- E. an oxidizing agent
3Cl2 + 2NH3 \(\to\) N2 + 6HCl. In the above reaction, ammonia acts as
- A. a reducing agent
- B. an oxidizing agent
- C. an acid
- D. a catalyst
- E. a dry agent
An example of a neutral oxide is
- A. AL2O3
- B. NO2
- C. CO2
- D. CO
- E. SO2
From the reactions : ZnO + Na2O \(\to\) NaZnO and ZnO + CO2 \(\to\) ZnCO3 it may be concluded that zinc oxide is
- A. neutral
- B. basic
- C. acidic
- D. amphoteric
- E. a mixture
Which of the following statements is NOT true of carbon monoxide?
- A. CO is poisonous
- B. CO is readily oxidized at room temperature by air to form CO2
- C. CO may be prepared by reducing CO2 mixed with coke heated to about 1000oC
- D. CO may be prepared by heating charcoal with a limited amount of O2
- E. CO is a good reducing agent
Sulphur
- A. forms two alkaline oxides
- B. is spontaneously flammable
- C. burns with a blue flame
- D. conducts electricity in the molten state
- E. is usually stored in the form of sicks in water
An element that can exist in two or more different structural forms which possess the same chemical properties is said to exhibit.
- A. polymerism
- B. isotopy
- C. isomorphism
- D. isomerism
- E. allotrophy
Lime – water, which is used in the laboratory for the detection of carbon(iv)oxide is an aqueous solution of
- A. Ca(OH)2
- B. CaCO3
- C. CaHCO3
- D. CaSO4
- E. N2CO3
Which of the following methods may be used to prepare trioxonitrate (V) acid (nitric acid) in the laboratory?
- A. Heating ammonia gas with tetraoxosulphate (VI) acid
- B. Heating ammonium trioxonitrate (V) with tetraoxosulphate (VI) acid
- C. Heating sodium trioxonitrate (V) with tetraoxosulphate (VI) acid
- D. Heating potassium trioxonitrate (V) with calcium hydroxide
- E. Heating a mixture of ammonia gas and oxygen.
In dilute solution the heat of the reaction NaOH + HCl = NaCl + H2O is – 57.3kJ. Therefore the heat of the reaction 2NaOH + H2SO4 \(\to\) Na2SO4 + 2H2O is
- A. + 28.65 kJ
- B. - 28.65KJ
- C. + 57.3KJ
- D. - 114.6 KJ
- E. - 229.2 KJ
For the reaction 2Fe3+ 2I– \(\to\) 2Fe2+ + I2, which of the following statements is TRUE?
- A. Fe is oxidized to Fe3+
- B. Fe3+ is oxidized to Fe2+
- C. I- is oxidized to I2
- D. I- is reduced to I2
- E. I- is displacing an electron from Fe3+
In which of the following reactions does hydrogen peroxide act as a reducing agent?
- A. H2S + H2O2 \(\to\) S + 2H2O
- B. PbSO3 + H2O2 \(\to\) PbSO4 + H2O
- C. 2I+ 2H+ + H2O2 \(\to\) I2 + 2H2O
- D. PbO2 + 2HNO3 + H2O2 \(\to\) Pb(NO3)2 + 2H2O + O2
- E. SO2 + H2O2 \(\to\) H2SO4
Which of the following mixtures would result in a solution of pH greater than 7?
- A. 25.00 cm3 of 0.05 M H2SO4 and 25.00cm3 of 0.50 M Na2CO3
- B. 25.00 cm3 of 0.05 M H2SO4 and 25.00 cm3 of 0.10 M NaHCO3
- C. 25.00 cm3 of 0.11 MH2SO4 and 25.00cm3 0. 10 M NaOH
- D. 25.00cm3 of 0.11 MH2 SO4 and 50.00 cm3 of 0.05 M NaOH
- E. 25.00cm3 of 0.25 M H2SO4 and 50.00cm3 of 0.20 M NaOH
The balanced equation for the reaction of tetraoxosulphate(VI)acid with aluminium hydroxide to give water and aluminium tetraoxosulphate(VI) is
- A. H2SO4 + Al(OH)2 \(\to\) 2H2O + AlSO4
- B. 3H2SO4 + 2Al(OH)3 \(\to\) 6H2O + Al2(SO4)3
- C. 3H2SO4 + 2AlH \(\to\) 6H2O + Al(SO4)3
- D. 3H2 SO4 + 2Al(OH)3 \(\to\) Al(SO4)3
- E. H2SO4 + Al(OH)3 \(\to\) H2O + Al2(SO4)3
The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is
- A. 2:1
- B. 1:1
- C. 1:2
- D. 1:4
- E. 1:8
Naphthalene when heated melts at 354 K (81 oC). At this temperature the molecules of naphthalene
- A. decompose into smaller molecules
- B. change their shape
- C. are oxidized by atmospheric oxygen
- D. contract
- E. become mobile as the inter molecular forces are broken
Which among the elements 1. Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc, will NOT react with either water or steam?
- A. 1 and 2
- B. 2 and 3
- C. 3 and 4
- D. 1, 2, and 3
- E. 2, 3, and 5
A molar solution of caustic soda is prepared by dissolving
- A. 40 g NaOH in 100 g of water
- B. 40 g NaOH in 1000 g of water
- C. 20 g NaOH in 500 of solution
- D. 20 g NaOH in 1000 g of solution
- E. 2o g NaOH in 80 g of solution