Hard water is water with high concentrations of dissolved ions, in particular calcium and
- A. magnesium ions
- B. nitrogen ions
- C. phosporus ions
- D. helium ions
| GAS | CO\(_2\) | N\(_2\) |
O\(_2\) |
| % BY VOLUME | 4 | 72 | 24 |
The above table shows the compositions of the atmosphere of planet X. Which of these gases are present in higher percentages on earth?
- A. CO\(_2\) and O\(_2\)
- B. N\(_2\) and CO\(_2\)
- C. CO\(_2\), O\(_2\) and N\(_2\)
- D. O\(_2\) and N\(_2\)
What volume of (dm\(^3\)) of water will be added to 10dm\(^3\) of 2.0 mol/dm\(^3\) HCL acid solution to give a final solution of 0.5 mol/dm\(^3\)?
- A. 30
- B. 40
- C. 20
- D. 50
Alkanes are used mainly?
- A. in the textile industry
- B. in the hydrogenation of oils
- C. as domestic and industrial fuels
- D. as fine chemicals
2-methylprop-1-ene is a structural isomer of?
- A. But-1-yne
- B. 2-methyl But-1-ene
- C. 3-methyl prop-1-yne
- D. But-2-ene
How many bonding pair are present in carbon(iv)oxide?
- A. 4
- B. 3
- C. 2
- D. 1
In the extraction of iron, hot air is introduced into the blast furnace through?
- A. valves
- B. open-hearths
- C. arcs
- D. tuyeres
Wrought iron is obtained by heating cast iron in a furnace with?
- A. magnetite
- B. haematite
- C. carbon(ii)oxide
- D. calcium trioxosilicate(iv)
Electrons enter into orbitals in order of increasing energy as exemplified by?
- A. 1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^2\)2pz\(^0\)3s\(^0\)
- B. 1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^1\)2pz\(^1\)3s\(^0\)
- C. 1S\(^2\)2S\(^2\)2PX\(^1\)2py\(^1\)2pz\(^1\)3s\(^1\)
- D. 1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^2\)2pz\(^0\)3s\(^1\)
H\(^+\) + OH\(^-\) → H\(_2\)O
The equation above illustrates
- A. precipitation
- B. hydration
- C. hydrolysis
- D. neutralization
Which of the following best represent solid gas mixture?
- A. milk
- B. kerosene
- C. soil
- D. smoke
When heat is absorbed during a chemical reaction, the reaction is said to be
- A. thermodynamic
- B. exothermic
- C. isothermal
- D. endothermic
The dehydration of CH\(_3\)CH\(_2\)CH\(_2\)CH\(_2\)OH will give?
- A. HC≡CCH\(_2\)CH\(_3\)
- B. CH\(_2\)≡CH\(_2\)CH\(_3\)
- C. CH\(_3\)C≡CCH\(_3\)
- D. CH\(_3\)CH=CHCH\(_3\)
The pollutant usually presents in a city which generates its electricity from coal?
- A. fog
- B. carbon(ii)oxide
- C. smog
- D. sulphur(iv)oxide
The reactions below represent neutralization reaction, in which of them is the value of ΔH highest?
- A. CH\(_3\)CH\(_2\)COOH + KOH → CH\(_3\)CH\(_2\)COOK + H\(_2\)O
- B. NH\(_4\)OH + HCL → NH\(_4\) + H\(_2\)O
- C. NaOH + HCL → NaCL + H\(_2\)O
- D. CH\(_3\)COOH + NaOH → CH\(_3\)COONa + H\(_2\)O
If the volume of a given mass of a gas at 0ºc is 29.5cm\(^3\). What will be the volume of the gas at 15ºc, given that the pressure remains constant.
- A. 31.6
- B. 62.2
- C. 32.7
- D. 31.1
In which of the following will hydrogen form ionic compound?
- A. HCL
- B. NaH
- C. NH\(_3\)
- D. CH\(_4\)
2H\(_2\) + O\(_2\) → 2H\(_2\)O
From the equation above, calculate the volume of unreacted oxygen gas if a mixture of 50cm\(^3\) of hydroden and 75cm\(^3\) of oxygen are involved
- A. 85cm\(^3\)
- B. 50cm\(^3\)
- C. 125cm\(^3\)
- D. 55cm\(^3\)
An organic compound contains 69% carbon, 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16]
- A. C\(_4\)H\(_12\)O
- B. C\(_3\)H\(_9\)O
- C. C\(_4\)H\(_9\)O
- D. C\(_3\)H\(_8\)O
Crude petroleum is converted to useful products by the process of?
- A. fractional crystallization
- B. fractional distillation
- C. filtration
- D. chromatography
An organic compound which decolorizes bromine water is likely to be?
- A. C\(_3\)H\(_8\)
- B. C\(_2\)H\(_6\)
- C. C\(_4\)H\(_10\)
- D. C\(_2\)H\(_4\)