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The sub-atomic particles located in the nucleus of an atom are?
- A. neutron and proton
- B. proton and electron
- C. proton and ions
- D. neutron and electron
Correct Answer: Option A
The IUPAC nomenclature of the structure is?
- A. 3-chloro-3-methylbutane
- B. 2,2,-dichloro-3-methylbutane
- C. 3-methylchlorobutane
- D. 2-chloro-2-methylbutane
Correct Answer: Option D
Explanation
Straight-chain hydrocarbon molecules that contain only singly-bonded carbons are called alkanes.
When naming these molecules, the final syllable in their name is “ane.”
- Find and name the longest continuous carbon chain.
- Identify and name groups attached to this chain.
- Number the chain consecutively, starting at the end nearest a substituent group.
- Designate the location of each substituent group by an appropriate number and name.
SO22 + O22 → 2SO33
In the reaction above, the most suitable catalyst is?
- A. chromium(vi)oxide
- B. iron(iii)oxide
- C. copper(i)oxide
- D. vanadium(v)oxide
Correct Answer: Option D
Explanation
During the Contact Process for manufacturing sulfuric acid, sulfur dioxide has to be converted into sulfur trioxide, which is done by passing sulfur dioxide and oxygen over a solid vanadium(V) oxide catalyst.
In the preparation of salts, the method employed will depend on the?
- A. composition
- B. dissociating ability
- C. stability to heat
- D. precipitating ability
Correct Answer: Option C
Explanation
The method used to prepare a salt depend on:
the solubility of the salt in water.
the heat stability of the salt
The following non-metal form acidic oxides with oxygen except?
- A. phosphorus
- B. sulphur
- C. carbon
- D. chlorine
Correct Answer: Option C
Explanation
The oxides which neither react with acids nor react with bases are known as neutral oxides.
Carbon monoxide neither reacts with acids nor reacts with bases.
Thus, carbon monoxide is a neutral oxide, produced when combustion reactions are not fully completed, either through lack of oxygen or due to low mixing
How many neutrons are present in atom with mass number and atomic number 37 and 17 respectively?
- A. 18
- B. 20
- C. 37
- D. 17
Correct Answer: Option B
Explanation
The mass number = number of neutrons + atomic number.
number of neutrons = The mass number – atomic number.
number of neutrons = 37 – 17 = 20
The sulphide that is commonly used in coating electric fluorescent tubes is?
- A. iron(ii)Sulphide
- B. tin(ii)sulphide
- C. Zinc Sulphide
- D. lead(iv) Sulphide
Correct Answer: Option C
Explanation
ZnS (Zinc Sulfide) screen was used because it emits a flash of light when struck by an alpha particle.
This is a phenomenon called Radio luminescence in which a flash of light is observed on the screen when acted upon by a radioactive substance.
An organic compound which liberate carbon(iv)oxide from trioxocarbonate(iv) solution is likely to be?
- A. C22H55OH
- B. C33H44
- C. C66H66
- D. CH33COOH
Correct Answer: Option D
Explanation
Carboxylic acids and enols react with sodium bicarbonate to liberate carbon dioxide.
E,g CH33COOH
Addition of sodium chloride to water to form a solution would lead to?
- A. increase in freezing point and increase the boiling point
- B. increase in freezing point and decrease the boiling point
- C. decrease in freezing point and decrease the boiling point
- D. decrease in freezing point and increase the boiling point
Correct Answer: Option D
Explanation
If you add salt to water, you lower its freezing point as well as raise its boiling point.
A chemical widely used as a fertilizer is?
- A. galena
- B. bauxite
- C. emerald
- D. nitrochalk
Correct Answer: Option B
On the basis of the electrochemical series, which of these ions will show the greater tendency to be discharged at the cathode in an electrolytic cell
- A. cu2+2+
- B. sn2+2+
- C. fe2+2+
- D. zn2+2+
Correct Answer: Option A
Explanation
The arrangement of elements in order of increasing electrode potential values is called electrochemical series.
K > Na > Ca > Mg > Al > Zn > Fe > Ni > Sn > Pb > H > Cu > Ag > Au.
Addition of charcoal to the filter bed of sand during water treatment for township supply is to?
- A. prevent goiter
- B. prevent tooth decay
- C. remove odour
- D. kill germs
Correct Answer: Option C
Explanation
Activated Carbon filters are excellent at removing chlorine and related poor taste and odor.
Using the metal activity series, the metal that can liberate hydrogen gas from steam is?
- A. iron
- B. copper
- C. tin
- D. lead
Correct Answer: Option A
Explanation
Iron reacts with steam to form iron oxide and hydrogen gas.
An organic compound with fishy smell is likely to have a general formula?
- A. RCONHR11
- A. RCONH22
- C. RNH22
- D. RCOR11
Correct Answer: Option C
Explanation
Amines possess a characteristic ammonia smell, liquid amines have a distinctive “fishy” and foul smell.
-Amine. R-NH2
N22O44 ⇔ 2NO22 (Δ = -ve)
From the reaction above, which of these conditions would produce the highest equilibrium yield for N22O44?
- A. Low temperature and high pressure
- B. Low temperature and low pressure
- C. high temperature and low pressure
- D. high temperature and high pressure
Correct Answer: Option A
Explanation
Low temperature and high pressure favor the highest yield for N22O4
Zn + 2HCL → ZnCl22 + H22
- A. oxidized
- B. a reactant
- C. reduced
- D. a metal
Correct Answer: Option A
Explanation
-Zn is a reducing agent, HCl is an oxidizing agent.
-the zinc is oxidized
An organic functional group which can likely decolorize ammoniacal silver nitrate is?
- A. alkene
- B. alkane
- C. alkyne
- D. alkanol
Correct Answer: Option C
Explanation
Terminal alkynes react with Tollens reagent (ammoniacal silver nitrate solution) to form silver alkynides as a white precipitate, whereas internal alkynes do not react with Tollens reagent.
A colored gas that is known to be poisonous and can readily damage the mucous lining of the lungs is?
- A. hydrogen sulphide
- B. carbon(ii)oxide
- C. chlorine
- D. sulphur(iv)oxide
Correct Answer: Option B
Explanation
When too much carbon monoxide is in the air you’re breathing, your body replaces the oxygen in your red blood cells with carbon monoxide.
In order to electroplate spoon with silver, the arrangement of the electrolytic cell is?
- A. the anode is a silver rod and the cathode is the spoon
- B. the anode is the spoon and the cathode is a silver rod
- C. the electrolyte is silver trioxonitrate(v)( solution and the cathode is a silver rod.
- D. the electrolyte is silver trioxonitrate(v) solution and the anode is the spoon
Correct Answer: Option A
Explanation
The steel spoon to be coated with silver is the cathode of the electrolytic cell and the anode of the electrolytic cell is made of a silver metal
An organic compound which decolorizes bromine water is likely to be?
- A. C33H88
- B. C22H66
- C. C44H1010
- D. C22H44
Correct Answer: Option D
Explanation
If you shake an alkene with bromine water (or bubble a gaseous alkene through bromine water), the solution becomes colourless.
Alkenes decolourise bromine water.
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. C44H1212O
- B. C33H99O
- C. C44H99O
- D. C33H88O
Correct Answer: Option D
Explanation
C 69126912 H 15.3115.31 O 30.71630.716
C = 5.75, H = 15.3, O = 1.92
C 5.751,925.751,92 H 15.31.9215.31.92 O 1.921.921.921.92
C33H88O
2H22 + O22 → 2H22O
From the equation above, calculate the volume of unreacted oxygen gas if a mixture of 50cm33 of hydroden and 75cm33 of oxygen are involved
- A. 85cm33
- B. 50cm33
- C. 125cm33
- D. 55cm33
Correct Answer: Option B
Explanation
Since 2 mol H22 reacted with 1 mol of O22
: 50cm33 of hydrogen reacted with 25cm33 of oxygen
Remainder oxygen = Supplied amount – Reacted amount → 75cm33 – 25cm33
= 50cm3
In which of the following will hydrogen form ionic compound?
- A. HCL
- B. NaH
- C. NH33
- D. CH44
Correct Answer: Option B
Explanation
NaH is a saline (salt-like) hydride, composed of Na+ and H− ions
If the volume of a given mass of a gas at 0ºc in 29.5cm33 what will be the volume of the gas at 15ºc, the pressure remaining constant
- A. 31.6
- B. 62.2
- C. 32.7
- D. 31.1
Correct Answer: Option D
Explanation
Charles’ law is a special case of the ideal gas law in which the pressure of a gas is constant.
Charles’s law defines the direct relationship between temperature and volume.
GIVEN DATA: V11 = 29.5cm33, V22 = ? , T11 = 0ºc or 273k, T22 = 15ºc or 288k
V1T1V1T1 = V2T2V2T2
V22 = V1xT2T1V1xT2T1 → 29.5×28827329.5×288273
V22 = 31.1cm3
The reactions below represent neutralization reaction, in which of them is the value of ΔH highest?
- A. CH33CH22COOH + KOH → CH33CH22COOK + H22O
- B. NH44OH + HCL → NH44 + H22O
- C. NaOH + HCL → NaCL + H22O
- D. CH33COOH + NaOH → CH33COONa + H22O
Correct Answer: Option C
Explanation
The enthalpy change of neutralisation involving weak acids are smaller in magnitude compared to that between strong acids and strong bases. This is because weak acids/bases are partially dissociated, which means not all hydrogen ions are free to react with hydroxide ions.
For strong acids and bases, the enthalpy of neutralisation values are always closely similar with the values -57 and -58 KJ/mol. We know that strong acids completely ionize in water. In case of weak acids, only partial dissociation of its ions occurs.
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
Correct Answer: Option B
Explanation
The most common source of carbon monoxide is the partial combustion of carbon-containing compounds
The dehydration of CH33CH22CH22CH22OH will give?
- A. HC≡CCH22CH33
- B. CH22≡CH22CH33
- C. CH33C≡CCH33
- D. CH33CH≡CHCH33
Correct Answer: Option D
Explanation
An alkene is produced when dehydration of alcohol is performed. Alcohol dehydration is an example of an elimination reaction which is quite the opposite of substitution reaction and addition reaction.
The products of the dehydration of a primary alkanol are water and an alk-1-ene (1-alkene).
Butanol gives a mixture of but-1-ene and but-2-ene when dehydrated.
Calculate the value of ΔS if the heat change in the in system is 400j at -273ºC
- A. 40J/K
- B. 400J/K
- C. 4J/K
- D. 0.4J/K
Correct Answer: Option B
Which of the following best represent solid gas mixture?
- A. milk
- B. kerosene
- C. soil
- D. smoke
Correct Answer: Option D
Explanation
Solid in gas mixture: Smoke, ice clouds, dust.
Liquid in gas mixture: fog, mist, vapour and hair sprays.
Gas in solid mixture: aerogel, Styrofoam.
H++ + OH−− → H22O
The equation above illustrates
- A. precipitation
- B. hydration
- C. hydrolysis
- D. neutralization
Correct Answer: Option D
Explanation
A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water.
Electrons enter into orbitals in order of increasing energy as exemplified by?
- A. 1S222S222PX222py222pz003s00
- B. 1S222S222PX222py112pz113s00
- C. 1S222S222PX112py112pz113s11
- D. 1S222S222PX222py222pz003s11
Correct Answer: Option C
Explanation
Shells and subshells are filled in energy level order, so electrons will fill the 4s subshell before the 3d shell.
And the x subshell before the y and z.
Wrought iron is obtained by heating cast iron in a furnace with?
- A. magnetite
- B. haematite
- C. carbon(ii)oxide
- D. calcium trioxosilicate(iv)
Correct Answer: Option B
Explanation
Cast iron + haematite = wrought iron
In the extraction of iron, hot air is introduced into the blast furnace through?
- A. valves
- B. open-hearths
- C. arcs
- D. tuyeres
Correct Answer: Option D
Explanation
Pre-heated air at about 600ºC is blown into the furnaces from the bottom through the tuyeres.
How many bonding pair are present in carbon(iv)oxide?
- A. 4
- B. 3
- C. 2
- D. 1
Correct Answer: Option C
Explanation
There are 2 bond pairs in CO₂ and no lone pairs are there.
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
Correct Answer: Option D
Explanation
Isomers of Butene: are But-1-ene, But-2-ene, 2-Methylpropene or 2-methylprop-1-ene
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
Correct Answer: Option C
Explanation
Alkanes are very useful as fuels.
What volume of (dm33) of water will be added to 10dm33 of 2.0dm33 HCL acid solution to give a final solution of 0.5dm33?
- A. 30
- B. 40
- C. 20
- D. 50
Correct Answer: Option B
Explanation
To make a fixed amount of a dilute solution from a stock solution,
use the formula: C1V1 = C2V2
where: V1 = Volume of stock solution needed to make the new solution.
C1 = Concentration of stock solution.
V2 = Final volume of new solution.
C2 = Final concentration of stock solution
2 * 10 = 0.5 * V2
20 = 0.5V2
200.5200.5 = V2
= 40dm3
| GAS | CO22 | N22 | 22 |
| % BY VOLUME | 4 | 72 | 24 |
The above table shows the compositions of the atmosphere of planet of X. Which of these gases are present in higher percentages on earth?
- A. CO22 and O22
- B. N22 and CO22
- C. CO22, O22 and N22
- D. O22 and N22
Correct Answer: Option A
Explanation
The air in Earth’s atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of other gases, too, such as carbon dioxide, neon, and hydrogen.
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