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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
Practice Olive.ng Jamb cbt online examination
Correct Answer: Option A
Explanation
The nucleus contains two types of subatomic particles, protons and neutrons.
The protons have a positive electrical charge and the neutrons have no electrical charge.
A third type of subatomic particle, electrons, move around the nucleus.
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
Practice Olive.ng Jamb cbt online examination
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.
SO2
+ O2
→ 2SO3
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
Practice Olive.ng Jamb cbt online examination
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
Practice Olive.ng Jamb cbt online examination
Practice Olive.ng Jamb cbt online examination
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
Practice Olive.ng Jamb cbt online examination
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
Practice Olive.ng Jamb cbt online examination
Practice Olive.ng Jamb cbt online examination
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
Practice Olive.ng Jamb cbt online examination
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. C2
H5
OH
B. C3
H4
C. C6
H6
D. CH3
COOH
Practice Olive.ng Jamb cbt online examination
Correct Answer: Option D
Explanation
Carboxylic acids and enols react with sodium bicarbonate to liberate carbon dioxide.
E,g CH3
COOH
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
Practice Olive.ng Jamb cbt online examination
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
Practice Olive.ng Jamb cbt online examination
Practice Olive.ng Jamb cbt online examination
Correct Answer: Option D
Explanation
Calcium ammonium nitrate or CAN, also known as nitro-limestone or nitrochalk, is a widely used inorganic fertilizer.
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+
B. sn2+
C. fe2+
D. zn2+
Practice Olive.ng Jamb cbt online examination
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
Practice Olive.ng Jamb cbt online examination
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
Practice Olive.ng Jamb cbt online examination
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. RCONHR1
A. RCONH2
C. RNH2
D. RCOR1
Practice Olive.ng Jamb cbt online examination
Practice Olive.ng Jamb cbt online examination
Correct Answer: Option C
Explanation
Amines possess a characteristic ammonia smell, liquid amines have a distinctive “fishy” and foul smell.
-Amine. R-NH2
N2
O4
⇔ 2NO2
(Δ = -ve)
From the reaction above, which of these conditions would produce the highest equilibrium yield for N2
O4
?
A. Low temperature and high pressure
B. Low temperature and low pressure
C. high temperature and low pressure
D. high temperature and high pressure
Practice Olive.ng Jamb cbt online examination
Correct Answer: Option A
Explanation
Low temperature and high pressure favor the highest yield for N2
O
Zn + 2HCL → ZnCl2
+ H2
What happens to zinc in the above reaction?
A. oxidized
B. a reactant
C. reduced
D. a metal
Practice Olive.ng Jamb cbt online examination
Practice Olive.ng Jamb cbt online examination
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
Practice Olive.ng Jamb cbt online examination
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
Practice Olive.ng Jamb cbt online examination
Correct Answer: Option C
Explanation
Chlorine is a yellow-green gas at room temperature. Chlorine has a pungent, irritating odor similar to bleach that is detectable at low concentrations.
Exposure to low concentrations of chlorine (1 to 10 ppm) may cause eye and nasal irritation, sore throat, and coughing. Inhalation of higher concentrations of chlorine gas (>15 ppm) can rapidly lead to respiratory distress with airway constriction and accumulation of fluid in the lungs (pulmonary edema).
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
Practice Olive.ng Jamb cbt online examination
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. C3
H8
B. C2
H6
C. C4
H10
D. C2
H4
Practice Olive.ng Jamb cbt online examination
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.
Crude petroleum is converted to useful products by the process of?
A. fractional crystallization
B. fractional distillation
C. filtration
D. chromatography
Practice Olive.ng Jamb cbt online examination
Practice Olive.ng Jamb cbt online examination
Correct Answer: Option B
Explanation
A process called fractional distillation is used in oil refineries to separate (as well as join or split) the various lengths of hydrocarbon chains to create different petroleum products from the different distillates.
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. C4
H12
O
B. C3
H9
O
C. C4
H9
O
D. C3
H8
O
Practice Olive.ng Jamb cbt online examination
Correct Answer: Option D
Explanation
C 6912
H 15.31
O 30.716
C = 5.75, H = 15.3, O = 1.92
C 5.751,92
H 15.31.92
O 1.921.92
C3
H8
O
2H2
+ O2
→ 2H2
O
From the equation above, calculate the volume of unreacted oxygen gas if a mixture of 50cm3
of hydroden and 75cm3
of oxygen are involved
- A. 85cm3
- B. 50cm3
- C. 125cm3
- D. 55cm3
- Practice Olive.ng Jamb cbt online examination
- Correct Answer: Option B
- Explanation
- Since 2 mol H2
- reacted with 1 mol of O2
- 50cm3
of hydrogen reacted with 25cm3
of oxygen
Remainder oxygen = Supplied amount – Reacted amount → 75cm3
– 25cm3
= 50cm3
In which of the following will hydrogen form ionic compound?
A. HCL
B. NaH
C. NH3
D. CH4
Practice Olive.ng Jamb cbt online examination
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 is 29.5cm3
. 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
Practice Olive.ng Jamb cbt online examination
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: V1
= 29.5cm3
, V2
= ? , T1
= 0ºc or 273k, T2
= 15ºc or 288k
V1T1
= V2T2
V2
= V1xT2T1
→ 29.5×288273
V2
= 31.1cm3
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