The electronic configuration of an element is 1S2 2S2 2P6 3S2 3P3. How many unpaired electrons are there in the element?
A
5
B
4
C
3
D
2
↪ Answer
2
Which of the following can be obtained by fractional distillation?
A
Nitrogen from liquid air
B
Sodium Chloride from sea water
C
Iodine from solution of Iodine in carbon tetrachloride
D
Sulphur from the solution of sulphur in carbon disulphide
↪ Answer
3
Duralumin consists of aluminum, copper?
A
Zinc and Gold
B
Lead and Manganese
C
Nickel and Silver
D
Manganese and Magnesium
↪ Answer
4
An example of a polysaccharide is?
A
Dextrose
B
Mannose
C
Glucose
D
Starch
↪ Answer
5
8g of CH4 occupies 11.2 at S.T.P. What volume would 22g of CH3CH2CH3 occupy under the same condition?
A
3.7dm3
B
11.2dm3
C
22.4dm3
D
33dm3
↪ Answer
6
The best treatment for a student who accidentally poured conc tetraoxosulphate(vi) on his skin in the laboratory is to wash his skin with?
A
with cool running water
B
sodium hydroxide solution
C
iodine solution
D
sodium trioxonitrate(v) solution
↪ Answer
7
Which of the gas laws does this graph illustrate?
A
Boyle
B
Charles
C
Gay-Lussac
D
Graham
↪ Answer
8
What are the possible oxidation numbers of an element if its atomic number is 17?
A
-1 and 7
B
-1 and 6
C
-3 and 5
D
-2 and 6
↪ Answer
9
What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?
A
Steam distillation
B
Destructive distillation
C
Liquefication
D
Hydrolysis
↪ Answer
10
Liquid black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the ?
A
Acid
B
Ester of alkanoic acid
C
Alkali
D
Alkanol
When water drops are added to calcium carbide in a container and the gas produced is passed through a jet and lighted, the resultant flame is called an?
A
Oxyethene
B
Oxyhydrocarbon flame
C
Oxyacetylene flame
D
Oxymethane flame
↪ Answer
12
Which of the following substances is a mixture?
A
Granulated sugar
B
Seawater
C
Sodium chloride
D
Iron filling
↪ Answer
13
If the quantity of oxygen occupying 2.76L container at a pressure of 0.825 atm and 300k is reduced by one-half, what is the pressure exerted by the remaining gas?
A
1.650atm
B
0.825atm
C
0.413atm
D
0.275atm
↪ Answer
14
Four elements P, Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively. Which of these elements is noble gas?
A
P
B
Q
C
R
D
S
↪ Answer
15
The products of the thermal decomposition of ammonium trioxonitrate(v) are?
A
Nitrogen (I) Oxide and Water
B
Ammonia and Oxide
C
Nitrogen and Water
D
Nitrogen (IV) Oxide and Water
↪ Answer
16
How many valence electrons are contained in the element 1531P?
A
3
B
4
C
15
D
31
↪ Answer
17
The number of molecules of Carbon(iv)Oxide produced when 10.0g of CaCO3 is treated with 0.2dm3 of 1 Mole of HCL in the equation
CaCO3 + 2HCL ⇒ CaCl2 + H2 O + CO2 , is ?
A
1.00 X 1023
B
6.02 X 1023
C
6.02 X 1022
D
6.02 X 1024
↪ Answer
18
The volume occupied by 1.58g of a gas at S.T.P is 500cm3. What is the relative molecular mass of the gas? [ G.M.V at S.T.P = 22.4dm23 ]
A
28
B
32
C
44
D
74
↪ Answer
19
Which of the following gases will rekindle a brightly splint?
A
- NO2
B
NO
C
N2O
D
CL2
↪ Answer
20
The shape of ammonia molecule is?
A
Trigonal planar
B
Octahedral
C
Square planar
D
Tetrahedral
A few drop of conc HCL are added to about 10cm3 of a solution of PH 3.4. The PH of the resulting mixture is?
A
less than 3.4
B
greater than 3.4
C
unaltered
D
the same as that of the pure water
↪ Answer
22
Chromatography is used to separate components of mixture which differ in their rates of ?
A
diffusion
B
migration
C
reaction
D
sedimentation
↪ Answer
23
Deliquescent substances are also?
A
efflorescent
B
anhydrous
C
hygroscopic
D
insoluble
↪ Answer
24
Helium is used in observation of ballons because it is?
A
Light and combustible
B
light and non-combustible
C
heavy and combustible
D
heavy and non-combustible
↪ Answer
25
32g of anhydrous copper(ii)tetraoxosulphate(vi) dissolved in 1dm3 of water generated 13.0kj of heat. The heat solution is?
A
26.0kj/mol
B
65.0kj/mol
C
130.0kj/mol
D
260.0kj/mol
↪ Answer
26
A gaseous metallic chloride MCl consists of 20.22% of M by mass. The formula of the chloride is?
[ M = 27, Cl = 35.5]
A
MCl
B
MCl2
C
MCl3
D
M2Cl6
↪ Answer
27
What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?
A
24,125 C
B
48,250 C
C
72,375 C
D
96,500 C
↪ Answer
28
Which of the following types of bonding does not involve the formation of new substances?
A
Metallic
B
Covalent
C
Co-ordinate
D
Electrovalent
↪ Answer
29
An organic compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine can be?
A
Alkene
B
Alkanal
C
Alkanone
D
Alkanoic Acid
↪ Answer
30
The substance often used for vulcanization of rubber is?
A
Chlorine
B
Hydrogen peroxide
C
Sulphur
D
Tetraoxosulphate(vi) acid
The chlorinated alkane often used industrially to remove grease is?
A
Tetrachloromethane
B
Chloromethane
C
Trichloromethane
D
Dichloromethane
↪ Answer
32
What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
A
8.0g
B
16.0g
C
36.0g
D
72.0g
↪ Answer
33
Proteins in acid solution undergo?
A
Substitution
B
Fermentation
C
Hydrolysis
D
Polymerisation
↪ Answer
34
The general formula for the Alkanals is?
A
R2CO
B
RCHO
C
ROH
D
RCOOR
↪ Answer
35
When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes?
A
Bipolar
B
Negatively charged
C
Positively charged
D
Neutral
↪ Answer
36
When a solid substance disappears completely as a gas on heating, the substance is said to have undergone?
A
Sublimation
B
Crystallization
C
Distillation
D
Evaporation
↪ Answer
37
An electron can be added to a halogen atom to form a halide ion with?
A
8 valence electrons
B
7 valence electrons
C
2 valence electrons
D
3 valence electrons
↪ Answer
38
Aluminum hydroxide is used in the dyeing industry as a?
A
Dye
B
Dispersant
C
Salt
D
Mordant
↪ Answer
39
The most important element on the earth’s crust is?
A
Nitrogen
B
Hydrogen
C
Oxygen
D
Fluorine
↪ Answer
40
To obtain pure carbon(ii)oxide from its mixture with carbon(iv)oxide, the mixture should be?
A
Passed over heated copper(ii)oxide
B
Bubbled through water
C
Bubbled through conc H2SO4
D
Bubbled through conc NAOH
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