Question 1 of 20 4,306 total questions
A balanced chemical equation obeys the law of?
A conservation of mass
B difinite proportions
C multiple proportions
D conservation of energy
Which of the following substances is a mixture?
A Sulphur powder
B Bronze
C Distilled water
D Ethanol
Which of the following accounts for the difference in the mode of conduction of electricity by metals and aqueous salt solutions?
A Electrons are present in metals but not in salt solutions
B Metals are conductors while salts are electrolytes
C Electricity is carried by mobile elrctrons in metals but by ions is aqueous salt solution
D salts ionize in aqueous solutions while metals do not
E Metals are reducing agents while salts are not
A dye is suspected to have contaminated a lollipop. Which of the following is the best method by which the contaminant may be isolated?
A Fractional distillational
B Recrystallization
C Filtration
D Paper chromatography
E Evaporation
What is the value of n in the following equation? XO-4 +8H + + ne- → X2 + + 4H2 O
Which of the following groups contains entirely linear molecules?
A H 2 NH3 O 2
B CO2 NH 3 2
C H 2 CH4 N2
D CO2 H2 N2
E CH 4 O 2 CO 2
The product of the reaction between propanoic acid and ethanol is
A prophlmethanoate
B ethylethanoate
C methylpropanoate
D propylethanoate
E ethylpropanoate
Which of the following minerals contains flurine as one of its constituent elements?
A Cryolite
B Bauxite
C Potash alum
D Kaolin
E Mica
Which of the following pH values is likely to be that of a slightly alkaline solution?
Which of the following statements is not correct? The 4s orbital
A is defined by the quantum number 1 = O
B is of higher energy than the 3d orbital
C contains a maximum of two electrons
D is spherical about the nucleus
E is filled before the 4p orbital
Which of the following statement is not correct about esterification?
A It is a slow reaction
B the process is reversible
C it is similar to hydrolysis
D it is catalysed by acids
E the products usually have a fruity smell
If a reaction is said to be exothermic, which of the following statements is a correct deduction from the information?
A the reaction vessel gets hotter as the reaction proceeds
B ∆H for the reaction is positive
C the rate of the reaction increases with time
D the activation energy of the reaction is high
E the rate of the reaction increases with time
If a reaction is said to be exothermic, which of the following statements is a correct deduction from the information?
A the reaction vessel gets hotter as the reaction proceeds
B ∆H for the reaction is positive
C the rate of the reaction increases with time
D the activation energy of the reaction is high
E the rate of the reaction increases with time
Vulcanization of rubber
A stops the growth of fungus on the rubber
B increases the solubility of the rubber
C decreases the elasticity of the rubber
D hardnes the rubber through cross-linkage
E removes sulphur from the rubber
The energy required to remove the most loosely bound electron from an atom in the gaseous state is known as the
A bond energy
B ionization energy
C potential energy
D activation energy
E kinetic energy
Which of the following compounds is not correct about the reaction of sodium material for the manufacture of plastics?
A Ethyne
B Ethane
C Monochloroethene
D Propene
E Butadiene
What is the number of oxygen atoms in 32g of the gas? (O = 16, L = 6.0 X 10\(^{23}\) mol\(^{-1}\))
A 3.2 X 10 23
B 6.0 X 1023
C 1.2 X 1024
D 1.6 X 1024
E 2.0 X 1024
The formula (CH3 ),3 COH is that of a
A polyhdric alkanol
B secondary alkanol
C tertiary alkanol
D primary alkanol
E trihydric alkanol
Which of the following gases will have the highest rate of diffusion under the same conditions? (H = 1, C =12, O = 16, S = 32, CI = 35.5)
When sucrose is warmed with Fehling's solution
A a silver mirror is produced
B the solution turns milky
C a brick-red precipitate is formed
D there is no precipitate
E a blue coloration is produced
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