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The periodic table is an arrangement of elements according to their
A solid substance with high melting and boiling points is likely to be
Which of the following metals reacts slowly with cold water?
Which of the following elements has the highest ionization energy?
The bleaching action of chlorine is through the process of
If 6.5 g of magnesium ribbon reacts completely with hydrochloric acid, how many grams of hydrogen gas would be liberated?
Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)
H = 1.0, Mg = 24.0
Calcium and magnesium belong to the same group of the periodic table because both
Which of the following substances is non-polar?
Which of the following pairs of compounds have the same molecular mass? [H=1.0, C=12.0, O=16.0]
When an equilibrium is established between dissolved and undissolved solutes, the solution is said to be
How many moles of carbon (IV) oxide contain 16.0g of oxygen? [C = 12.0, O = 16.0]
Stoichiometry is based on the law of
What is the percentage by mass of hydrogen in CH₃COOH? [CH₃COOH = 60]
Which of the following compounds has coordinate bonds in its structure?
The name of the compound CH₃C(CH₃)₂CH₂CH₂CH₃ is
The properties of a good primary standard include the following except
What is the solubility of a salt X at 25°C if the saturated solution of the salt contains 0.28g in 100cm³ of solution? [X = 56.0g]
Vinegar is an aqueous solution of
Which of the following solution containing one mole per dm³ have the lowest pH?
A sample of air was bubbled into water. The pH of the water slowly changed from 7 to 6. Which of the following gases in the sample caused the change?
The most suitable indicator for the reaction between NaOH(aq) and HCOOH(aq) is
Consider the following reaction equation:
2Al(OH)₃ + 3H₂SO₄ → Al₂(SO₄)₃ + 6H₂O
How many moles of tetraoxosulphate (VI) acid is needed to produce 0.5 mol of aluminum tetraoxosulphate (VI)?
Which of the following pairs of substances has the highest heat of neutralization?
When quick lime dissolves in water,
If the value of ΔH is positive for a reaction, it means that the reaction is
Which of the following compounds is formed by the oxidation of ethanol?
What is the characteristic of the gas liberated when dilute hydrochloric acid is added to iron (II) sulphide?
An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. What is the empirical formula of the compound? [H=1.0, C=12.0, O=16.0]
When excess chlorine is mixed with ethene at room temperature, the product formed is
Which of the following reagents could be used to distinguish between propan-1-ol and propan-2-ol?
If a catalyst is added to a system at equilibrium and the temperature and pressure remain constant, there would be no effect on the
Consider the following reaction equation:
3Cl₂ + 2NH₃ → N₂ + 6HCl
NH₃ is acting as ______.
The oxidation number of chromium in Cr₂O₇²⁻ is
The process by which alkanoic acid reacts reversibly with alkanols is known as
If the oxidation potential of Mg andAl are +2.37volts and +1.66volts respectively, then Mg would
Consider the reaction represented by the following equation: A decrease in pressure of the reaction would
In a mixture of gases which do not react chemically together, the pressure of the individual gas is
Biotechnology is applied in the
Which of the following organic compounds has the lowest boiling point?
Consider the reaction represented by the following equation:
C₂H₂ +H₂ → X +H₂ → Y
X and Y respectively are
Which of the following substances can be classified as heavy chemical?
In Boyle's law,
Which of the following apparatus is not used in volumetric analysis?
One of the deductions from Rutherford's alpha particle scattering experiment is that
The atoms ⁶⁵₂₉Cu and ⁶⁵₃₀Zn have the same number of neutrons.
The number of electrons in the 3d orbital of ₂₄Cr is
The method used to collect a gas in the laboratory depends on it I. boiling point II. Density III. Smell IV. Solubility in water.
Which of the following methods is not used for the separation of mixtures?
The group to which elements belong in the periodic table is determined by the number of
Kipps apparatus can be used to prepare
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