Question 1 of 20 1,623 total questions
Which of the following decreases when a given mass of gas is compressed to half its initial volume?
A Average intermolecular distance
B Frequency of collisions
C Number of molecules present
D Atomic radius of each particle
If a metal R forms a compound with the formula R(NO3 )2 , the formula of its tetraoxosulphate (IV) is
A R(SO4 )2
B RSO4
C R2 SO4
D R2 (SO4 )3
An element Y has the electronic configuration 1s2 2s2 2p6 62 3p4 . To what period does it belong in the periodic table?
The conclusion from Rutherford's alpha-scattering experiment is that
A atoms are mostly empty space with a small nucleus
B emissions from radioactive substances consist of three main components
C there is nuclear pull on orbital electrons
D electrons are deflected by both magnetic and electric fields
Which of the following elements has a ground state electronic configuration with an incomplete penultimate shell?
A Iron
B Sodium
C Aluminium
D Calcium
A hydrogen atom which has lost an electron contains
A one proton only
B one neutron only
C one proton and one neutron
D one proton, one electronic and one neutron
The atomic number of chlorine is 17. What is the number of electrons in a chloride ion?
The atom of an element X is represented as \(^y_z X\). The basic chemical properties of X depend on the value of
If the relative molecular mass of an element is not a whole number, it can be deduced that the element is
A naturally radioactive
B abundant in nature
C a transition metal
D an isotopic mixture
Which of the following statements about soapless detergents is correct? They
A lather readily with hard water
B increase the surface tension of water
C cause hydrolysis of salts in water
D from a curdy precipitate with soft water
The following compounds are hydrocarbons except
A methylpropanoate
B 2-methylbutane
C benzene
D cyclohexane
When alkynes are hydrogenated completely, they produce compounds with the general molecular formula
A C n H n
B C n H 2n+2
C Cn H 2n
D Cn H2n-2
Which of the following compounds can be represented by the molecular formula C2 H6 O?
A Propanel
B Ethanol
C Methanoic acid
D Glucose
Which of the following processes takes place during the production of margarine from vegetable oils?
A Esterification
B Hydrolysis
C Hydrogenation
D Saponification
When concentrated sodium chloride solution is electrolysed using inert electrodes the products are?
A oxygen and hydrogen
B hydrogen and oxygen
C sodium and oxygen
D soduim hydroxide, hydrogen and chlorine
If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is the one that has the
A smaller mass
B lower electrical charge
C greater stability in solution
D stronger tendency to accept electrons
Which of the following ions require the largest quantity of electricity for discharge at an electrode?
A 2.0 mole of Q 3+
B 2.5 mole of R2+
C 4.0 mole of Y-
D 3.0 mole of T-
Consider the following equation; Cr2 O7(aq) 2- + 14H+ (aq) + 6e- → 2Cr3+ (aq) + 7H2 O(I) . The oxidation number of chromium changes from
A -2 to + 3
B - 2 to + 6
C + 6 to + 3
D + 7 to + 6
The atomic number of chlorine is 17. What is the number of electrons in a chloride ion?
If the relative molecular mass of an element is not a whole number, it can be deduced that the element is
A naturally radioactive
B abundant in nature
C a transition metal
D an isotopic mixture
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