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Group 1 A metals are not found free in nature because they?
Aare of low melting and boiling points
Bhave weak metallic bonding
Cconduct electricity and heat
Dare very reactive
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Question 1612
jamb1995
Which of the following compounds will impart a brick-red colour to a non-luminious bunsen flame?
ANaCl
BLiCl
CCaCl2
DMgCl2
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Question 1613
jamb1995
In the extraction of iron in the blast furnace, limestone is used to?
Arelease CO2 for the reaction
Breduce the iron ore
Cincrease the strenght of the iron
Dremove impurities
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Question 1614
jamb1995
Which of the following ions will give a white precipitate with aqueous NaOH and soluble in excess of the base?
ACa2+
BMg2+
CZn2+
DCu2+
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Question 1615
jamb1995
A gas that will turn orange potassium heptaoxodichromate (lV) solution to clear green is?
Asulphur (lV) oxide
Bhydrogen sulphide
Csulphide (lV) oxide
Dhydrogen chloride
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Question 1616
jamb1995
Sulphur exists in six forms in the solid state. This property is known as?
Aisomerism
Ballotropy
Cisotopy
Disomorphism
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Question 1617
jamb1995
In the industrial production of hydrogen from natural gas, carbon (IV) oxide produced along with the hydrogen is removed by?
Awashing with water under pressure
Bpassing the mixture into lime water
Cusing ammoniacal copper (l) chloride
Ddrying over phoshorus (V) oxide
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Question 1618
jamb1995
Which of the following equilibria is shifted to the right as a result of an increase in pressure?
AH2(g) + I2(g) 2HI(g)
B2NO2(g) N2O4(g)
CPCl5(s) PCl3(s) + Cl2(g)
D2O3(g) 3O2(g)
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Question 1619
jamb1995
Which of the following processes leads to increase in entropy?
AMixing a sample of NaCl and sand
BCondensation of water vapour
CBoiling a sample of water
DCooling a saturated solution
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Question 1620
jamb1995
If an equilibrium reaction has ∆H < O, the reaction will proceed favorably in the forward reaction at?
Alow temperatures
Bhigh temperatures
Call temperatures
Dall pressures
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Question 1621
jamb1995
Cr\(_2\)O\(_7\)\(^{2-}\)(aq) + 14H\(^+\)(aq) + 6l\(^-\)(aq) → 2Cr\(^{3+}\)(aq) + 3l(g) + 7H\(_2\)O(I).
The change in the oxidation number of oxygen in the equation above is?
A0
B1
C2
D7
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Question 1622
jamb1995
Which of the following is a redox reaction?
AKCI(aq) + H2SO4(aq) → KHSO4(aq) + HCI(aq)
B2FeBr2(aq) + Br4(aq) → 2FeBr3(aq)
C3AgNO(aq) + FeCl3(aq) → 3AgCl(aq) + Fe(NO3)3(aq)
DH2CO3(aq) → H2O(I)2- + CO2(g)
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Question 1623
jamb1995
2CL-(aq) → CI2(g) + 2e-(aq). The above half-cell reaction occuring at the anode during the electrolysis of dilute ZnCI2 solution is?
Aionization
Boxidation
Creduction
Drecombination
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Question 1624
jamb1995
How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulpohate (IV)?
(F = 96 500 C mol-)
A0.5
B1.0
C1.5
D3.0
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Question 1625
jamb1995
In the process of silver-plating a metal M, the metal M is the?
Aanode and a direct current is used
Bcathode and an alternating current is used
Canode and an alternating current is used
Dcathode and a direct current is used
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Question 1626
jamb1995
Neutralization involves a reaction between H3O+ and?
ACI-
BOH-
CNO3-
DCO32-
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Question 1627
jamb1995
In general, an increase in temperature increases the solubility of a solute in water because?
Amore solute molecules collide with each other
Bmost solutes dissolve with the evoltion of heat
Cmore solute molecules dissociate at hihger temperatures
Dmost solutes dissolve with absorption of heat
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Question 1628
jamb1995
The difference between colloides and and suspensions is brought out clearly by the fact that while colloids?
Ado not scatter light, suspensions do
Bcan be separated by filtration, suspension cannot be so separated
Ccan be separated by a membrane, suspensions cannot
Ddo not settle out on standing, suspensions do
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Question 1629
jamb1995
When plastics and packaging materials made from chloroethene are burnt in the open, the mixture of gases released into the atmosphere is most likely to contain?
