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Consider the following ionic equation:
Cr\(_2\)O\(_7\)\(^{2-}\) + 14H\(^+\) + ne- → 2Cr\(^{3+}\) + 7H\(_2\)O.
The value of n in the equation is_______?
A7
B6
C3
D2
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Question 232
waec2016
The oxidation number of sulphur is +4 in
ANa2S>2O3
BH2SO3
CH2SO4
DSO3
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Question 233
waec2016
Which of the following substances is a non-electrolyte?
AH2SO4
BCH3COOH
CC6H12O6
DNH4Cl
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Question 234
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Chlorine water is used as a bleaching agent because it is
AAn acidic solution
BAn alkaline solution
CAn oxidizing agent
DA reducing agent
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Question 235
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The quality of electricity required to discharge 1 mole of univalent ion is
A9600C
B48250C
C96500C
D193000C
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Question 236
waec2016
A compound with molecular formula CH2O2 is
AA Carbohydrate
BA Carboxylic acid
CAn alkanol
DAn ester
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Question 237
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Which of the following bonds are broken when ethanol is boiled?
I. Covalent bonds
II. Ionic bonds
III. Hydrogen bonds
AI only
BII only
CIII only
DI, II, III
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Question 238
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Which of the following salts when dissolved in water will form a solution that will change blue litmus to red?
ACH3COONa
BNH4Cl
CNaCl
DKCl
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Question 239
waec2016
On evaporation to dryness, 350cm\(^3\) of saturated solution of salt Z gave 55.5g of salt. What is the solubility of the salt? [Z = 101]
A1.57 moldm-3
B3.14 moldm-3
C6.28 moldm-3
D12.56 moldm-3
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Question 240
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Which of the following factors will affect the rate of the reaction represented by the following equation?
2HCl(aq) + CaCO3(s) \(\rightarrow\) CaCl2(aq) + H2O(1) + CO2(g)
I. Pressure
II.Concentration
III. Nature of reactants
IV. Temperature
AI and II only
BII, III and IV only
CI, II and III only
DI, II. III and IV
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Question 241
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Chemical equilibrium is attained when
AAll the reactants have been completely used up
BThe reaction goes to completion
CThe concentration of reactants and products remain constant
DThe concentration of reactants and products are equal
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Question 242
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The refreshing characteristic taste of fizzy drinks is due ot the presence of
ACarbon(IV)oxide
BGlucose
CHydrogen
DSodium Citrate
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Question 243
waec2016
Consider the following reaction equation
H3O+(aq) + OH(aq) \(\rightarrow\) 2H2O(1)
The reaction represents
AEsterification
BHydrolysis
CNeutralization
DRedox
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Question 244
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The pH of four solutions M,N,Q and R are 2,6,8 and 11 respectively.
Which of the following deductions about the solutions is correct?
AThe pH of N is increased when the solution is diluted
BThe pH of Q is increased when the solution is evaporated
CM is the most alkaline solution
DR is the most acidic solution
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Question 245
waec2016
When NH4Cl(s) is dissolved in water, the container feels cold to touch. This implies
AThe process is endothermic
BThe process is exothermic
CNH4Cl forms a saturated solution
DNH4Cl is highly soluble in water
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Question 246
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An aqueous solution of (NH4)2 SO4 is
AAcidic
BAlkaline
CAmphoteric
DNeutral
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Question 247
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The energy which accompanies the addition of an electron to an isolated gaseous atom is
AAtomization
BElectronegativity
CElectron affinity
DIonization
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Question 248
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Propane carbon(IV)oxide diffuse at the same rate because [H = 1.00, C = 12.0, O = 16.0]
AThey are both gases
BTheir molecules contain carbon
CThey have the same relative molecular mass
DBoth are denser than air
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Question 249
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The spreading of the scent of a flower in a garden is an example of_____?
ABrownian motion
BDiffusion
COsmosis
DTynadal effect
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Question 250
waec2016
The general gas equation \(\frac{PV}{T}\) = K is a combination of
