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Question 1 of 40
Which of the following separation techniques is extensively employed in the garri processing industry?
Question 2 of 40
The presence of common salt as an impurity in water will cause the boiling of water to ________.
Question 3 of 40
The electronic configuration of an element E is 1s2 2s2 2p6 32 4s1 . The element E _______
Question 4 of 40
A salt which loses mass when exposed to air is
Question 5 of 40
A sample of permanently hard water contains ___________.
Question 6 of 40
On exposure to the atmosphere, NaOH pellets absorb moisture and dissolve in it to form a solution. The phenomenon is known as _______.
Question 7 of 40
The basicities of CH3 COOH and H2 SO4 acids, respectively, are ___________.
Question 8 of 40
Which of the following salts will dissolve in water to give a solution with a pH less than 7?
Question 9 of 40
When an element can exist in two or more forms in the same physical state, the element is said to exhibit
Question 10 of 40
Determine the number of unpaired electrons in the p-orbital of an O2 atom.
Question 11 of 40
The bond type formed between two elements with electronic configurations:
1S2 2S2 2P6 3S1
and
1S2 2S2 2P5 is _______
Question 12 of 40
Two elements, X and Y , have the same electronic configurations:
1S2 2S2 2P6 3S2
1S2 2S2 2P4
respectively.
The chemical formula of the compound formed by X and Y is ________
Question 13 of 40
Which of the following pollutants is biodegradable?
Question 14 of 40
Which of the following is not correct of glucose and fructose? They
Question 15 of 40
Which of the following statements is not correct?
Group 7 elements __________.
Question 16 of 40
Which of the following is suitable for determining different isotopes present in an element which exhibits isotropy?
Question 17 of 40
The hydrogen isotope, deuterium which has lost one electron, now contains
Question 18 of 40
The electronic configuration of fluoride ion, F-1 , is
Question 19 of 40
Elements of group 1, in the periodic table, are ____________
Question 20 of 40
I. The constituents vary in compositionII. The constituents can be separated by physical methodsIII. It contains unreactive rare gases.
Which one of the following combinations entirely consists of reasons why air is classified as a mixture?
Question 21 of 40
In the treatment of water for town supply, chlorine is usually used to ___________.
Question 22 of 40
How many hydrogen ions (H+ ) are contained in 100 cm3 of 0.40 mol dm-3 H2 SO4 acid?
\( \left [\scriptsize N_A = 6.02 \: \times \: 10^{23}\right] \)
Question 23 of 40
Which of the following gases is the most suitable for performing the fountain experiment?
Question 24 of 40
Moist chlorine bleaches by _________.
Question 25 of 40
In an acid-base titration experiment, 23.40 cm3 of 0.106 mol dm-3 HNO3 acid completely neutralised 20.00 cm3 of Ca(OH). Calculate the molar concentration of the basic solution.
Question 26 of 40
Elements of the same group in the periodic table have the same ____________.
Question 27 of 40
Which of the following gases is used as a preservative in carbonated drinks?
Question 28 of 40
The oxidation number of Mn in the radical MnO4 2- , is
Question 29 of 40
5.30 g of sodium trioxocarbonate(IV) exactly dissolved in 250 cm3 of distilled water at 27ºC to make a solution. The solubility of sodium trioxocarbonate(IV) (in mol dm-3 ) at 27ºC is
[Na = 23, C = 12, O = 16]
Question 30 of 40
Calculate the percentage by mass of water of crystallization in CuSO4 .5H2 O
[H = 1, O = 16, S = 32, Cu = 64]
Question 31 of 40
Which of the following is not a basic assumption of the kinetic theory of gases?
Question 32 of 40
I. Production of some elements and compoundsII. Electroplating of one metal by anotherIII. Purification of some metals
Which of the following combinations entirely consists of applications of electrolysis?
Question 33 of 40
If 8.62 g of a metal M was deposited when a 2.50 A current was passed through an aqueous solution containing salt of M for 2 hours 30 minutes, determine the valency of M.
[M = 74, 1 F = 96500 C]
Question 34 of 40
What volume of 2.5 M HNO3(aq) will contain exactly 0.05 moles of the acid?
Question 35 of 40
The gaseous product of the reaction between dilute trioxonitrate(V) acid and copper turnings is
Question 36 of 40
The IUPAC nomenclature of the organic compound above is
Question 37 of 40
\(\scriptsize Alkanol \: + \: Alkanoic\: acid \overset{conc.\: H_2SO_4}{\large\leftrightharpoons}\scriptsize Alkylalkanocoate \: + \: water \)
The equation above represents
Question 38 of 40
Which of the following organic compounds is insoluble in distilled water?
Question 39 of 40
Propan-2-ol is a ________.
Question 40 of 40
The catalytic hydrogenation of vegetable oil to fat is used in the industrial production of
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