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Tambaya 1 Rahoto
An experiment to test the conductance of 0,1 M solutions of the substances listed below was perform.
I ammonia
II ammonium chloride
III ethanoic acid
IV sodium ethanoate
Which pair of substances show the least conductance?
Bayanin Amsa
Tambaya 2 Rahoto
The atomic number of iron is 56. The number of unpaired electrons in the Fe3+ ion is
Tambaya 4 Rahoto
When an electric current is passed through a solution containing dilute tetraoxosulphate (Vi) acid, 190 cm3 of hydrogen gas is evolved. if the measurements were made at 26°C and 736 mmHg, what is the volume of hydrogen at s.t.p.?
Bayanin Amsa
Tambaya 6 Rahoto
The position of an element in the Periodic Table is determined by
Tambaya 7 Rahoto
Ethanol is a product of fermentation of simple sugars. Which method is used to separate ethanol from the other products?
Tambaya 9 Rahoto
if an element X with atomic number 13 combines with an element Y whose atomic number is 8 the most likely formula of the compound formed between X and Y is?
Tambaya 10 Rahoto
Faraday s first law of electrolysis can be expressed mathematically as
Bayanin Amsa
Tambaya 11 Rahoto
NaCl(s) does NOT conduct electricity, but N(aq) does. This is because
Tambaya 12 Rahoto
On exposure to hydrogen sulphide, moist lead (II) ethanoate paper turns
Bayanin Amsa
Tambaya 13 Rahoto
Which method is NOT used to determine rate of a reaction?
Tambaya 15 Rahoto
The high boiling point of hydrogen fluoride can be explained in terms of
Tambaya 16 Rahoto
Which compound is a product of the hydrolysis of the of CH3COOC3H7 with aqueous sodium hydroxide?
Tambaya 17 Rahoto
Which compound will have the lowest boiling point?
Tambaya 18 Rahoto
The green colour solution of an Fe2 salt changes to a brown solution of an Fe3+ salt by
Bayanin Amsa
Tambaya 19 Rahoto
What is the ratio of the rate of diffusion of carbon(IV) oxide to that of propane, under the same conditions? [H = 1; C= 12; 0= 161
Tambaya 20 Rahoto
To test for the presence of chloride ions in ion, correct sequence of reagents to use is
Bayanin Amsa
Tambaya 21 Rahoto
Detergents are better than soaps for washing in hard water because
Tambaya 23 Rahoto
How much sodium hydroxide is required to nka 250 cm3 ofa0.1 molar solution? Na=23; 0=16; H=1]
Tambaya 24 Rahoto
The Atomic theory model which explains that electrons in an atom revolve round quantized energy levels is attributed to
Tambaya 25 Rahoto
A gas X diffuse through porous partition at the rate of 3 cm3 per second. Under the same condition hydrogen diffused at the rate of 15 cm3 per second.
What is the 42. relative molecular mass of X.
Tambaya 28 Rahoto
Which metal will dissolve in aqueous sodium hydroxide?
Tambaya 29 Rahoto
The Kinetic theory can NOT be used to explain
Tambaya 31 Rahoto
The molar mass of a compound X is 56. its empirical formula is CH2. X is
Bayanin Amsa
Tambaya 33 Rahoto
20 cm3 of 0.09 mol dm3 solution of tetraoxosuiphate (Vi) acid requires 30cm3 of sodium hydroxide solution for complete neutralization. The molar concentration of sodium hydroxide is [H = 1; S = 32; 0 = 16; Na = 23]
Bayanin Amsa
Tambaya 34 Rahoto
The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is
Bayanin Amsa
Tambaya 35 Rahoto
in any chemical reaction, the total mass of products is always equal to that of the reactants.
This Is statement of the law of:
Tambaya 36 Rahoto
what dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \)
Bayanin Amsa
Tambaya 39 Rahoto
Which of the following is TRUE of a catalyst? I. it alters the activation energy of a reaction
II. it is effective in a reaction but cannot initiate a reaction
III, it affects the equilibrium of a reversible reaction
IV. it affects the overall reaction
Tambaya 40 Rahoto
A measure of the degree of disorderliness in a chemical system is known as the
Tambaya 41 Rahoto
The best way to distinguish between Na2CO3and NaHCO2 is by.
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