The pH of a solution obtained by mixing 100cm3 of a 0.2M solution of NaOH is?

• A. 1.3
• B. 7.0
• C. 9.7
• D. 12.7

The balanced equation for the reaction of Tin (ii) salt with potassium heptaoxodichromate (VI) in an acidic medium can be represented as \(eSn^{2+} + fCr_2O_7^{2+} + gH^+ \rightarrow hSn^{4+} + iCr^{3+} + jH_2O\). e, f, g, h, i, and j are respectively:

• A) 3, 5, 6, 3, 1, and 4
• B) 3, 1, 14, 3, 2 and 7
• C) 3, 2, 6, 1, 5 and 6
• D) 5, 2, 1, 5, 3 and 2

In metallic solid, the forces of attraction is between the mobile valence electrons and the

• A. atoms
• B. neutrons
• C. negative ions
• D. positively charged nuclei

Four elements P,Q,R and S have 1,2,3, and 7 electrons in their outermost shells respectively. The element which is unlikely to be a metal is?

• A. P
• B. Q
• C. R
• D. S

Which of the following ions require the largest quantity of electricity for discharge at an electrode?

• A. 2.0 mole of Q³⁺
• B. 2.5 mole of R²⁺
• C. 4.0 mole of Y^-
• D. 3.0 mole of T^-

n monosaccharide P ⇌ Q polysaccharide -n water. In the process above, P and Q respectively represent

• A) Condensation and hydrolysis
• B) Fermentation and condensation
• C) Polymerization and hydrolysis
• D) Polymerization and condensation

The halide used widely in photography is

• A. ammonium chloride
• B. calcum chloride
• C. silver bromide
• D. sodium brmide

Isotopes of an element have

• A. The same number of protons but different/same numbers of neutrons.
• B. The same number of neutrons and electrons
• C. The same number of protons and neutrons
• D. The same number of protons and electrons

Sulphur exists in six forms in the solid state. This property is known as?

• A. isomerism
• B. allotropy
• C. isotopy
• D. isomorphism

Calculate the volume in cm³of oxygen evolved as s.t.p. when a current of 5 A is passed through acidified water for 193s {F = 96500 C/mol, Molar volume of a gas at s.t.p. = 22.4 dm³}

• A) 224.000 dm³
• B) 0.056 dm³
• C) 0.224 dm³
• D) 56.000³