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UTME Chemistry 2007 JAMB Past Questions and Answers, Jamb, Pre-degree, Nursing, Waec, Neco

UTME Chemistry 2007 JAMB Past Questions and Answers, Jamb, Pre-degree, Nursing, Waec, Neco

UTME Chemistry 2007 JAMB Past Questions and Answers


1. How many electrons are in the L shell of 3115P?

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Options

A) 5

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B) 8

C) 18

D) 2

The correct answer is B.

2. If the electron configuration of a element is p1s2 2s2 2P5, how many unpaired electron are there?

Options

A) 2

B) 8

C) 1

D) 4

The correct answer is C.

3. Dissolving some pellets of NaOH in water would result in

Options

A) a decrease in the free energy of the solution

B) a decrease in the entropy of the solution

C) a lowering of the temperature of te solution

D) an increase in the entropy of the solution

The correct answer is D.

4. Calculate the number of moles of HCl present in 20cm3 of a 0.75M solution of the acid

Options

A) 0.015 mole

B) 0.038 mole

C) 3.800 moles

D) 1.500 moles

The correct answer is A.

Explanation:

Number of moles = (conc. in mol/dm3*volume in cm3)/1000
(0.75 * 20)/100 = 0.015 mole

MnO2(s) + xHCl(aq) → MnCl2(aq) + yH2O(l) + zCl2(g)

5. In theequation above, what are the values of xy and z respectively

Options

A) 2, 1, 2

B) 4, 1, 2

C) 4, 2, 1

D) 1, 2, 1

The correct answer is C.

 

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