Jamb Chemistry Past Questions and Answers

Question 2141:

• JAMB 2020

Four elements P, Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively. Which of these elements is noble gas?

A. P
B. Q
C. R
D. S

Question 2142:

• JAMB 2020

The products of the thermal decomposition of ammonium trioxonitrate(v) are?

A. Nitrogen (I) Oxide and Water
B. Ammonia and Oxide
C. Nitrogen and Water
D. Nitrogen (IV) Oxide and Water

Question 2143:

• JAMB 2020

How many valence electrons are contained in the element \(^{31}_{15}P\)?

A. 3
B. 4
C. 15
D. 31

Question 2144:

• JAMB 2020

The number of molecules of Carbon(iv)Oxide produced when 10.0g of CaCO\(_3\) is treated with 0.2dm\(^3\) of 1 Mole of HCL in the equation
CaCO\(_3\) + 2HCL ⇒ CaCl\(_2\) + H\(_2\) O + CO\(_2\) , is ?

A. 1.00 X 10\(^{23}\)
B. 6.02 X 10\(^{23}\)
C. 6.02 X 10\(^{22}\)
D. 6.02 X 10\(^{24}\)

Question 2145:

• JAMB 2020

The volume occupied by 1.58g of a gas at S.T.P is 500cm\(^3\). What is the relative molecular mass of the gas? [ G.M.V at S.T.P = 22.4dm\(^{3}\) ]

A. 28
B. 32
C. 44
D. 71