Post Utme Chemistry Past Questions and Answers

Question 916:

Two gas cylinder \(cc ^{238} U \rightarrow \quad \rightarrow \quad{ }_{90}\) Th :etylene respectively one test, which can be used to distinguis \(h\) between them is by

A. Passing each gas through dilute potassium permanganate sodium
B. Pass each gas through ammonical copper 1 chloride solution
C. Passing each through bromide water
D. Treating each gas catalytically with excess hydrogen gas

Question 917:

Brass and bronze are both metallic alloys, which of the following constituents is common to be alloys

A. Tin
B. Zinc
C. Copper
D. Lead

Question 918:

An organic compound has the empirical formula \(CH , O\). What is its milecular formula if its vapour density is \(90 ?( H =1, C \quad=12.0=16)\)

A. \(C 4 H 304\)
B. \(C 12 H 30\)
C. \(C 4 H 1005\)
D. \(C 6 H 1 O 6\)

Question 919:

A technique that can be used to show that chlorophyll pigment in athixfure of chemical compound and not a single coloured _____________

A. Hydrolysis
B. Crystallization
C. Chromatography
D. Sublimation

Question 920:

Which of the following statements is not true as wove from left to right along the periodic table?

A. Atomic mass of elements increase
B. Electro positive character of
C. Atomic number of element inereases elementsincrease
D. Number of electrons in the quterngstonbits of elements increases