Warning: preg_match_all(): Compilation failed: missing terminating ] for character class at offset 142 in /home/erudites/web/erudites.ng/public_html/wp-content/plugins/seo-by-rank-math/includes/replace-variables/class-post-variables.php on line 543

Warning: preg_match_all(): Compilation failed: missing terminating ] for character class at offset 142 in /home/erudites/web/erudites.ng/public_html/wp-content/plugins/seo-by-rank-math/includes/replace-variables/class-post-variables.php on line 543
Chemistry Archives - Page 33 of 414 - Erudites Academy

Chemistry

The characteristic colour of the flame shown when a copper sail moistened with concentrated hydrochloric acid on a platinum wire is put on bunsen burner is?

A. lilac B. green C. yellow D. brick-red Correct Answer: Option B - green

4 years ago

Which of the following pairs of substance will react further with oxygen to form a higher oxide?

A. CO2 and H2O B. NO and H2O C. CO and CO2 D. SO2 and NO Correct Answer: Option D…

4 years ago

The ion that will give a white precipitate with aqueous NaOH and soluble in excess of the base is?

A. Ca²+ B. Mg²+ C. Zn²+ D. Cu²+ Correct Answer: Option C = Zn²+

4 years ago

Dynamic equilibrium describes a situation where?

A. a reaction gives back the reactant B. te concentration of the reactant and products is equal C. both forward…

4 years ago

What weight of NaCl is needed to make 2.0 dm³ of a 1.5M solution? [Na = 23, Cl = 35.5]

A. 116 g B. 175 g C. 87 g D. 58 g Correct Answer: Option B - 175 g Explanation…

4 years ago

Smog usually occurs over cities which?

A. burn a lot of fossil fuels B. have very few plants C. are surrounded by water D. are overpopulated…

4 years ago

The efficiency of a solid catalyst to increase reaction rates depends on its?

A. surface area B. solubility C. concentration D. quantity Correct Answer: Option A - surface area

4 years ago

Carbon exist naturally in the combined state as?

A. graphite B. coal C. diamond D. wood Correct Answer: Option D - wood

4 years ago

The group IA metals are not found free in nature because they?

A. are very reactive and unstable B. are malleable and ductile C. have high melting and boiling point D. conduct…

4 years ago

On heating, which of the following compounds will decompose to the free metal; nitrogen (IV) oxide and oxygen?

A. Ca(NO3)2 B. Cu(NO3)2 C. AgNO3 D. NaNO3 Correct Answer: Option C - AgNO3

4 years ago
Show more Posts
Show previous Posts