Chemistry

Which of the following elements has the electronic configuration:1s² 2s² 2p6 3s² 3p¹? [11Na, 13Al, 14N,16S]

A. Al B. Na C. N D. S Correct Answer: Option A A. Al

6 years ago

Consider the reaction represented by the equation: 238/92U + ¹/0 → 139/56Ba + 94/36Kr + 3 ¹/0n. The reaction represents a?

A. nuclear fission B. nuclear fusion C. radioactive decay D. spontaneous disintegration Correct Answer: Option A A. nuclear fission

6 years ago

How many orbitals are associated with the p-sub energy level?

A. 2 B. 3 C. 5 D. 6 Correct Answer: Option B B. 3 Explanation  The highest number of electrons…

6 years ago

If 100 atoms of element X contains 70 atoms of 9X and 30 atoms of 11X, calculate the relative atomic mass of X.

A. 9.6 B. 10.6 C. 11.6 D. 20.0 Correct Answer: Option A A. 9.6

6 years ago

How many protons does 40//20Ca contain?

A. 20 B. 30 C. 40 D. 60 Correct Answer: Option A A. 20

6 years ago

Which of the following scientists discovered the neutron?

A. Ernest Rutherford B. J.J Thompson C. James Chadwick D. R. A. M illikan Correct Answer: Option C C. James…

6 years ago

Compound N reacts with sodium metal to produce a gas that gives a ‘pop’ sound with a burning splint N also reacts with ethanoic acid to give a sweet-smelling liquid. Compound N is an?

A. alkanol B. alkanoate C. alkane D. alkanoic acid Correct Answer: Option A A. alkanol

6 years ago

An organic compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. What is the empirical formula of the compound? [O = 16.0, C = 12.0, H = 1.0]

A. C2HO B. CHO C. CH2O D. CHO2 Correct Answer: Option C C. CH2O

6 years ago

The IUPAC name of C2H6COOC2H6 is?

C2H6COOC2H6 A. ethyl ethanoate B. ethyl propanoate C. propyl ethanoate D. propyl propanoate Correct Answer: Option B B. ethyl propanoate

6 years ago

The products of fermentation of sugar are?

A. carbon(IV) oxide and water B. ethanol and carbon (IV) oxide C. ethanol and water D. ethanol and enzymes Correct…

6 years ago
Show more Posts
Show previous Posts