Chemistry

Beryllium and Aluminium have similar properties because they?

A. are both metals B. belong to the same group C. belong to the same period D. are positioned diagonally…

5 years ago

The radio isotope used in industrial radiography for the rapid checking of faults in welds and casting is?

A. carbon-14 B. phosphorus-32 C. cobalt D. iodine-131 Correct Answer: Option C - cobalt

5 years ago

How many atoms are present in 6.0g of magnesium? [Mg = 24, N.A = 6.02 x 10²³mol]

A. 1.20 x 10²² B. 2.4 x 10²² C. 1.51 x 10²² D. 3.02 x 10²² Correct Answer: Option C…

5 years ago

What is the concentration of a solution containing 2g of NaOH in 100cm³ of solution? [Na = 23, O =16, H = 1]

A. 0.40 moldm−³ B. 0.50 moldm−³ C. 0.05 moldm−³ D. 0.30 moldm−³ Correct Answer: Option B - 0.50 moldm−³

5 years ago

The solution of M also gives a white precipitate which dissolves in excess ammonia Therefore the cation in M is?

An aqueous solution of a metal salt, M. gives a white precipitate with NaOH which dissolves in excess NaOH. With…

5 years ago

The lUPAC name for?

A. 1-methyl pentane B. 3-methylbutane C. 2-methylbutane D. 1-dimethyl propane Correct Answer: Option C - 2-methylbutane

5 years ago

If one of the following oxides is heated with hydrogen or carbon using a bunsen burner. it is not reduced to the metal, which one is it?

A. lead oxide B. Magnesium oxide C. Copper oxide D. Tin oxide Correct Answer: Option B - Magnesium oxide Explanation…

5 years ago

What volume of oxygen will remain after reacting 8cm of hydrogen gas with 20cm of oxygen gas?

A. 10cm³ B. 12cm³ C. 14cm³ D. 16cm³ Correct Answer: Option D - 16cm³

5 years ago

The number of electrons in the valence shell of an element of atomic number 14 is?

A. 1 B. 2 C. 3 D. 4 Correct Answer: Option D - 2

5 years ago

Suitable reagents for the laboratory preparation nitrogen are?

A. sodium dioxonitrate(III) and ammonium chloride B. sodium trioxonitrate(V) and ammonium chloride C. sodium chloride and ammonium trioxonitrate(V) D. sodium…

5 years ago