The following atoms of carbon ¹²₆C, ¹³₆C and ¹⁴₆C can be described as?

A. Allotropes

B. Isomers

C. Isotopes

D. Isotones

An atom X consist of 6 protons, 6 electrons and 7 neutrons. Which of the following representations of the atom is correct?

A. ¹³₆X

B. ¹³₇X

C. ¹⁹₆X

D. ¹⁹₇X

How many electron are present in 94Be2+?

A. 2

B. 4

C. 5

D. 6

When element \(_{20}\)Y combines with element \(_8\)Z, it forms

A. A covalent compound , YZ is formed

B. A covalent compound, ZY is formed

C. An ionic compound, YZ is formed

D. An ionic compound, ZY is formed

The boiling points of HF, H2O and NH3 increase in the order of

A. NH₃

B. H₂O < HF

C. HF < NH₃ < H₂O

D. NH₃ < HF < H₂O

Chemicals that are produced in small quantities and with very degree of purity are

A. Bulk chemicals

B. Fine chemicals

C. Heavy chemicals

D. Light chemicals

The mass of potassium hydroxide required to make 300.ocm³ of 0.4 moldm^-3 solution is {KOH = 56.0}

A. 26.88g

B. 13.44g

C. 6.72g

D. 3.36g

Metals can be stretched into wires because they are

A. Ductile

B. Good conductors

C. Lustrous

D. Malleable

Aluminium is used in the manufacture or aircraft because it

A. Is hard and brittle

B. Is light and resists corrosion

C. Has high density and conducts electricity

D. Is malleable and ductile

An unsaturated solution differs from a saturated solution at a given temperature because it

A. Cannot dissolve more solute

B. Can hold more solute than it can actually dissolve

C. Can still dissolve more solute at given temperature

D. Form crystal more easily on cooling