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\(^{-3}\)

How many atoms are present in 6.0g of magnesium? [Mg = 24, N.A = 6.02 x 10 \(^{23}\)mol]

A. 1.20 x 10\(^{22}\)

B. 2.4 x 10\(^{22}\)

C. 1.51 x 10\(^{22}\)

D. 3.02 x 10\(^{22}\)

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-60

D. iodine-131

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 to each other

ME + nF -----> pG + qH
In the equation shown, the equilibrium constant is given by?

A. \(\frac{[E]^m[F]}{[G]^p[H]^q}\)

B. \(\frac{[E][F]}{[G][H]}\)

C. \(\frac{[G]^p[H]^q}{[E]^m[F]^n}\)

D. \(\frac{[G][H]}{[E][F]}\)

(I). 3CuO(s) + 2NH3(g) -----> 3Cu(s) + 3H2O(l) + N2(g)
(II). 2NH3(g) + 3Cl2(g) -----> 6HCl(g) + N2(g)
(III). 4NH3(g) + 3O2(g) -----&

A. basic properties of ammonia

B. acidic properties of ammonia

C. reducing properties of ammonia

D. oxidizing properties of ammonia

The salt that reacts with dilute hydrochloric acid to produce a pungent smelling gas which decolourizes acidified purple potassium tetraoxomanganate (VII) solution is

A. Na\(_2\)SO\(_4\)

B. Na\(_2\)SO\(_3\)

C. Na\(_2\)S

D. Na\(_2\)CO\(_3\)

The refreshing and characteristic taste of soda water and other soft drinks is as a result of the presence of

A. carbon(IV)oxide

B. carbon(ll)oxide

C. soda

D. glucose

Which of the following are mixtures?
I. Petroleum
II. Rubber latex
III. Vulcanizer's solution
IV. Carbon sulphide

A. I, II and III

B. I, II and IV

C. I and II only

D. I and IV

A balanced chemical equation obeys the law of

A. conservation of mass

B. definite proportions

C. multiple proportions

D. conservation of energy