Which of the following will not affect the degree of hardness in a sample of temporarily hard water?

A. Addition of washing soda

B. Adding of soap

C. Treatment with carbon exchange resin

D. Filtration

E. Distillation

Examples of polymers include the following except

A. starch

B. nylon

C. wool

D. perspex

E. glass

When the trioxonitrate (IV) salt of an alkali metal Y is heated, the formula of the residue is

A. Y₂O

B. YNO₂

C. Y₂O₃

D. Y (NO₂)₂

E. YO₂

Which of the following compounds of tin is a strong reducing agent?

A. SnCI₂

B. SnCI₄

C. SnO₂

D. SnH₄

E. Sn(OH)₂

In which of the following pairs are both substances deliquescent?

A. CaCI₂ and H₂SO₄

B. NaOH and MgSO₄ 7H₂O

C. CaCI₂ and NaOH

D. CUO and NaCI

E. CaCO₃ and MgCI₂

Producer gas is a mixture of

A. oxygen and hydrogen

B. Hydrogen and nitrogen

C. nitrogen and oxygen

D. nitrogen and carbon (ll) oxide

E. hydrogen and carbon (ll) oxide

An alkene may be converted to an alkane by

A. halogenation

B. hydrolysis

C. dehydration

D. hydrogenation

E. decomposition

Which of the following gases are diatomic except

A. nitrogen

B. helium

C. hydrogen

D. fluorine

E. oxygen

Which of the following is correct about the electrons in the 1s orbital? They

A. have the same spin

B. are easier to remove than those in the 2p orbital

C. are closest to the nucleus

D. have the same energy as those in the 2s orbital

E. have different magnetic quantum numbers

The product of the reaction between ethanol and excess acidified K_{2Cr2O2 is}

A. ethanal

B. ethylethanoate

C. ethanoic acid

D. ethyne

E. ethanedioic acid