21.

A molecule of urea can show :

• chain isomerism

• position isomerism

• geometrical isomerism

• tautomerism

Which of the following compounds will exhibit cis-trans isomerism ?

• 2-butene

• 2-butyne

• 2-butanol

• Butanone

Propyne when passed through a hot iron tube at 400°C produces :

• benzene

• methyl benzene

• dimethyl benzene

• trimethyl benzene

Glycerine contains:

• 1 ° carbon

• 2° carbon

• 3° carbon

• both 1 ° and 2° carbon

2 gm of aluminium is treated separately with excess of dil. H₂SO₄ and excess of NaOH, the ratio of volume of hydrogen evolved is :

• 1 : 1

• 2 : 3

• 1 : 2

• 2 : 1

Thomas slag is referred to as :

• calcium silicate

• calcium phosphate

• barium phosphate

• strontium silicate

The main component of glass which gives heat resistance to laboratory glassware is 

• PbO

• MgO

• B₂O₃

• Al₂O₃

The characteristic colours given by calcium, strontium and barium in the flame test are respectively :

• brick red, apple green, crimson

• crimson, apple green, brick red

• crimson, brick red, apple green

• brick red, crimson, apple green

aK₂Cr₂O₇ + bHCl + cH₂SO₄ → xCrO₂Cl₂ + yKHSO₄ + zH₂O.

The above equation balances when:

• a = 2; b = 4; c = 6 and x = 2; y = 6; z = 3

• a = 4; b = 2; c = 6 and x = 6; y = 2; z = 3

• a = 6; b = 4; c = 2 and x = 6; y = 3; z = 2

• a = 1; b = 4; c = 6 and x = 2; y = 6; z = 3

The pair of [Co(SO₄)(NH₃)₅]Cl and [CoCl(NH₃)₅] SO₄ constitutes :

• ionisation isomers

• optical isomers

• linkage isomers

• co-ordination isomers