21.

80 g of oxygen contains as many atoms as in

• 80 g of hydrogen

• 1 g of hydrogen

• 10 g of hydrogen

• 5 g of hydrogen

An ionic compound is expected to have tetrahedral structure if r+/r- lies in the range of

• 0.414 to 0.732

• 0.225 to 0.414

• 0.155 to 0.225

• 0.732 to 1

Dalda is prepared from oils by

• oxidation

• reduction

• hydrolysis

• distillation

Which metal has a greater tendency to form metal oxide?

• Cr

• Fe

• Al

• Ca

The correct order in which the first ionisation potential increases is

• Na, K, Be

• K, Na, Be

• K, Be, Na

• Be, Na, K

The maximum number of hydrogen bonds that a molecule of water can have is

• 1

• 2

• 3

• 4

The reagent used to convert an alkyne to alkene is

• Zn/HCl

• Sn/HCl

• Zn-Hg/HCl

• Pd/H₂

Which of the following species does not exert a resonance effect?

• C₆H₅NH₂

• ${\mathrm{C}}_6{\mathrm{H}}_5\stackrel{+}{\mathrm{N}}{\mathrm{H}}_3$

• C₆H₅OH

• C₆H₅Cl

How many optically active stereomers are possible for butan-2,3-diol?

• 1

• 2

• 3

• 4

Methoxy methane and ethanol are

• position isomers

• chain isomers

• functional isomers

• optical isomers