The ionization energy of hydrogen atom in the ground state is:

• 13.6 MeV

• 13.6 eV

• 13.6 Joule

• Zero

When pure water boils vigorously, the bubbles that rise to the surface are composed primarily of:

• air

• hydrogen

• hydrogen and oxygen

• water vapour

Which compound, when dissolved in water, conducts electricity and forms a basic solution?

• HCL

• CH₃COOH

• CH₃OH

• NaOH

The principal use of hydrofluoric acid is:

• in etching glass

• as a bleaching agent

• as an extremely strong oxidizing agent

• in the preparation of strong organic fluorine compounds

55.

The species that has the same number of electrons as _{${}_{17}{}^{35}Cl$} is:

• ${}_{16}{}^{32}S$

• ${}_{16}{}^{34}S^{+}$

• ${}_{18}{}^{40}A{r}^{+}$

• ${}_{16}{}^{35}S^{2-}$

The compound C₆H₁₂O₄ contains:

• 22 atoms per mole

• twice the mass per cent of H as compared to the mass per cent of C

• six times the mass per cent of C as compared to the mass percent-of H

• thrice the mass per cent of H as compared to the mass per cent of O

The proposition' 'equal volumes of different gases contain equal numbers of molecules at the same temperature and pressure' is known as

• Avogadro's hypothesis

• Gay-Lussac's hypothesis

• Planck's hypothesis

• Kirchhoff's theory

Who among the following shared the Nobel Prize in 1962 along with Francis Crick and James Watson for their discoveries concerning the molecular structure of nucleic acids?

• Erwin Chargaff

• Maurice Hugh Frederick Wilkins

• Rosalind Franklin

• Phoebus Levene

Water boils at a lower temperature at high altitudes, because:

• the air pressure is less

• outside temperature is less

• latent heat is less

• None of the above

How much CO₂ is produced on heating of 1 kg of carbon?

• $\frac{11}{3}kg$

• $\frac{3}{11}kg$

• $\frac{4}{3}kg$

• $\frac{3}{4}kg$