11.

At STP, a container has 1 mole of Ar, 2 moles of CO₂, 3 moles of O₂, and 4 moles of N₂. Without changing the total pressure if one mole of O₂ is removed, the partial pressure of O₂ is

• changed by about 16%

• halved

• changed by 26%

• unchanged

In a compound C, H and N are present in 9 : 1 : 3.5 by weight. If molecular weight of the compound is 108, then the molecular formula of the compound is

• C₂H₆N₂

• C₃H₄N

• C₆H₈N₂

• C₉H₁₂N₃

What amount of bromine will be required to convert 2 g of phenol into 2, 4, 6-tribromo phenol?

• 4.00

• 6.00

• 10.22

• 20.44

The energy of hydrogen atom in its ground state is -13.6 eV. The energy of the level corresponding to the quantum number n = 5 is

• -5.4 eV

• -0.54 eV

• -2.72 eV

• -0.85 eV

What is the amount of urea dissolved per litre, if aqueous solution is isotonic with 10% cane sugar solution (mol. wt. of urea = 60) ?

• 200 g/L

• 19.2 g/L

• 17.54 g/L

• 16.7 g/L

Conjugate acid ${\mathrm{S}}_2{\mathrm{O}}_8^{2-}$

• H₂S₂O₈

• H₂SO₄

• HS₂${\mathrm{O}}_8^{-}$

• HS${\mathrm{O}}_4^{-}$

The equilibrium constant of a reaction is 300. If the volume of reaction flask is tripled, the equilibrium constant is

• 300

• 600

• 900

• 100

The CO₂ gas does not follow gaseous laws at all ranges of pressure and temperature because

• it is triatomic gas

• its internal energy is quite high

• there is attraction between its molecules

• it solidify at low temperature

A 0.01 M ammonia solution is 5% ionised, its pH will be

• 11.80

• 10.69

• 7.22

• 12.24

In clatherates of xenon with water, the nature of bonding between xenon and water molecule is

• dipole induced dipole interaction

• coordinate

• hydrogen bonding

• covalent