The number of oxygen atoms in 4.4gm of CO₂ is

• 1.2 × 10²³

• 6 × 10²²

• 6 × 10²³

• 12 × 10²³

0.30 g of an organic compound containing C, H and oxygen on combustion yields 0.44 g of CO₂ and 0.18 g of H₂O. If one mole of compound weighs 60, then molecular formula of the compound is

• CH₂O

• C₃H₈O

• C₄H₆O

• C₂H₄O₂

What amount of dioxygen (in gram) contains 1.8 × 10²² molecules?

• 0.0960

• 0.960

• 9.60

• 96.0

An organic compound contains C = 40%, H = 13.33% and N = 46.67%. Its empirical formula is

• C₂H₂N

• C₃H₇N

• CH₄N

• CHN

The mass of BaCO₃ produced when excess CO₂ is bubbled through a solution of 0.205 mole Ba(OH) is :

• 81 gm

• 40.5 gm

• 20.25 gm

• 162 gm

A compound contains 54.55% carbon, 9.09% hydrogen, 36.36% oxygen. The empirical formula of this compound is:

• C₃H₅O

• C₄H₈O₂

• C₂H₄O₂

• C₂H₄O

What is the effect of having the pressure by doubling the volume on the following system at 500°C?

H₂ (g) + I₂ (g) $\rightleftharpoons$ 2HI (g)

• Shift to reactant side

• Shift to product formation

• Liquefaction of HI

• No effect

The number of coulombs required to reduce 12.3 g of nitrobenzene to aniline is :

• 115800 C

• 5790 C

• 28950 C

• 57900 C

The strength in volumes of a solution containing 30.36 g/L of H₂O₂ is:

• 10 volume

• 20 volume

• 5 volume

• None of these

470.

Which of the following concentration units is independent of temperature ?

• Normality

• Molarity

• Formality

• Molality