Properties of Oxygen

Q.

The nature of B₂O₃ is:

1. Acidic

2. Amphoteric

3. Neutral

4. Basic

Q. Percentage of hydrogen in water

Q. 76 We say that oxyacid of phosphorus are always sp3 hybridised than when we remove one water molecule from H3PO4 than meta phosphoric acid is formed which ih sp2 why ?

Q. Paraffins are soluble in (a) distilled water (b) benzene (c) methanol (d) sea water

Q. how to compare solubility of gases?

Q. The number of unpaired electrons in $O_2$ molecule is:

1. 3
2. Zero
3. 2
4. 1

Q. Cyclohexane, a hydrocarbon floats on water because (a) it is immiscible with water (b) its density is low as compared to water (c) it is non-polar substance (d) it is immiscible and lighter than water

Q. For which of the following process is Oxygen a prerequisite?

1. Inspiration
2. Expiration
3. Both (A) and (B)
4. Inspiration and combustion

Q. For patients who suffer from low oxygen levels, only "humidified oxygen" is supplied as opposed to dry oxygen gas - True or False?

1. True
2. False

Q. show the chemical reaction na2o is basic oxide

Q. Show by a chemical reaction with water that Na2O is a basic oxide and CO2 is an acidic oxide

Q. $O\left(g\right)+e^{-}⟶O^{-}\left(g\right),△H_{eg}=-ve$

1. True
2. False

Q.

which of the following is used as a rocket fuel

a- liquid N2 + liquid O2

b- liquid H2+liquid N2

c- liquid O2+ liquid Ar

d- liquid H2 + liquid O2

Q.

what is the meaning of deliquescent