CBSE 11TH CHEMISTRY - Online Test

Answer : Option C
Explaination / Solution:

P=P1+P2 (Acc. To Daltons Law) And P1×9=0.2xRT And P2×9=0.1xRT where T= 300K

Answer : Option B
Explaination / Solution:

pH=-log(cα) , Ka=cα2 . Lesser is the pH value greater is acidity. Also greater is Ka, lesser will be acidity.

Answer : Option A
Explaination / Solution:

By definition, the oxidation number of an atom is the charge that atom would have if the compound was composed of ions.

 The oxidation number of simple ions is equal to the charge on the ion. The oxidation number of sodium in the Na+ ion is +1, for example, and the oxidation number of chlorine in the Cl- ion is -1.

Answer : Option A
Explaination / Solution:

Molar massof  C6 H10 O5

=  Sum of the atomic masses of  six  C atoms  ,  ten  H  atoms  &   six  O  atoms

thus , substituting the required atomic masses  of

 C= 12 ,

H = 1 , &

 O = 16 ,

  we get ,

Molar mass   of  C6 H10 O5 

 = [ 6(12)+10(1)+5(16) ] u

= (72  +  10   +  80 ) u

=162 u

Answer : Option B
Explaination / Solution:

As we move from Cl to I,the atomic size increases,bond length increases,bond strength decreases,hence it becomes easier to release halogen and hence the order.I- is the a better leaving group.

Answer : Option C
Explaination / Solution:

ΔU = q + w (1st law of thermodynamics) q = +701J (heat is absorbed by system) w = -394 J (work is done by system) ΔU = 701- 394 = 307J

Answer : Option D
Explaination / Solution:

In a group movig from top to bottom the number of shells increases. So the atomic size increases. Although the effective nuclear charge increases but its effect is negligible in comparison to the effect of increasing number of shells.

Answer : Option C
Explaination / Solution:

The electron is a subatomic particle, symbol e− or β− , with a negative elementary electric charge.

The electron has a mass that is approximately 11836 that of the proton.

So mass of electron = 11836×1.6726219×10−27=9.1094×10−31kg

Answer : Option C
Explaination / Solution:

The death of Scandinavian forests was blamed on Pollution from UK power stations

Answer : Option C
Explaination / Solution:

Cation exchange resin have exchangeable hydrogen ions which makes the water acidic while anion exchange resin have exchangeable hydroxide ion which makes the water basic. Passing water to anion exchange resin as a second process after passing through anion exchange resin makes the water neutral.