Average rate of reaction = ( change in concentration) / time

Change in concentration = (0.04 - 0.05)M  = - 0.01M

Time =30 minutes

Average rate of reaction = - 0.01M / 30 mins = 0.00033 mins = 3.3 X 10^-4 M/  mins

12 elements would be there in 2nd period.

Because 2nd shell  has 4 orbitals  and 4X3= 12 . Hence 12 electrons would be filled in 2nd shell .

Charge -Radius Ratio: It is a measuring technique which describes the metallic character of elements.

According to charge/radius ratio, the element having c/r less than 7.0 are called as metallic, ane those elements which have charge /radius ratio greater than 7.0 are called as non-metallic, whereas it has been seen that the element which has charge/radius ratio slightly greater than 7.0 are called as semi-metals or more commonly called as semi -conductor.

Mass of hydrogen =10g

No. of moles of hydrogen =w/M= 10g/2gmol^-1 =5mol

Mass of oxygen =64g

Moles of oxygen = w/M = 64g /32gmol^-1 = 2mol

According to the reaction, 2H₂  + O₂     ------------     2 H₂O

Hence, for 2 moles  of oxygen, 4 moles of hydrogen are required  and 4 moles of water is produced. Here oxygen is the limiting reagent

As Vrms=√3RT/√m

V1/V2=√m2/√m1

=√m2/√4m2

=1/2

Molality  of NaOH is 1.25,percent by weight of NaOH  is 40g

• The only primary alcohol that can be prepared by the indirect hydration of alkene is ethyl alcohol

This reaction occurs fastest in

N,N'-dimethylformamide (DMF).

Solution: 

• To Produce electrophile 
• VESPR Notation of ClF₃ is AX₃E₂. AX₃E₂ has To shaped shape.

The lobes of d_xy orbital are oriented in between the axes at an angle 45, So the  probability of finding electron in a d_xy orbital is maximum at an angle of 45 degree from x and y axis.