Class XI

 When hot molten liquid cools,
  1. first crystals are most pure
  2. impure substances may also form crystals
  3. it turns into gas
  4. it turns into aqueous solution
In periodic table, valence electrons are indicated by
  1. Group Number
  2. Shell Number
  3. Period Number
  4. Atomic mass
 Number of electrons (e-) in phosphorus (P) is 15. valence electrons shall be
  1. 2
  2. 4
  3. 1
  4. 5
Bases (OH-) are
  1. corrosive
  2. turn litmus from blue to red
  3. turn litmus from red to blue
  4. non-metal oxides
 First element in periodic table to have 8 valence electrons in third shell is
  1. Silicon
  2. Chlorine
  3. Argon
  4. Potassium
Time Elapsed

HR : MIN : SEC
Question Answered
0
Score out of 100
0

Get Started!

we provide the best
services to our students

AmazingCounters.com Views

 

LKG - 12th

Rs 1,999  Annual
Plan
TOP