polymerism
isotopy
isomorphism
isomerism
allotrophy
Correct answer is E
Allotropy or allotropism is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of these elements.
Ca(OH)2
CaCO3
CaHCO3
CaSO4
N2CO3
Correct answer is A
No explanation has been provided for this answer.
Heating ammonia gas with tetraoxosulphate (VI) acid
Heating ammonium trioxonitrate (V) with tetraoxosulphate (VI) acid
Heating sodium trioxonitrate (V) with tetraoxosulphate (VI) acid
Heating potassium trioxonitrate (V) with calcium hydroxide
Heating a mixture of ammonia gas and oxygen.
Correct answer is C
No explanation has been provided for this answer.
+ 28.65 kJ
- 28.65KJ
+ 57.3KJ
- 114.6 KJ
- 229.2 KJ
Correct answer is D
NaOH + HCl = NaCl + H2O \(\Delta\)H = -57.3kJ
Heat of reaction of 2NaOH + H2O4
NaSO4 + H2O is
= 57.3 x 2 = -114.6 kJ
For the reaction 2Fe3+ 2I- \(\to\) 2Fe2+ + I2, which of the following statements is TRUE?
Fe is oxidized to Fe3+
Fe3+ is oxidized to Fe2+
I- is oxidized to I2
I- is reduced to I2
I- is displacing an electron from Fe3+
Correct answer is C
No explanation has been provided for this answer.