Which one of the following carbonate is water insoluble ?
A. Na2CO3
B. K2CO3
C. (NH4)2CO3
D. CaCO3
Submitted by :- Jamil Ahmed
Which one of the following substances conducts electricity by the movement of ions ?
A. Graphite
B. Copper
C. Molten sodium chloride
D. Mercury
Submitted by :- Jamil Ahmed
The ore CaSO4.H2O has the general name_______________?
Which of the following sulphates is not soluble in water ?
A. Sodium sulphate
B. Potassium sulphate
C. Zinc sulphate
D. Barium sulphate
Submitted by :- Jamil Ahmed
Which element is necessary for normal leaf development ?
A. Si
B. Ba
C. Mg
D. Ca
Submitted by :- Jamil Ahmed
The word Alkali means__________________?
A. Base
B. Basic salt
C. Ashes
D. Spirit
Submitted by :- Jamil Ahmed
Which one is least ionic in nature and decompose on heating ?
A. LiOH
B. NaOH
C. KOH
D. CsOH
Submitted by :- Jamil Ahmed
How many electrons are there in benzene to form delocalized electron cloud________________?
A. 3
B. 4
C. 6
D. 8
Submitted by :- Jamil Ahmed
Phenanthrene is a fused polycyclic compound contains __________ benzene rings ?
A. Two
B. Three
C. Four
D. Five
Submitted by :- Jamil Ahmed
Addition of 2% gypsum in cement________________?
A. Triggers hydration
B. Triggers hydrolysis
C. Prevents rapid hardening
D. all of the above
Submitted by :- Jamil Ahmed