The main buffer system of the human blood is____________?
A. H2CO3 – HCO3
B. H2CO3 – CO32-
C. CH3COOH – CH3COO–
D. NH2CONH2 – NH2CONH+
Submitted by :- Jamil Ahmed
A ‘breath test’ used by traffic police to check drunken driving uses ____?
| A) Turmeric on filter paper | B) Silica gel coated with silver nitrate |
| C) potassium permanganate-sulphuric acid | D) Potassium dichromatic-sulphuric acid |
Submitted by :- Muhammad Nawaz
The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is___________?
A. Dalton’s law
B. Gay Lussac’s law
C. Henry’s law
D. Raoult’s law
Submitted by :- Jamil Ahmed
The metallurgical process in which a metal is obtained in a fused state is called__________?
A. smelting
B. roasting
C. calcinations
D. froth floatation
Submitted by :- Jamil Ahmed
How many moles are in 22.2 grams of Calcium chloride, CaCl2?
The mass of 3.2 moles of ammonia (NH3) gas?
Mg+O2=MgO Balance the above Chemical equation?
| A) 2Mg + O2 —-> 2MgO | B) 2Mg + O —-> 2MgO |
| C) 2Mg + O —-> MgO2 | D) 2Mg + O2 —-> MgO2 |
Submitted by :- Muhammad Nawaz
In a molecule of carbon monoxide, what are the formal charges on the two atoms?
A. Carbon=0, Oxygen=0
B. Carbon= +1, Oxygen= -1
C. Carbon= -1, Oxygen= +1
D. Carbon=, Oxygen= -1
Submitted by :- Jamil Ahmed
Which of the following solvents would best facilitate an SN2 substitution reaction?
A. Water
B. Hexane
C. Dimethylflormamide (DMF)
D. Ethanol
Submitted by :- Jamil Ahmed