GK-Chemistry Question and Answer
GK-Chemistry Question and Answer
1. The nucleus of an atom consists of
- electrons and neutrons
- electrons and protons
- protons and neutrons
- All of the above
2. The number of moles of solute present in 1 kg of a solvent is called its
- molality
- molarity
- normality
- formality
3. The most electronegative element among the following is
- sodium
- bromium
- fluorine
- oxygen
5. The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
- p-electrons in Ne(Z = 10)
- s-electrons in Mg(Z = 12)
- d-electrons in Fe(Z = 26)
- p-electrons in CI(Z = 17)
6. The metallurgical process in which a metal is obtained in a fused state is called
- smelting
- roasting
- calcinations
- froth floatation
7. The molecules of which gas have highest speed?
- H2 at -73oC
- CH4 at 300 K
- N2 at 1,027oC
- O2 at 0oC
8. The oldest rocks in the earth's crust were once molten, and came from deep inside the earth.
The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called
The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called
- granite
- basalt
- igneous rocks
- sedimentary rocks
9. The law which states that the amount of gas dissolved in a liquid is proportional to its partial
pressure is
pressure is
- Dalton's law
- Gay Lussac's law
- Henry's law
- Raoult's law
10. The main buffer system of the human blood is
- H2CO3 - HCO3
- H2CO3 - CO32-
- CH3COOH - CH3COO-
- NH2CONH2 - NH2CONH+