CHEMISTRY

1. The nucleus of an atom consists of
A. electrons and neutrons
B. electrons and protons
C. protons and neutrons
D. All of the above
Ans - C

2. The number of moles of solute present in 1 kg of a solvent is called its
A. molality
B. molarity
C. normality
D. formality
Ans - A

3. The most electronegative element among the following is
A. sodium
B. bromine
C. fluorine
D. oxygen
Ans - C

4. The metal used to recover copper from a solution of copper sulphate is
A. Na
B. Ag
C. Hg
D. Fe
Ans - D

5. The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
A. p-electrons in Ne(Z = 10)
B. s-electrons in Mg(Z = 12)
C. d-electrons in Fe(Z = 26)
D. p-electrons in CI(Z = 17)
Ans - D

6. The metallurgical process in which a metal is obtained in a fused state is called
A. smelting
B. roasting
C. calcinations
D. froth floatation
Ans - A


7. The molecules of which gas have highest speed?
A. H2 at -73oC
B. CH4 at 300 K
C. N2 at 1,027oC
D. O2 at 0oC
Ans - A

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
A. granite
B. basalt
C. igneous rocks
D. sedimentary rocks
Ans - C

9. 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
Ans - C

10. The main buffer system of the human blood is
A. H2CO3 - HCO3
B. H2CO3 - CO32-
C. CH3COOH - CH3COO-
D. NH2CONH2 - NH2CONH+
Ans - A