1. 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)
Explanation: The number of d-electrons in Fe2+ (Z=26) is not equal to the number of p - electrons in Cl(Z=17).
2. The metallurgical process in which a metal is obtained in a fused state is called
a) smelting
b) roasting
c) calcinations
d) froth floatation
Explanation: The process of extraction of metal in its molten state by any reducing agent in the presence of flux is called smelting.
3.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
Explanation: Among the given gases, hydrogen at −50oC has maximum value of T/M and highest speed.
4.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
Explanation: 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 igneous rocks.
5.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) aoult's law
Explanation: In physical chemistry, Henry's law is a gas law that states that the amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid. The proportionality factor is called Henry's law constant.
6. The metal does not give H2 on treatment with dilute HCL is
a) zn
b) Fe
c) Ag
d) Ca
Explanation: The metal does not give H2 on treatment with dilute HCL is Ag.
7. The number of g-molecule of oxygen in 6.02 x 1024 CO molecules is
a) 1 gram of molecule
b) 0.5 gram of molecule
c) 5 gram of molecule
d) 10 gram of molecule
Explanation: 5 gram of molecule
8.The most extensive, commercially useful source of thorium as monazite sand occurs in India at
a) Orissa coast
b) Travancore coast
c) West Bengal coast
d) Gujarat coast
Explanation: The most extensive, commercially useful source of thorium as monazite sand occurs in India at Travancore coast.
9. The main active constituent of tea and coffee is
a) nicotine
b) chlorophyll
c) caffeine
d) aspirin
Explanation: Caffeine is the main active constituent of tea and coffee.
10. The maximum number of isomers for an alkene with molecular formula C4H8 is
a) 5
b) 4
c) 2
d) 3
Explanation: The maximum number of isomers for an alkene with molecular formula C4H8 is 4.