Horizontal rows in the periodic table are called
Q.1.The freezing point of benzene decreases by 0.45°C when 0.2 g of acetic acid is added to 20 g of benzene. If acetic acid associates to form a dimer in benzene, percentage association of acetic acid in benzene will be (K for benzene – 5.12 K kg mol-‘)
Q.2.Tertiary butane gets oxidized with oxidizing agents like alkaline KMnO4 to
B) Ter-butyl alcohol
C) Secondary-propyl alcohol
D) All of above
A) Number of moles of solute present in 1L of solution
B) Number of moles of solute present in 100mL of solution
C) Number of moles of solute present in 1 kg of solvent
D) Number of gram Eq. of solute present in 1L of solution
Q.4.An element belongs to period 2 and group 2 the number of valence electrons in the atoms of this element is
Q.5.Acetaldehyde and benzaldehyde can be distinguished chemically by
A) Benedict’s test
B) Tollen’s reagent test
C) Fehling’s solution test
D) None of above
Q.6.Fog is a solution of
A) Air in water vapors
B) Air in air
C) Vapors in vapors
D) Water vapors in air
Q.7.The formula for quicklime is
Q.8.The metallurgical process in which a metal is obtained in a fused state is called
D) Froth floatation
Q.9.Which one of the following metals doesnot form amalgams?
Q.10.Which of the following is the wrong statement?
A) ONCI and ONO are isoelectronic
B) O3 molecule is bent
C) Ozone is violet – black in solid state
D) Ozone is diamagnetic gas
Q.11.The Latin word formica means ant. The name formic acid is derived from this Latin word because
A) This acid, in ancient times, was used to eliminate ant-hills
B) This corrosive acid is secreted by ants to drive away their enemies
C) This acid was first obtained by the distillation of ants
D) Ants are attracted by the odour of this acid
Q.12.The gas used in the manufacture of vanaspati from vegetable oil is
D) Carbon dioxide
Q.13.Horizontal rows in the periodic table are called
B) Group 14
D) Period 14
Q.14.What is atomic number of an atom?
A) Number of protons
B) Number of neutrons
C) Number of electrons
D) Total number of protons and neutrons
Q.15.Lons are charged particles that form when atoms
A) Lose or gains protons
B) Lose or gains electrons
C) Lose or gains neutrons
D) None of the above
Q.16.Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be
A) 2: 16:2
B) 2: 16:1
Q.17.How many litres of water must be added to 1 litre of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?
A) 0.1 L
Q.18.Which among the following is the most reactive?
Q.19.What is Calcium sulphate?
A) Epsom salt
B) Blue vitriol
C) Gypsum salt
D) Potash alum
Q.20.Brass is an alloy of?
A) Copper and Tin
B) Copper and Zinc
C) Copper and Aluminium
D) Iron and Copper
Q.21.What is metallurgy ?
A) Process of extracting metal in pure form from its ore.
B) Process of creating alloys of metals.
C) Process of making metals live long.
D) None of above.
Q.22.Zone refining is used for the purification of
Q.23.Which among the following gives hissing sound when dissolved into H2O?
Q.24. A Cyclotron is__?
A) A charged particle
B) A particle Accelerator
C) A magnetic particle
D) A radioactive particle
Q.25.The atomic weight of Chlorine is 35. It consists of _____?
A) 17 Protons + 18 Neutrons
B) 17 Neutrons + 18 protons
C) 17 Neutrons + 17 Protons + 1 electron
D) None of the above