Past Papers Mcqs Flashcards
In chromatography, k stands for
Distribution coefficient
Most ideal gas at room temperature is:
Helium
Most ideal gas at room temperature from the following is:
CO2 Nh3
SO2 N2
N2
Which is an amorphous solid?
Rubber, plastic, glass etc
In liquids, intermolecular forces are:
When spectrum of hydrogen atom is taken in magnetic field, some new
lines are created. This is called;
Zeeman’s effect
Halogens on treating with silver salts of acids give
Alkyl halide
The carbon of carbonyl is
sp2 hybridized
The term aromatic was derived from
Greek word
The reaction of alcohol with SOCl2 in the presence on pyridine as catalyst gives
Alkyl halide
NaHCO3 is commonly called as
Baking soda
heating a mixture of sodium benzoate and soda lime gives
Benzene
Types of coal
Peat, lignite, anthracite, bituminous coal
Products of coal
Coal gas
Coal tar
Coke
Series starting from 57La, 42 Hf-80Hg is in the period
6th
Alkyl halides are considered to be very reactive compounds towards nucleophile
because they have an electrophilic carbon & a good leaving group
Which is the longest period of the periodic table
6th
the number of moles of solute dissolved in 1 dm3 of the solution is called
Molarity
primary alcohols and aldehydes are oxidized to form
Carboxylic acid
When white phosphorus reacts with caustic soda it yields
phosphine
What is amphoteric
Which reacts with both acids and bases
Amphoteric compounds
BeO, Al2O3,H2O
Nacl have boiling point due to
Ionic bond
To low nacl boiling point we add
CaCl2
Alkyl halides are produced from alkanes by process of
Halogenation
Formula for alkyne
CnH2n-2
Formula for alkane
CnH2n+2
Formula for alkene
CnH2n
O2 has strongest bond due to its
Double covalent nature
MgCl2 is formed due to
Metal and non metal attraction
Large surface area of reactant effect
Increase rate of reaction
Cholesterol acts as a precursor molecule in the biosynthesis of
Vitamin D
pH of O is
Neutral
Lipase enzyme is used
For the breakdown of fats not in the manufacturing of sucrose
Transition elements are commonly used as
Catalyst in reaction
No. Of distinct phases involved in rotatory kiln
6
Trace metal in insulin is
Zn
% of calcium phosphate in bone ash
50%
% by mass of Ca present in Ca(OH)2
40% approximately
Chile saltpetre has a chemical formula
NaNO3
The mineral CaSO4.H2O has the general name
Gypsum
Downs cell is used to prepare
Sodium metal
Which element is deposited at cathode during electrolysis of brine in diaphragm cell
H2
Minerals of boron
Borax, colemanite, orthoboric acid
Minerals of boron
Borax, colemanite, orthoboric acid
3rd most abundant element
Aluminum
Common minerals of aluminium
Feldspar, corundum, bauxite and cryolite
Minerals of carbon
Limestone, dolomite and magnesite
Minerals of sillicon
Feldspar, potash, mica and zircon
Commercially important compounds of sillicon and oxygen (silicates)
Sodium silicate, aluminium silicate, talc, asbestos
Methyl silicones can be used as
Lubricants and for water proofing
Tincal is a mineral of
Boron
Chief ore of aluminum is
Al2O3.2H2O
Which is not present abundantly in Earth’s crust
Sodium
Boric acid cannot be used in
Soda bottles
Chemical composition of colemanite
Ca2.B6O11.5H2O
Group 3A elements
Boron, aluminum, gallium, indium, thallium
Group 4A elements
Carbon, silicon, germanium, tin, lead
