Most Repeated MCQS in past papers of pts past papers,
>> Organic radical with general formula C n H2n+1
>> The next homologue of C 8 H18 is C 9 H20.
>> Methane is the first member of Methane is the
first member of Alkane Series.
>> The compound C 3 H8 must have All single
>> The name of C 6 H14 is Hexane.
>> NaCN is inorganic.
>> Dehydration of ethyl alcohol with conc. H2 SO 4
results in the formation of Ethene.
>> AgNO3 reagents distinguished ethene from
>> Ethene decolorizes Br2 Water.
>> Ethene reacts with HBr, the compound formed
is CH 3 -CH 2 –Br.
>> All the member of alkane series has All single
>> Baeyer’s reagent is Alkaline KMnO4.
>> Acetylene gives carboxylic acid with alkaline
>> Ethyne gives a mixture of hydrocarbons on
>> Baeyer’s test shows the presence of double and
>> Ethane is the least reactive.
>> Ethane reacts with chlorine in the presence of
>> Vitamin-K is a factor related to blood clotting.
>> The coldest region in atmosphere is
>> The freezing point of water is 0 celcius.
>> The total volume of water present on earth
surface is 1.386 Billion KM cube.
>> The vital function of protoplasm is due to the
presence of Water.
>> The quantity of fresh water present on eat is
only about 2.5%.
>> The reason of unusual physical properties of
water is due to the presence of Hydrogen
>> The density of water is one gram per centimeter
cube at 4°C.
>> The enormous quantity of water present on
earth surface acts as giant thermostat due to its
high Heat Capacity.
>> The latent heat of fusion of water is 6 KJ/Mol.
>> Dielectric constant of water at 18C o is 80.
>> Water gas is a mixture of CO & H2.
>> Chlorine act as a bleaching agent in the
presence of H2 O.
>> The chemical formula of magnetic oxide is
>> Rain water is acidic in nature because air
contain Carbon dioxide.
pts old papers
>> Nutrient pollution of water bodies is caused by
Nitrates & Phosphates.
>> Most of the aquatic animals cannot survive
>> Parkinson disease is caused by mercury.
>> The blister copper is refined by Electrolysis.
>> Chemical formula of Urea is NH2CONH2.
>> Sodium carbonate is commercially
manufactured by Solvay Process.
>> Urea is probably, most important fertilizer
>> Petroleum is a mixture of many Hydrocarbons.
>> Raw materials used for manufacturing urea are
CO2 & NH3.
>> Roasting is a step of metallurgical process.
>> Different fractions of petroleum are separated
by Fractional Distillation.
>> The blister form of copper is Impure form.
>> Vitamin A is soluble in Fat.
>> Vitamin B is soluble in Water.
>> There are 4 types of DNA.
>> Nucleic acid was first discovered in 1869.
>> Mutation is a sudden chemical change in DNA.
>> Amino acids are the building blocks of Protein.
>> Organic chemistry is the study of Carbon and its
>> Enzymes are made of Protein.
>> Cause of acidic rain is Sulphure Dioxide.