Chemistry Quiz useful for all competitive exams NEET JEE JAM SAT GATE CSIR NET TNPSC UPSC TRB etc
Chemistry Quiz useful for all competitive exams NEET JEE JAM SAT GATE CSIR NET TNPSC UPSC TRB etc What is called dry ice? CO2 SOLID
2) Name the chemical in washing soda Na2CO3.10H2O sodium carbonate decahydrate
3) What is the most abundant element on the earth crust? Oxygen
4) pH of the NaCl solution is pH = 7 Neutral
5) Addition of NaCl to ice causes Depression of Freezing point
6) Name the chemical in baking soda NaHCO3 sodium bicarbonate
7) What is the most abundant gas in the atmosphere? Nitrogen
8) What is the nature & pH of NH4Cl solution? Acidic & pH less than 7
9) Freezing mixture is NaCl (salt) + ice - 15 to -25 deg C
10) Name the chemical in Vinegar CH3COOH Acetic acid
11) What type of compound give dye test? Aromatic amine NH2 directly attached to aromatic carbon
12) pH equation of strong acid solution is pH = -log10 [H+]
13) Fullerene is an allotrope of Carbon C60
14) Name the crystal system least
13) Fullerene is an allotrope of Carbon C60
14) Name the crystal system least symmetric.Triclinic
15) Why NH4Cl a nitrogenous fertilizer makes soil acidic? NH4+ + H2O = NH4OH + H+ Hydrolysis
16) pH equation of acidic buffer solution is Henderson equation pH = pKa + log10 ([𝒔𝒂𝒍𝒕])/([𝒂𝒄𝒊𝒅])
17) pH of equimolar HCOOH and HCOONa is pH = pKa
19) Name the carboxylic acid acts as reducing agent HCOOH - Formic acid CHO functional group
20) One Einstein is E= Nhv nu ie energy of one mole of photon
21) The average life of radioactive isotope is 1/k (ie reciprocal of disintegration constant
22) Name the acid present in red ant HCOOH Formic acid
23) What compound forms Golden spangle / rain? Pb2+ I- - PbI2
24) Milk is __ type of colloid Emulsion - liquid in liquid (Fat globules in water)
What is radius of nth Bohr orbit? rn = 0.529 𝒏𝟐/𝒁 Å