MEDIUM
Earn 100

How many no.of glucose molecules are present in 500 ml 0.5 M solution.

Important Questions on Some Basic Concepts of Chemistry

EASY
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecules is:
HARD
In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg AgBr. What is the percentage of bromine in the compound (atomic mass of Ag=108 and atomic number of Br=80)?
MEDIUM
Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve 10ppm of iron in 100kg of wheat is ____________. (Up to two decimal place)
Atomic weight: Fe=55.85;S=32.00;O=16.00
MEDIUM
A compound with molecular mass 180 is acylated with CH3COCl to get a compound with molecular mass 390. The number of amino groups presents per molecule of the former compound is
HARD
An organic compound contains C, H and S. The minimum molecular weight of the compound containing 8% Sulphur is
MEDIUM
An unknown chlorohydrocarbon has 3.55 % of chlorine. If each molecule of the hydrocarbon has one chlorine atom only; chlorine atoms present in 1 g of chlorohydrocarbon are :(Atomic wt. of Cl=35.5 u; Avogadro constant =6.023×1023 mol1)
MEDIUM
The flocculation value of HCl for arsenic sulphide sol is 30 mmolL-1. If H2SO4 is used for the flocculation of arsenic sulphide, the amount, in grams, of H2SO4 in 250ml required for the above purpose is ________. (Round off to two digits after decimal.)
(molecular mass of H2SO4=98 g/mol
MEDIUM
A sample of a hydrate of barium chloride weighing 61 g was heated until all the water of hydration is removed. The dried sample weighed 52 g. The formula of the hydrated salt is: (atomic mass, Ba = 137 amu, Cl = 35.5 amu)
MEDIUM
A mixture of gases contains H2 and O2 gases in the ratio of 1:4 (w/w). What is the molar ratio of the two gases in the mixture?
EASY
The percentage composition of carbon by mole in methane is:
EASY
5 moles of AB2 weigh 125×10-3 kg and 10 moles of A2B2 weigh 300×10-3 kg . The molar mass of A (MA)  and molar mass of     B(MB)  in kg mol-1 are:
HARD
The ratio of mass percent of C and H of an organic compound CXHYOZ is 6 : 1. If one molecule of the above compound CXHYOZ contains half as much oxygen as required to burn one molecule of compound CXHY completely to CO2 and H2O. The empirical formula of the compound CXHYOZ is
MEDIUM
Consider the following reactions:
NaCl+K2Cr2O7+H2SO4Conc.A+ side products
A+NaOHB+ side products
B+H2SO4dilute+H2O2C+ side products
The sum of the total number of atoms in one molecule each of A,B and C is ________
EASY
Which one of the followings has maximum number of atoms?
MEDIUM
The first and second ionisation enthalpies of a metal are 496 and 4560 kJ mol-1, respectively. How many moles of HCl and H2SO4, respectively, will be needed to react completely with 1 mole of the metal hydroxide?
EASY
Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. When 0.1 mole of XY2 weighs 10 g and 0.05 mole of X3Y2 weighs 9 g, the atomic weights of X and Y are
EASY
If Avogadro number NA , is changed from 6.022×1023 mol-1 to 6.022×1020 mol-1 , this would change:
MEDIUM
The amount of sugar C12H22O11 required to prepare 2L of its 0.1 M aqueous solution is: