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At S.T.P. the density of CCl_{4} vapours in g/L will be nearest to: [1988]
One litre hard water contains 12.00 mg Mg^{2+}.Miliequivalents of washing soda required to remove its hardness is: [1988]
1 c.c. N_{2}O at NTP contains :
A metal oxide has the formula Z_{2}O_{3}. It can be reduced by hydrogen to give free metal and water. 0.1596 g of the metal oxide requires 6 mg of hydrogen for complete reduction. The atomic weight of the metal is [1989]
Ratio of C_{p} and C_{v} of a gas ‘X’ is 1.4. The number of atoms of the gas ‘X’ present in 11.2 litres of it at NTP will be [1989]
What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene?
The number of gram molecules of oxygen in 6.02 × 10^{24 }CO molecules is [1990]
The number of oxygen atoms in 4.4 g of CO_{2} is
Boron has two stable isotopes, ^{10}B (19%) and ^{11}B (81%). Average atomic weight for boron in the periodic table is [1990]
The molecular weight of O_{2} and SO_{2} are 32 and 64 respectively. At 15°C and 150 mm Hg pressure, one litre of O_{2} contains ‘N’ molecules. The number of molecules in two litres of SO_{2} under the same conditions of temperature and pressure will be : [1990]
A 5 molar solution of H_{2}SO_{4} is diluted from 1 litre to a volume of 10 litres, the normality of the solution will be : [1991]
If N_{A} is Avogadro’s number then number of valence electrons in 4.2g of nitride ions (N^{3–}) is
In the final answer of the expression
the number of significant figures is : [1994]
The weight of one molecule of a compound C _{60} H_{122} is [1995]
The percentage weight of Zn in white vitriol [ZnSO_{4}.7H_{2}O] is approximately equal to ( Zn = 65, S = 32, O = 16 and H = 1) [1995]
Liquid benzene (C_{6}H_{6}) burns in oxygen according to the equation 2C_{6}H_{6}(l ) + 15O_{2}(g) —→ 12CO_{2}(g) 6H_{2}O(g) How many litres of O_{2} at STP are needed to complete the combustion of 39 g of liquid benzene?(Mol. wt. of O_{2} = 32, C_{6}H_{6} = 78) [1996]
An organic compound containing C, H and N gave the following analysis : C = 40% ; H = 13.33% ; N = 46.67%Its empirical formula would be [1998]
The number of significant figures for the three numbers 161 cm, 0.161 cm, 0.0161 cm are[1998]
Haemoglobin contains 0.334% of iron by weight.The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (at. wt. of Fe is 56) present in one molecule of haemoglobin are [1998]
In the reaction 4 NH_{3} (g) + 5O_{2}(g) → 4NO(g) + 6H_{2}O(l) When 1 mole of ammonia and 1 mole of O_{2} are made to react to completion, [1998]
An organic compound containing C, H and O gave on analysis C – 40% and H – 6.66%. Its empirical formula would be [1999, 94]
Assuming fully decomposed, the volume of CO_{2} released at STP on heating 9.85 g of BaCO_{3} (Atomic mass, Ba = 137) will be [2000]
Specific volume of cylindrical virus particle is 6.02 × 10^{–2} cc/gm. whose radius and length 7 Å & 10 Å respectively. If NA = 6.02 × 10^{23}, find molecular weight of virus [2001]
Percentage of Se in per oxidase anhydrase enzyme is 0.5% by weight (at. wt. = 78.4) then minimum molecular weight of peroxidase anhydrase enzyme is [2001]
Which has maximum number of molecules?
172 videos309 docs152 tests

Test: Atomic & Molecular Mass (NCERT) Test  5 ques 
Test: Concentration, Empirical & Molecular Formulae Test  17 ques 
Percentage Composition, Empirical & Molecular Formula Doc  10 pages 
Stoichiometry & Limiting Reagent Video  09:55 min 
172 videos309 docs152 tests

Test: Atomic & Molecular Mass (NCERT) Test  5 ques 
Test: Concentration, Empirical & Molecular Formulae Test  17 ques 
Percentage Composition, Empirical & Molecular Formula Doc  10 pages 
Stoichiometry & Limiting Reagent Video  09:55 min 