At S.T.P. the density of CCl4 vapours in g/L will be nearest to: [1988]
One litre hard water contains 12.00 mg Mg2+.Mili-equivalents of washing soda required to remove its hardness is: [1988]
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1 c.c. N2O at NTP contains :
A metal oxide has the formula Z2O3. 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 Cp and Cv 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 × 1024 CO molecules is [1990]
The number of oxygen atoms in 4.4 g of CO2 is
Boron has two stable isotopes, 10B (19%) and 11B (81%). Average atomic weight for boron in the periodic table is [1990]
The molecular weight of O2 and SO2 are 32 and 64 respectively. At 15°C and 150 mm Hg pressure, one litre of O2 contains ‘N’ molecules. The number of molecules in two litres of SO2 under the same conditions of temperature and pressure will be : [1990]
A 5 molar solution of H2SO4 is diluted from 1 litre to a volume of 10 litres, the normality of the solution will be : [1991]
If NA is Avogadro’s number then number of valence electrons in 4.2g of nitride ions (N3–) 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 H122 is [1995]
The percentage weight of Zn in white vitriol [ZnSO4.7H2O] is approximately equal to ( Zn = 65, S = 32, O = 16 and H = 1) [1995]
Liquid benzene (C6H6) burns in oxygen according to the equation 2C6H6(l ) + 15O2(g) —→ 12CO2(g) 6H2O(g) How many litres of O2 at STP are needed to complete the combustion of 39 g of liquid benzene?(Mol. wt. of O2 = 32, C6H6 = 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 NH3 (g) + 5O2(g) → 4NO(g) + 6H2O(l) When 1 mole of ammonia and 1 mole of O2 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 CO2 released at STP on heating 9.85 g of BaCO3 (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 × 1023, 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?
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