13
An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is : [Atomic wt. of C is 12, H is 1]
14
Which one of the following has maximum number of atoms?
15
The number of protons, neutrons and electrons in 17571Lu, respectively, are :
16
The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s
process is :
17
A mixture of 2.3 g formic acid and 4.5 g oxalic
acid is treated with conc. H2SO4
. The evolved
gaseous mixture is passed through KOH
pellets. Weight (in g) of the remaining product
at STP will be
18
In which case is number of molecules of water
maximum?
19
Which of the following is dependent on temperature?
20
Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. When 0.1 mole of XY2 weights 10 g and 0.05 mole of X3Y2 weighs 9 g, the atomic weights of X and Y are
21
What is the mass of the precipitate formed when 50 mL of 16.9% solution of AgNO3 is mixed with 50 mL of 5.8% NaCl solution ? (Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 35.5
22
What is the mole fraction of the solute in a 1.00 m aqueous solution?
23
The number of water molecules is maximum in
24
If Avogadro number NA, is changed from 6.022 $$ \times $$ 1023 mol$$-$$1 to 6.022 $$ \times $$ 1020 mol$$-$$1, this would change
25
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 ?
AIPMT 2015 Cancelled Paper
26
1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel, Which reactant is left in excess and how much ? (At. wt. Mg = 24, O = 16)
27
When 22.4 liters of H2(g) is mixed with 11.2 litres of Cl2(g), each at S.T.P. the moles of HCl(g) formed is equal to
28
Equal masses of H2, O2 and methane have been taken in a container of volume V at temperature 27oC in identical conditions. The ratio of the volumes of gases H2 : O2 : methane would be
29
In an experiment it showed that 10 mL of 0.05 M solution of chloride required 10 mL of 0.1 M solution of AgNO3, which of the following will be the formula of the chloriode (X stands for the symbol of the element other than chlorine)
30
6.02 $$ \times $$ 1020 molecules of urea present in 100 mL of its solution. The concentration of solution is
31
How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3? The concentrated acid is 70% HNO3.
32
Which has the maximum number of molecules among the following ?
33
25.3 g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na+ and carbonate ions, CO$${}_3^{2 - }$$ are respectively (Molar mass of Na2CO3 = 106 g mol$$-$$1)
34
The number of atoms in 0.1 mol of a triatomic gas is (NA = 6.02 $$ \times $$ 1023 mol$$-$$1)
35
10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be
36
What volume of oxygen gas (O2) measuread at 0oC and 1 atm, is needed to burn completely 1 L of propane gas (C3H8) measured under the same conditions ?
37
An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be
38
How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g HCl ?
39
Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g mL$$-$$1. Volume of acid required to make one litre of 0.1 M H2SO4 solution is
40
An element, X has the following isotopic composition:
200X : 90% 199X : 8.0% 202X : 2.0%
The weighted average atomic mass of the naturally occuring element X is closest to
41
The mole fraction of the solute in one molal aqueous solution is
42
The maximum number of molecules is present in
43
2.5 litre of 1 M NaOH solution is mixed with another 3 litre of 0.5 M NaOH solution. Then find out molarity of resultant solution.
44
The percentage of C, H and N in an organic compound are 40%, 13.3% and 46.7% respectively then empirical formula is
45
Which has maximum molecules?
46
Specific volume of cylinfrical virus particle is 6.02 $$ \times $$ 10$$-$$2 cc/g whose radius and length are 7 $$\mathop A\limits^ \circ $$ and 10 $$\mathop A\limits^ \circ $$ respectively. If NA = 6.02 $$ \times $$ 1023, find molecular weight of virus.
47
Molarity of liquid HCl, if density of solution is 1.17 g/ce is
48
Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt. = 78.4) then minimum molecular weight of peroxide anhydrous enzyme is
49
Oxidation numbers of A, B, C are + 2, +5 and $$-$$2 respectively. Possible formula of compound is
50
Volume of CO2 obtained by the complete decomposition of 9.85 g of BaCO3 is