NEET-UG SERIES Chemistry
Some Basic Concepts Of Chemistry
38 previous year questions.
Volume: 38 Ques
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1996 Chapter Questions 38 MCQs
01
PYQ 1988
medium
chemistry ID: neet-ug-
At STP, the density of vapour in g/L will be nearest to
1
6.87
2
3.42
3
10.26
4
4.57
02
PYQ 1988
medium
chemistry ID: neet-ug-
1 cc at NTP contains
1
2
3
4
All of the above
03
PYQ 1988
medium
chemistry ID: neet-ug-
One litre hard water contains 12.00 mg . Milliequivalents of washing soda required to remove its hardness is
1
1
2
12.16
3
4
04
PYQ 1989
medium
chemistry ID: neet-ug-
A metal oxide has the formula . It can be reduced by to give free metal and water. of required 6 mg of for complete reduction. The atomic mass of the metal is
1
2
3
4
05
PYQ 1989
easy
chemistry ID: neet-ug-
The number of oxygen atoms in of is,
1
2
3
4
06
PYQ 1990
medium
chemistry ID: neet-ug-
Boron has two stable isotopes, and . Calculate average atomic weight of boron in the periodic table.
1
10.8
2
10.2
3
11.2
4
10
07
PYQ 1991
medium
chemistry ID: neet-ug-
A molar solution of is diluted from 1 litre to a volume of 10 litres, the normality of the solution will be
1
1 N
2
0.1 N
3
5 N
4
0.5 N
08
PYQ 1994
medium
chemistry ID: neet-ug-
The total number of valence electrons in 4.2 g of ion is [ is the Avogadro's number)
1
2
3
4
09
PYQ 1996
medium
chemistry ID: neet-ug-
0.24 g of a volatile gas, upon vaporisation, gives 45 mL vapour at NTP. What will be the vapour density of the substance ? (Density of )
1
95.93
2
59.93
3
95.39
4
5.993
10
PYQ 1998
medium
chemistry ID: neet-ug-
Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200 g. The number of iron atoms (at. weight of Fe is 56) present in one molecule of haemoglobin are
1
1
2
6
3
4
4
2
11
PYQ 1998
medium
chemistry ID: neet-ug-
In the reaction, When 1 mole of ammonia and 1 mole of are made to react to completion, then
1
1.0 mole of is produced
2
1.0 mole of NO will be produced
3
all the oxygen will be consumed
4
all the ammonia will be consumed
12
PYQ 1999
easy
chemistry ID: neet-ug-
The number of atoms in 4.25 g of is approximately
1
2
3
4
13
PYQ 2000
medium
chemistry ID: neet-ug-
Which pair have not equal dimensions:
1
Energy and torque
2
Force and impulse
3
Angular momentum and Plank's constant
4
Elastic modulus and pressure
14
PYQ 2000
medium
chemistry ID: neet-ug-
Assuming fully decomposed, the volume of released at STP on heating 9.85 g of (at. mass of Ba = 137) will be
1
1.12 L
2
0.84 L
3
2.24 L
4
4.96 L
15
PYQ 2000
medium
chemistry ID: neet-ug-
Volume of obtained by the complete decomposition of is:
1
2
3
4
16
PYQ 2000
easy
chemistry ID: neet-ug-
A compound contains atoms of three elements and . If the oxidation number of is is and that of is , the possible formula of the compound is
1
2
3
4
17
PYQ 2001
easy
chemistry ID: neet-ug-
Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt = 78.4) then minimum molecular weight of peroxidase anhydrous enzymes is
1
1.568 × 10^4
2
1.568 × 10^3
3
15.68
4
2.136 × 104
18
PYQ 2001
medium
chemistry ID: neet-ug-
Which one correctly matched
1
Vit. E – Tocoferole
2
Vit. D – Riboflavin
3
Vit. B – Calciferole
4
Vit. A – Thiamine
19
PYQ 2001
medium
chemistry ID: neet-ug-
Sp. vol. of cylinderical virus particle is 6.02 × 10^-2 cc/gm. Whose radius and length are 7 Å & 10Å respectively. If NA = 6.02 × 10^23. Find mol. wt. of virus
1
1.54 kg/mol
2
1.54 × 10^4 kg/mol.
3
3.08 × 10^4 kg/mol.
4
3.08 × 10^3kg/mol.
20
PYQ 2002
medium
chemistry ID: neet-ug-
The percentage of C, H and N in an organic compound are 40%, 13.3% and 46.7% respectively then emprirical formula is
1
C3H13N3
2
CH2N
3
CH4N
4
CH6N
21
PYQ 2002
medium
chemistry ID: neet-ug-
Which has maximum number of molecules :-
1
2
3
4
22
PYQ 2005
medium
chemistry ID: neet-ug-
The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270kg of aluminum metal from bauxite by the Hall process is: (Atomic mass Al = 27)
1
180 kg
2
120 kg
3
360 kg
4
90 kg
23
PYQ 2007
easy
chemistry ID: neet-ug-
An element, has the following isotopic composition; The weighted average atomic mass of the naturally-occurring element is closest to:
1
201 amu
2
202 amu
3
199 amu
4
200 amu
24
PYQ 2008
medium
chemistry ID: neet-ug-
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
1
2
3
CHO
4
25
PYQ 2008
easy
chemistry ID: neet-ug-
What volume of oxygen gas measured at and 1 atm, is needed to bum completely 1L of propane gas measured under the same conditions?
1
7 L
2
6 L
3
5 L
4
10 L
26
PYQ 2008
easy
chemistry ID: neet-ug-
How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl?
1
0.339
2
0.011
3
0.029
4
0.044
27
PYQ 2010
easy
chemistry ID: neet-ug-
of sodium carbonate, is dissolved in enough water to make of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, and carbonate ions, are respectively (Molar mass of )
1
0.477 M and 0.477 M
2
0.955 M and 1.910 M
3
1.910 M and 0.955 M
4
1.90 M and 1.910 M
28
PYQ 2013
easy
chemistry ID: neet-ug-
molecules of urea are present in 100 mL of its solution. The concentration of solution is :-
1
0.1 M
2
0.02 M
3
0.01 M
4
0.001 M
29
PYQ 2014
medium
chemistry ID: neet-ug-
In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 gm of sample neutralized 10 mL of 1 M H2SO4, The percentage of nitrogen in the soil is:
1
45.33
2
35.33
3
43.33
4
37.33
30
PYQ 2014
hard
chemistry ID: neet-ug-
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)
1
Mg, 0.16 g
2
O2, 0.16 g
3
Mg, 0.44 g
4
O2, 0.28 g
31
PYQ 2014
medium
chemistry ID: neet-ug-
When 22.4 L of is mixed with 11.2 L of , each at STP, the moles of formed is equal to
1
1 mole of
2
2 moles of
3
0.5 mole of
4
1.5 moles of
32
PYQ 2015
easy
chemistry ID: neet-ug-
The number of water molecules is maximum in :
1
18 gram of water
2
18 moles of water
3
18 molecules of water
4
1.8 gram of water
33
PYQ 2015
medium
chemistry ID: neet-ug-
If avogadro number , is changed from to , this would change :
1
the ratio of chemical species to each other in a balanced equation
2
the ratio of elements to each other in a compound
3
the definition of mass in units of grams
4
the mass of one mole of carbon
34
PYQ 2015
medium
chemistry ID: neet-ug-
A mixture of gases contains and gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture?
1
16 : 1
2
2 : 1
3
1 : 4
4
4 : 1
35
PYQ 2015
medium
chemistry ID: neet-ug-
What is the mass of the precipitate formed when 50 mL of 16.9% solution of is mixed with 50 mL of 5.8% solution ? (Ag = 107.8, N = 14, O = 16, Na = 23, Cl =35.5)
1
7 g
2
14 g
3
28 g
4
3.5 g
36
PYQ 2018
medium
chemistry ID: neet-ug-
A mixture of formic acid and oxalic acid is treated with cone. . The evolved gaseous mixture is passed through pellets. Weight (in ) of the remaining product at will be
1
4.4
2
1.4
3
2.8
4
3
37
PYQ 2018
medium
chemistry ID: neet-ug-
In which case is the number of molecules of water maximum ?
1
mol of water
2
18 mL of water
3
0.00224 L of water vapours at 1 atm and 273 K
4
0.18 g of water
38
PYQ 2024
hard
chemistry ID: neet-ug-
A compound X contains 32% of A, 20% of B and remaining percentage of C. Then, the empirical formula of X is:
(Given atomic masses of A=64; B=40; C=32 u)
(Given atomic masses of A=64; B=40; C=32 u)
1
A2BC2
2
ABC3
3
AB2C2
4
ABC4