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Some basic concepts OF Chemistry

189 Questions Start Errorless Test
All Exams Errorless
EAMCET 2009 Q76 Errorless Chemical Stoichiometry MCQ
How many ā€˜mLā€™ of perhydrol is required to produce sufficient oxygen which can be used to completely convert 2L of $SO_{2}$ gas to $SO_{3}$ gas
A.
10 mL
B.
5 mL
C.
20 mL
D.
30 mL
Kerala PET 2008 Q77 Errorless Atomic, Molecular and Equivalent Masses MCQ
The percentage of an element $M$ is 53 in its oxide of molecular formula $M_2O_3$ . Its atomic mass is about
A.
45
B.
9
C.
18
D.
36
E.
27
Kerala PMT 2008 Q78 Errorless Atomic, Molecular and Equivalent Masses MCQ
A metal M of equivalent mass E forms an oxide of molecular formula $M_{x}O_{y}$ . The atomic mass of the metal is given by the correct equation
A.
$2E(y/x)$
B.
xyE
C.
E/y
D.
y/E
E.
$E/2(x/y)$
MP PMT 2008; WB JEE 2010 Q79 Errorless Atomic, Molecular and Equivalent Masses MCQ
In the reaction of sodium thiosulphate with $I_{2}$ in aqueous medium the equivalent weight of sodium thiosulphate is equal to
A.
Molar mass of sodium thiosulphate
B.
The average of molar masses of $Na_{2}S_{2}O_{3}$ and $I_{2}$
C.
Half the molar mass of sodium thiosulphate
D.
Molar mass of sodium thiosulphate Ɨ 2
CBSE PMT 2008 Q80 Errorless The Mole Concept MCQ
How many moles of lead (II) chloride will be formed from a reaction between 6.5g of PbO and 3.2g of HCl
A.
0.011
B.
0.029
C.
0.044
D.
0.333
MP PMT 2008 Q81 Errorless The Mole Concept MCQ
The rest mass of 1 mol of neutrons $(Mn = 1.675 \times 10^{-27} kg)$ is
A.
$1.800 \times 10^{-3} kg$
B.
$1.008 \times 10^{-4} kg$
C.
$1.080 \times 10^{-3} kg$
D.
$1.008 \times 10^{-3} kg$
VITEEE 2008 Q82 Errorless The Mole Concept MCQ
The number of formula units of calcium fluoride $CaF_{2}$ present in 146.4 g of $CaF_{2}$ (The molar mass of $CaF_{2}$ is 78.08 g/mol) is
A.
$1.129 \times 10^{24}CaF_{2}$
B.
$1.146 \times 10^{24}CaF_{2}$
C.
$7.808 \times 10^{24}CaF_{2}$
D.
$1.877 \times 10^{24}CaF_{2}$
KCET 2008 Q83 Errorless The Mole Concept MCQ
Mass of 0.1 mole of methane is
A.
$1.6g$
B.
$0.1g$
C.
$1g$
D.
$16g$
WB JEE 2008 Q84 Errorless The Mole Concept MCQ
Sodium nitrate on reduction with Zn in presence of NaOH solution produces $NH_{3}$ . Mass of sodium nitrate absorbing 1 mole of electron will be
A.
7.750
B.
10.625
C.
8.000
D.
9.875
WB JEE 2008 Q85 Errorless The Mole Concept MCQ
1 mole of methyl amine on reaction with nitrous acid gives at N.T.P
A.
1.0 Litre of nitrogen
B.
22.4 Litre of nitrogen
C.
11.2 Litre of nitrogen
D.
5.6 Litre of nitrogen
AIIMS 2008 Q86 Errorless Chemical Stoichiometry MCQ
During electrolysis of water the volume of $O_{2}$ liberated is $2.24dm^{3}$ . The volume of hydrogen liberated, under same conditions will be
A.
$2.24dm^{3}$
B.
$1.12dm^{3}$
C.
$4.48dm^{3}$
D.
$0.56dm^{3}$
MP PMT 2008 Q87 Errorless Chemical Stoichiometry MCQ
1 g of a mixture of $NaHCO_{3}$ and $Na_{2}CO_{3}$ is heated to $150^{\circ}C$ . The volume of the $CO_{2}$ produced at STP is 112.0 mL. Calculate the percentage of $Na_{2}CO_{3}$ in the mixture (Na = 23, C = 12, O = 16)
A.
20
B.
46
C.
84
D.
16
KCET 2008 Q88 Errorless Chemical Stoichiometry MCQ
For the reaction $Fe_{2}O_{3} + 3CO \rightarrow 2Fe + 3CO_{2}$ , the volume of carbon monoxide required to reduce one mole of ferric oxide is
A.
$67.2 dm^{2}$
B.
$11.2 dm^{3}$
C.
$22.4 dm^{3}$
D.
$44.8 dm^{3}$
CPMT 2007 Q89 Errorless Chemical Stoichiometry MCQ
What is the stoichiometric coefficient of Ca in the reaction $Ca + Al^{3+} \rightarrow Ca^{2+} + Al$
A.
2
B.
1
C.
3
D.
4
AIEEE 2007 Q90 Errorless Chemical Stoichiometry MCQ
In the reaction. $2Al_{(s)} + 6HCl_{(s)} \rightarrow 2Al^{3+}_{(aq)} + 6Cl_{(aq)}^{-} + 3H_{2(g)}$
A.
$6L HCl_{(aq)}$ is consumed for every $3L H_{2(g)}$ produced
B.
$33.6L H_{2(g)}$ is produced regardless of temperature and pressure for every mole Al that reacts
C.
$67.2L H_{2(g)}$ at STP is produced for every mole Al that reacts
D.
$11.2H_{2(g)}$ at STP is produced for every mole $HCl_{(aq)}$ consumed
IIT JEE 2007 Q91 Errorless Critical Thinking MCQ
Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate is
A.
3
B.
4
C.
5
D.
6
AFMC 2006 Q92 Errorless Atomic, Molecular and Equivalent Masses MCQ
The number of moles of oxygen obtained by the electrolytic decomposition of 108 g water is
A.
2.5
B.
3
C.
5
D.
7.5
CPMT 2006 Q93 Errorless The Mole Concept MCQ
Number of atoms of He in 100 amu of He (atomic wt. of He is 4) are
A.
25
B.
100
C.
50
D.
$100 \times 6 \times 10^{-23}$
DCE 2006 Q94 Errorless The Mole Concept MCQ
The number of g-atom of oxygen in $6.02 \times 10^{24} CO$ molecule is
A.
1
B.
0.5
C.
5
D.
10
RPMT 2006; CBSE PMT 2008 Q95 Errorless Chemical Stoichiometry MCQ
What volume of oxygen gas $(O_{2})$ measured at $0^{\circ}C$ and 1 atm, is needed to burn completely 1L of propane gas $(C_{3}H_{8})$ measured under the same conditions
A.
5 L
B.
10 L
C.
7 L
D.
6 L
J & K CET 2006 Q96 Errorless Chemical Stoichiometry MCQ
5 litres of a solution contains 25 mg of $CaCO_{3}$ . What is its concentration in ppm (mol. wt. of $CaCO_{3}$ is 100)
A.
25
B.
1
C.
5
D.
2500
DCE 2006 Q97 Errorless Chemical Stoichiometry MCQ
In the reaction, $4NH_{3}(g)+5O_{2}(g)\rightarrow4NO(g)+6H_{2}O(g)$ , When 1 mole of ammonia and 1 mole of $O_{2}$ are made to react to completion
A.
1.0 mole of $H_{2}O$ is produced
B.
1.0 mole of NO will be produced
C.
All the oxygen will be consumed
D.
All the ammonia will be consumed
KCET 2006 Q98 Errorless Chemical Stoichiometry MCQ
The decomposition of a certain mass of $CaCO_{3}$ gave 11.2 $dm^{3}$ of $CO_{2}$ gas at STP. The mass of KOH required to completely neutralise the gas is
A.
56 g
B.
28 g
C.
42 g
D.
20 g
AIEEE 2005 Q99 Errorless Atomic, Molecular and Equivalent Masses MCQ
If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will
A.
Decrease twice
B.
Increase two fold
C.
Remain unchanged
D.
Be a function of the molecular mass of the substance
BHU 2004 Q100 Errorless Matter and Units for Measurement MCQ
The significant figures in 34.00 are
A.
2
B.
5
C.
6
D.
4