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Recent questions tagged Some basic concepts of chemistry
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Define the law of multiple proportions. Explain it with two examples.
asked
Mar 5, 2018
in
Class XI Chemistry
by
nikita74
(
-1,017
points)
some basic concepts of chemistry
0
votes
1
answer
Calcium carbonate reacts with aqueous HC1 to give CaCl2 and C02 according to the reaction given below:
asked
Mar 5, 2018
in
Class XI Chemistry
by
nikita74
(
-1,017
points)
some basic concepts of chemistry
0
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1
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A vessel contains 1.6 g of dioxygen at STP (273.15 K, 1 atm pressure). The gas is now transferred to another vessel at constant temperature,
asked
Mar 5, 2018
in
Class XI Chemistry
by
nikita74
(
-1,017
points)
some basic concepts of chemistry
0
votes
1
answer
Assertion (A): The empirical mass of ethene is half of its molecular mass. Reason (R):
asked
Mar 5, 2018
in
Class XI Chemistry
by
nikita74
(
-1,017
points)
some basic concepts of chemistry
0
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1
answer
The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction 2A + 4B → 3C + 4D,
asked
Mar 5, 2018
in
Class XI Chemistry
by
nikita74
(
-1,017
points)
some basic concepts of chemistry
+1
vote
1
answer
If 4 g of NaOH dissolves in 36 g of H20, calculate the mole fraction of each component in the solution.
asked
Mar 5, 2018
in
Class XI Chemistry
by
nikita74
(
-1,017
points)
some basic concepts of chemistry
0
votes
2
answers
Volume of a solution changes with change in temperature, then, will the molality of the solution be affected by temperature ?
asked
Mar 5, 2018
in
Class XI Chemistry
by
nikita74
(
-1,017
points)
some basic concepts of chemistry
0
votes
1
answer
The density of 3 molal solution of NaOH is 1.110 g mL -1. Calculate the molarity of the solution.
asked
Mar 5, 2018
in
Class XI Chemistry
by
nikita74
(
-1,017
points)
some basic concepts of chemistry
0
votes
1
answer
Hydrogen gas is prepared in the laboratory by reacting dilute HC1 with granulated zinc. Following reaction takes place:
asked
Mar 5, 2018
in
Class XI Chemistry
by
rahul152
(
-2,842
points)
some basic concepts of chemistry
0
votes
1
answer
If two elements can combine to’form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in whole number ratio.
asked
Mar 5, 2018
in
Class XI Chemistry
by
rahul152
(
-2,842
points)
some basic concepts of chemistry
0
votes
1
answer
4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L of nitrous oxide was formed. The reaction is given below:
asked
Mar 5, 2018
in
Class XI Chemistry
by
rahul152
(
-2,842
points)
some basic concepts of chemistry
0
votes
1
answer
Calculate the mass per cent of calcium, phosphorus and oxygen in calcium phosphate Ca3(P04)2.
asked
Mar 5, 2018
in
Class XI Chemistry
by
rahul152
(
-2,842
points)
some basic concepts of chemistry
0
votes
2
answers
What is the difference between molality and molarity ?
asked
Mar 5, 2018
in
Class XI Chemistry
by
rahul152
(
-2,842
points)
some basic concepts of chemistry
0
votes
1
answer
What is the symbol for SI unit of mole? How is the mole defined?
asked
Mar 5, 2018
in
Class XI Chemistry
by
rahul152
(
-2,842
points)
some basic concepts of chemistry
0
votes
1
answer
How many significant figures should be present in the answer of the following calculations ? 2.5×1.25×3.5/ 2.01
asked
Mar 5, 2018
in
Class XI Chemistry
by
rahul152
(
-2,842
points)
some basic concepts of chemistry
0
votes
1
answer
What will be the mass of one atom of C-12 ingrams ?
asked
Mar 5, 2018
in
Class XI Chemistry
by
rahul152
(
-2,842
points)
some basic concepts of chemistry
0
votes
1
answer
One of the statements of Dalton’s atomic theory is given below:
asked
Mar 5, 2018
in
Class XI Chemistry
by
rahul152
(
-2,842
points)
some basic concepts of chemistry
0
votes
1
answer
Which of the following terms are unitless ?
asked
Mar 5, 2018
in
Class XI Chemistry
by
rahul152
(
-2,842
points)
some basic concepts of chemistry
0
votes
1
answer
16 g of oxygen has the same number of molecules as in
asked
Mar 5, 2018
in
Class XI Chemistry
by
rahul152
(
-2,842
points)
some basic concepts of chemistry
0
votes
1
answer
Which of the following solutions have the same concentration ?
asked
Mar 5, 2018
in
Class XI Chemistry
by
rahul152
(
-2,842
points)
some basic concepts of chemistry
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