|
1.375gof cupric oxide was reduced by heating in a current
|
|
1
|
4947
|
December 17, 2016
|
|
If ten volume of dihydrogen gas react with five volume of dioxygen gas
|
|
1
|
1487
|
December 17, 2016
|
|
Express each of the following in SI units
|
|
1
|
4404
|
December 17, 2016
|
|
The water level in a metric measuring cup is 0.75 L
|
|
1
|
593
|
December 17, 2016
|
|
Round up the following up to three significant figures
|
|
1
|
1636
|
December 17, 2016
|
|
Calculate the pressure in pascal
|
|
1
|
565
|
December 17, 2016
|
|
Match the following with their multiples
|
|
1
|
982
|
December 17, 2016
|
|
If 4 g of NaOH dissolves in 36g of ${{H}_{2}}$O, calculate the mole fraction of each component in die solution
|
|
1
|
1105
|
August 9, 2016
|
|
Explain the use of limiting and excess reagents in a chemical reaction
|
|
0
|
925
|
August 9, 2016
|
|
If the density of methanol is 0.793 kg ${{L}^{-1}}$. What is its volume needed "for making 2.5 L of its 0.25 M solution?
|
|
0
|
2381
|
August 9, 2016
|
|
A sample of NaN${{O}_{3}}$ weighing 0.38 g is placed in 50 mL volumetric flask
|
|
1
|
515
|
August 9, 2016
|
|
Calculate the mass percentage of carbon, hydrogen and oxygen in ethanol
|
|
0
|
11068
|
August 9, 2016
|
|
A solution is prepared by adding of 2 g of a substance A in 18 g of water. Calculate the mass percentage of the solute
|
|
0
|
2028
|
August 9, 2016
|
|
The density of 3 M solution of NaCl is 1.25 g m${{L}^{-1}}$ Calculate molatity of the solution
|
|
0
|
1733
|
August 9, 2016
|
|
What do you understand by a limiting reactant?
|
|
0
|
847
|
August 9, 2016
|
|
Calculate the number of moles of NaOH in 27 $c{{m}^{3}}$ of 0.15 M NaOH solution
|
|
0
|
1079
|
August 9, 2016
|
|
In 96.0 gm of sulphur calculate
|
|
1
|
1319
|
August 9, 2016
|
|
A welding fuel gas contains carbon and hydrogen only
|
|
1
|
3307
|
August 9, 2016
|
|
Chlorine is prepared in the laboratory by treating manganese dioxide (Mn${{O}_{2}}$) with aqueous hydrochloric acid according to the reaction :
|
|
0
|
1770
|
August 9, 2016
|
|
In what way study of chemistry will be helpful for the following :
|
|
1
|
718
|
August 9, 2016
|
|
Calculate the molecular mass of the following :
|
|
1
|
2811
|
August 9, 2016
|
|
Convert the following into basic units:
|
|
0
|
912
|
August 9, 2016
|
|
Dinitrogen and dihydrogen react with each other to produce ammonia according to the following chemical equation:
|
|
1
|
10007
|
August 9, 2016
|
|
The following data are obtained when dinitrogen and dioxygen react together to form different compounds:
|
|
1
|
1548
|
August 9, 2016
|
|
Calculate the number of atoms in each of the following:
|
|
1
|
4978
|
August 9, 2016
|
|
A crystalline salt on being rendered anhydrous loses 45.6% of its weight
|
|
1
|
18997
|
August 9, 2016
|
|
In three moles of ethane ($C_{2}H_{6}$) calculate the following :
|
|
1
|
622
|
August 9, 2016
|
|
Calculate the amount of C${{O}_{2}}$ that could be produced when:
|
|
1
|
2694
|
August 9, 2016
|
|
Calculate the mass percent of different elements present in sodium sulphate ($N{{a}_{2}}S{{O}_{4}}$)
|
|
0
|
4495
|
August 9, 2016
|
|
Balance the following equation :
|
|
0
|
1776
|
August 9, 2016
|