Some Basic Concepts of Chemistry questions
951 published questions with worked solutions.
- If 10^ 21 molecules are removed from 140 mg of N_2, then the number of moles of N_2 left is 3.34 10^X moles. The value of 'X' is...
- The amount of water needed to prepare 100 g of 10% by weight NaOH solution is ___ mol.
- When HCl gas is passed into water, it gives a solution which contains 30% HCl by mass. The density of the resultant solution is...
- The number of oxygen atoms present in 11.2 L of ozone at S.T.P. is given as Y 10^ 23 . Find 'Y'.
- According to the law of constant proportion, irrespective of the source, a pure sample of water always yields X% mass of oxygen...
- Boron has two stable isotopes, ^ 10 B (19%) and ^ 11 B (81%). The average atomic mass of boron is _______ amu.
- If the cost of 360 g of glucose (C_6H_ 12 O_6) is Rs 60, then the cost of glucose per mole is Rs____.
- The number of molecules of ammonia (NH_3) gas in a volume of 67.2 dm^3 at STP is 1.81 10^X. The value of 'X' is _____.
- 6.40 g of an unknown gas at STP occupies a volume of 4.48 dm^3. Its molar mass is___g mol^ -1 .
- The percentage composition of Cr in K_2Cr_2O_7 is _____%. (At. Mass: K=39 u; Cr=52 u; O=16u)
- Hemoglobin contains 0.3465% of iron. One molecule of hemoglobin contains 4 atoms of iron. The molecular mass of hemoglobin is...
- The atomic weight of metal M is 56 u and its oxide contains 70% of M. The number of O atoms in the empirical formula of this...
- An organic compound containing oxygen, carbon, hydrogen and nitrogen contains 20% carbon, 6.7% hydrogen and 46.67% nitrogen. Its...
- The mass of CaO produced by decomposition of 10 g CaCO_3 is ____g. (At. wt.: Ca=40; C=12; O=16 u)
- The number of sulphur atoms present in 0.1 mole of S_8 molecules is ____ 10^ 23 .
- If 5 g H_2 is mixed with 14 g of N_2 for the following reaction: N _2+3 H _2 2 NH _3. At the end, the mass of H_2 left unreacted...
- Compared to the lightest atom, the heaviest (naturally occurring) atom weighs approximately:
- The mass of one mole of electrons is:
- The present atomic weight scale is based on:
- H has two natural isotopes of _1H^1 and _1H^2, and O has two isotopes O^ 16 and O^ 18 . Which of the following molecular weights...
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