19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
If 6.3g of NaHCO3 are added 15.0g CH3COOH solution, the residue is found to weigh 18.0 g. What is the mass of CO2 released in the reaction?
One of the statements of Dalton’s atomic theory in given below “Compounds are formed when atoms of different elements combine in a fixed ratio” Which of the following laws is not related to this…
In 1811, Avogadro proposed that equal volumes of gases at the same …A… and …B… should contain equal number of molecules. Here, A and B refer to
The Gay Lussac’s law was explained properly by the work of …A… in 1811. Here, A refers to
Which law states that if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of other element, are in the ratio of small whole number?
Which law states that matter can neither be created nor destroyed?
What did Dalton’s Theory couldn’t explain?
Which of the following statement is false? (I) Matter consists of indivisible atoms. (II) All the atoms of a given element have identical properties including identical mass. (III) Compounds are formed when atoms of …
…A… are formed when atoms of different elements combine in a …B… ratio. Here, A and B refer to
Assertion :Density is expressed as g mL–1 whereas specific gravity is dimension less. Reason :Specific gravity is ratio of the masses of solution and solvent.
Which of the following has the largest volume ?
How many significant figures does 63180 have?
_________is referred to as the closeness of different measurements for the same quantity.
How many significant figures are present in 0.10100 × 103?
Which of the following is the most accurate measurement?
The result of the operation 2.5 × 1.5 should be which of the following on the basis of significant figures?
2.005 has ….A…. significant figures. Here, A refers to
How can we write 232.508 in scientific notation?
Which of the following represents the largest unit?
Statement I: The temperatures in degree Celsius and degree Fahrenheit are related to each other by the following relationship. º F º C Statement II The temperature on degree Celsius and Kelvi…
Which of the following statements(s) is false about the arrangement of particles, in different states of matter?
Assertion: Lead, tin and bismuth are purified by liquation method. Reason: Lead, tin and bismuth have low m.p. as compared to impurities.
Assertion: Al2O3 is converted into Al by reduction with carbon at high temp. Reason: Carbon has greater affinity for oxygen than aluminium.
Assertion: Wrought iron is more malleable and ductile than steel. Reason: It contains slightly less percentage of carbon.
Assertion: All the ores are mineral. Reason: Ores contains metals in combined state