19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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 …
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.
How many significant figures does 63180 have?
_________is referred to as the closeness of different measurements for the same quantity.
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?
Which of the following statements(s) is false about the arrangement of particles, in different states of matter?
How many significant figures are present in 0.10100 × 103?
Which of the following is the most accurate measurement?
What mass of 95% pure CaCO₃ will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reaction? CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + 2H₂O(l) [Calculate upto second place of decimal po…
Out of the following metals that cannot be obtained by electrolysis of the aqueous solution of their salts is
The main function of roasting is
Which of the following changes take place during roasting?
Which one of the following reactions represents a calcination reaction?
By which of the following processes is an oxide ore reduced to the free metal?
A flux is often added to remove impurities from an ore in a blast furnace. In the reaction CaO + SiO₂ → CaSiO₃ the slag and the flux are
Which one of the following is not a basic flux?
Which of the following benefaction processes is used for the mineral, Al₂O₃.2H₂O?
Which of the following statements is correct?
An element whose electronic configuration is 4s13d10. The possibility of element is
Identify the correct statement from the following: (NEET 2020)