19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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?
Which of the following statements(s) is false about the arrangement of particles, in different states of matter?
A standard solution of 0.165 M HCl is being used to determine the concentration of an unknown NaOH solution. If 25.5 mL of an acid solution are required to neutralize 15.0 mL of the base, what is the mo…
Molarity equation of a mixture of solutions of same substance is given by (a) M V M V M V ... M M M x x x x (b) M V M V M V ... M V V V (c) M M M ... M V V V V V V (d) M M M ... M V V V V V V x x Ans. (b) Sol. Molarit…
The density of a solution prepared by dissolving 120g of urea (mol. mass = 60 u) in 1000 g of water is 1.15g/mL. The molarity of this solution is
Mole fraction of ethanol in ethanol - water mixture is 0.25. Hence, percentage concentration of ethanol (C₂H₆O) by weight of mixture is
What is the weight % sulphuric acid in an aqueous solution which is 0.502 M in sulphuric acid? The specify gravity of the solution is 1.07
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)