19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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?
_________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?
How many significant figures does 63180 have?
1.0 g of magnesium is burnt with 0.56 g O₂ in a closed vessel. Which reactant is left in excess and how much? (At. wt. Mg = 24, O = 16) (NEET 2014)
When 22.4 litres of H₂(g) is mixed with 11.2 litres of Cl₂(g), each at STP, the moles of HCl(g) formed is equal to (NEET 2014)
The amount of solute in moles per unit volume is_______.
An organic compound has an empirical formula CH O . It’s vapour density is 45. The molecular formula of the compound is
The empirical formula of a compound is CH₂. One mole of this compound has a mass of 42 g. Its molecular formula is
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…
An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of C is 12, H is 1] (NEET 2021)
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?
The impurities present in a mineral are called
Which of the following statements is correct?
An element whose electronic configuration is 4s13d10. The possibility of element is