19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The largest number of molecules is in
Rearrange the following I to IV in order of increasing masses and choose the correct answer [At. wt. of N = 14 u, O = 16 u, Cu = 63 u] I 1 molecule of oxygen II 1 atom of nitrogen III 1 × 10–10mol molecule of oxygen…
Which among the following is the heaviest?
If 1 12 moles of oxygen combine with Al to form Al2O3, the weight of Al used in the reaction is (Al = 27)
Which of the following contains atoms equal to those in 12 g Mg ? (At. wt. Mg = 24)
Which of the following represents 180 g of water correctly? (I) 5 moles of water. (II) 10 moles of water. (III) 6.023 × 1023 molecules of water. (IV) 6.023 × 1024 molecules of water. Choose the correct option.
The mass of 112 cm3 of CH4 gas at STP is
The number of molecules in 89.6 litre of a gas at NTP are :
Number of molecules in 1 litre of oxygen at STP is : (a) 6.02×10 (b) 6.02×10 22.4
M g of a substance when vaporised occupy a volume of 5.6 litre at NTP. The molecular mass of the substance will be :
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?
Heating with carbon in absence of air is known as :
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with (NEET 2016)
Which one is malachite from the following? (NEET 2015) (a) 2 Cu OH (b) Fe O (c) CuCO .Cu OH (d) CuFeS
Identify the incorrect statement. (NEET Odisha 2015)
The ore of aluminium is (UP CPMT 2013)