All questions
- Explain Formula mass with an example. The formula mass of a molecule (also known as formula weight) is the sum of the atomic weights of the atoms in the empirical formula of the... 1
- Explain : Molar volume of gas. One mole of any gas occupies a volume of 22.4 dm³ at standard temperature (0^o C) and pressure (1 atm) (STP). The volume of 22.4 dm3 at STP... 1
- F. Types of matter (on the basis of chemical composition). On the basis of composition, matter can be classified as compound, element and mixture. Solids, liquids and gases are physical states of mat... 2
- State the law of multiple proportions When two elements A and B form more than one compounds, the masses of element B that combine with a given mass of A are always in the ratio... 1
- State and explain the law of conservation of mass 'mass can neither be created nor destroyed' this law is know as law of conservation of mass . Antoine Lavoisier carefully performed many com... 1
- What is meant by molar volume of a gas ? One mole of any gas occupies a volume of 22.4 dm3 at standard temperature (0^o C) and pressure (1 atm) (STP). The volume of 22.4 dm³ at STP... 1
- What is the SI unit of amount of a substance ? Answer: The SI unit of amount of substance is the mole (symbol: mol). The mole is one of the seven SI base units. One mole is the amount of... 1
- How many particles are present in 1 mole of a substance ? The number of particles present in 1 mole is 6.022 × 10²³ It is Avogadro's number equal to 6.022×10²³ and is expressed as the symbol N_A. 1
- Calculate the molecular mass of the following in u. a. NH3 b. CH3 COOH c. C2 H5 OH A) NH_(3 ) _(molecular mass of )NH_(3 =(1 × atomic space mass space of space N ) ) + (3× atomic mass of H) =(1×14 u)+(3× 1u) =17 u B) CH_(3... 1
- How many grams does an atom of hydrogen weigh ? The weight of 1 atom of hydrogen is calculated as 1.66058 × 10⁻²⁴ grams. Explaination : we know that 1 molecule is made up of 6.023 ×10²³ at... 2
- Point out the difference between 12 g of carbon and 12 u of carbon 12 g of carbon is the molar mass of carbon and 12 u of carbon is the mass of one carbon atom since , 1u= 1 atomic mass unit =1.661 × 10⁻²⁷ k... 1
- A. State and explain Avogadro's law. In 1811, Avogadro proposed that equal volumes of all gases at the same temperature and pressure contain equal number of molecules According... 1
- 1. Choose the most correct option A sample of pure water, whatever the source always contains The answer is highlighted in question like this correct answer Answers ) Q1. Choose the most correct option A) a. 88.9 B) d. Na₂S, NaF C) a.... 1
- Formation of real image using a biconvex lens is shown below If the whole set up is immersed in water without disturbing the object and the The correct option is image disappers Explainnation :: from space 1over f=(μ_rel-1)(1over R₁-1over R₂) Focal length of lens will change henc... 1
- A load of mass M kg is suspended from a steel wire of length 2m and radius 1.0mm in Searle's apparatus The correct answer is option B) 3.00 mm Explaination :: 1
- The image of an object, formed by a plano-convex lens at a distance of 8m behind the lens, is real and is one third the size of the object. Correct option is d) 3m Explaination:: μ =λ₀over λ_m=3over2 1over f=(μ-1)over R=1over 2R 1over f=1over V-1over u 1over8-(1over24)=1over2R 3+... 1
- An electromagnetic wave can be produced, when charge is Amoving with a constant velocity Correct option is D) both B and C An accelerated charge is the source of electromagnetic waves (EMWs). When the charge is in a circular moti... 1
- A gas mixture consists of 3 moles of oxygen and 5 moles of argon at temperature T. The correct answer is (1) 15 Explanation:: 1
- The radius in kilometre to which the present radius of earth (R = 6400 km) to be compressed so that the escape velocity is increased 10 times is ____________ 64 km solution:: Escape velocity = √(2GMover R) we know mass remain unchanged V_e' over V_e = √(R_eover R_e') 10Vover eover Vover e =√(6400o... 1
- A Carnot's engine working between 400 K and 800 K has a work output of 1200 J per cycle. (2) 2400 J Explaination:: Wover Q_in=1-T₂over T₁=1-1over2=1over2 1200over Q_in=1over2 Q_in=2400 J 1
- A polyatomic ideal gas has 24 vibrational modes. What is the value of gamma ? (2) 1.03 is the correct option Explaination :: f= 3+3 +24 (vibrational modes) =30 γ = 1+2over30=16over15 γ=1.067 2
- Which level of the single ionized carbon has the same energy as the ground state energy of hydrogen atom ? Correct answer is option (1) 6 2
- The output of the given combination gates represents : 2) Nand gate is the correct answer 1
- For what value of displacement the kinetic energy and potential of a simple harmonic oscillation become equal ? The correct option is (3) x= ±Aoversqrt2 Explaination:: potential energy = 1over2kx²=1over2mω²( x²) Kinetic energy = 1over2m(ω√( A²-x²))² As... 1