Std-10 Most Imp Ch 1 Gseb L-19 રસાયણિક પ્રક્રિયાઑ અને સમીકરણ

The charge on a proton is +1.6 X 10(-19) C and that on an . electron is -1.6 X 10 (-19)C. Does it mean that the electron . has a charge 3.2 X 10(-19) c less than the charge of a . proton?

The heat librerated on complete combustion of 1 mole of CH_(4) gas to CO_(2)(g) and H_(2)O(l) is 890 kJ. Calculate the heat evolved by 2.4 L of CH_(4) on complete combustion.

The mean of the data 1, 2, 10, 18, 3, 17, 19, is A. 7 B. 10 C. 17 D. 70

Which oxide produces the most acidic solution when 0.1 mol is added to 1L of H_(2)O ?

Ethyoxyethene is written as follows, H_(2)C=CH-O-CH_(2)-CH_(3) . The structure of 2- Chloro -1- ethoxyethene 9 incorrect name ) with correct numbering wil l be

A 19.6 g of a given gaseous sample contains 2.8 g of molecules (d = 0.75 g L^(-1)) , 11.2 g of molecules (d = 3 g L^(-1)) and 5.6 g of molecules (d = 1.5 g L^(-1)) . All density measurements are made at STP . Calculate the total number of molecules (N) present in the given sample. Report your answer in 10^(23) N Assume Avogardro's number as 6 xx 10^(23) .

The figure shows a region of length ‘l’ with a uniform magnetic field of 0.3 T in it and a proton entering the region with velocity 4xx10^(5) " ms"^(-1) making an angle 60^(@) with the field. If the proton completes 10 revolution by the time it cross the region shown, ‘l’ is close to (mass of proton = 1.67 xx10^(27) kg , charge of the proton =1.6 xx10^(-19) C )

You are given three lenses L_(1),L_(2) and L_(3) each of focal length 10 cm. An object is kept at 15 cm in front of L_(1), as shown. The final real image is formed at the focus 'T' of L_(3). Find the separations between L_(1),L_(2) and L_(3).