A car battery is charged by a 12 V supply and the energy stored in it is `7.20 xx10^ 5`J.The charge passed through the battery is

(a) `6.0xx10^4 C`
(b) `5.8xx10^3 J`
(c) `8.64xx10^6 J`
(d) `1.6xx10^5 C`

A beer has a pH of 4.30. What is the [H_(3)O^(+)] ? (a) 3.0xx10^(-4) (b) 2.0xx10^(-4) (c) 2.0xx10^(5) (d) 5.0xx10^(-5)

Compare the following numbers: (i) 2. 7xx10^(12) and 1. 5xx10^8 (ii) 4xx10^(14) and 3xx10^(17)

The presssure of a medium is changed from 1.01xx10^(5) Pa to 1.165xx10^(5) Pa and change in volume is 10 % keeping temperature constant . The bulk modulus of the medium is (a) 204.8 xx 10^(5) Pa (b) 102.4xx10^(5) Pa (c ) 5.12xx10^(5) Pa (d) 1.55xx10^(5) Pa

pH of a saturated solution of Ba(OH)_2 is 12. The value of solubility product K_(sp) " of " Ba(OH)_2 is (a) 3.3 xx 10^(-7) (b) 5.0 xx 10^(-7) (c) 4.0 xx 10^(-6) (d) 5.0 xx 10^(-6)

Silver and copper voltmeters are connected in parallel with a battery of emf 12V . In 30 minutes, 1g of silver and 1.8g of copper are liberated. The power supplied by the battery is (Z_(Cu) = 6.6xx10^(-4) g//C and Z_(Ag) = 11.2xx10^(-4)g//C )

Express the following numbers in usual form. (i) 3.02 xx 10^-6 (ii) 4.5 xx 10^4 (iii) 3 xx 10^(-8) (iv) 1.0001 xx 10^9 (v) 5.8 xx 10^12 (vi) 3.61492 xx 10^6

For given enegy, corresponding wavelength will be E = 3.03 xx 10^(-19) Joules (h = 6.6 xx 10^(-34) j X sec., C = 3 xx 10^(8) m/sec

Ionisation constant of CH_(3)COOH is 1.7xx10^(-5) and concentration of H^(+)ions is 3.4xx10^(-4) . Then, find out initial concentration of CH_(3)COOH molecules. (a) 3.4xx10^(-4) (b) 3.4xx10^(-3) (c) 6.8xx10^(-4) (d) 6.8xx10^(-3)

What is the pH of the following solutions: a. 10^(-8)M HCl b. 5 xx 10^(-8) M HCl c. 5xx10^(-10)M HCl d. 10^(-3) M HCl

The Avogadro's number is 6.02xx10^(23) per gm mole and electronic charge is 1.6xx10^(-19) C . The Faraday's number is