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''(19)^39K and ''(20)^40Ca are....

`''_(19)^39K` and `''_(20)^40Ca` are_________.

A

isotones

B

isobars

C

Isotopes

D

isomers

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The number of electrons in [''_(19)^40K]^-1 is_____.

The measures of angles of a triangle are x^@ , (x - 20)^@ and (x-40)^@ . Find a measure of each angle.

Under the same reaction conditions, the intial concentration of 1.386 mol dm^(-3) of a substance becomes half in 40 s and 20 s for first order and zero order kinetics, respectively. The ratio (k_(1)//k_(0)) of the rate constants for first order (k_(1)) and zero order (k_(0)) of the reaction is

tan70^@-tan20^@-2tan40^@=

tan20^@tan40^@tan60^@tan80^@=

Following are atomic masses of a few elements in Dalton and the molecular formulae of some compounds. Deduce the molecular masses of those compounds. Atomic masses H(1), (16), N(14), C(12), K(39), S(32) Ca(40), Na(23), CI(35.5), Mg(24). Al(27) Molecular formulae → NaCI, KNO,H2O, AICI3, Ca(OH), MgO, H2SO4, NaOH​Mg(24). Al(27) Molecular formulae → NaCI, MOCI,, KNO,H,O, AICI, Ca(OH),, MgO, H,SO, HINO, NaOH​

Simplify ( i ^( 29) + i ^( 39) + i ^( 49))/( i ^(30) + i ^(40) + i ^(50))

tan 70^(@) - tan 20^(@) -2 tan 40^(@)=