`""_(98)Cf^(246)` was formed along with a neutron when an unknown radioactive substance was bombarded with `""_(6)C^(12)`. The unknown substance was

When calomel is treated with ammonium hydroxide, a black substance is formed. The black substance is -

When excess of SnCl_2 is added to HgCl_2 , the substance formed is

Find the relation when three unknown algebraic numbers a, b, and c which are not zero are in continued proportion.

The sodium salt of an unknown anion when heated with MgCl_2 forms a white precipitate. The anion is -

A galvanometer together with an unknown resistance in series is connected across two identical batteries of each 1.5V When the batteries are connected in series, the galvanometer records a current of 1A and when the batteries are connected in parallel, the current is 0.6A. What is the internal resistance of the battery ?

(a) Based on the nature of intermolecular forces, classify the following solids: Sodium sulphate, Hydrogen. (b) What happens when CdCl_(2) is doppd with AgCl? ( c) Why do ferrimagnetic substances show better magnetism than antiferromagnetic substances?

An organic compound C_(3)H_(8)O_(3) yields on acetylation with acetic anhydride C_(9)H_(14)O_(6) . How many -OH groups are present in the substance ? What is the possible structure ?

An organic compound 'A' (C_2H_6O) reacts with sodium to form a compound 'B' with the evolution of hydrogen gas and gives a yellow compound 'C' when treated with iodine and NaOH. When heated with conc. H_2SO_4 at 140^@C it gives a compound 'D' C_4H_(10) which on treatment with HI at 100^@C gives 'E'. 'B' when heated with 'E' also gives back 'D'. Identify 'A' to 'E' and write equations for the reaction involved.