Name the method of formation of two roads of the gold metal are immersed in cold alkaline water and a direct electric are is struck.

You are given conc. HCl and salts of some alkaline earth metals and directed to conduct flame test and to detect the cation present in each salt. (a) Can you detect all the cations which are given here by this method? [CaCl_2, MgSO_4, Ba(NO_3)_2, BeCl_2, SrCl_2] (b) Justify your answer. (c) What is the mechanism of this test?

The names of some metals are given below. Tungsten, Gold, Sodium, Copper, Iron, Magnesium Answer the following questions by selecting the appropriate ones from the list. Which metal with high malleability is used for making ornaments? Which of these metals reacts with cold water? Which of these is a hard metal but corrodes easily?

Two metal plates A and B are connected to cell of emf 2V is shown in the figure A charged particle starting from rest moves in the opposite direction of electric field, is it an electron or proton?

Colloidal solution of gold is prepared by striking an electric are between gold electrodes kept in water. What is this method called as? Why is it regarded as a dispersion method?

Alkali metals and alkaline earth metals belong to the s-block of the periodic table. Name the industrial process for the manufacture of sodium carbonate .The above mentioned method is not suitable for the preparation of potassium carbonate. Give the reason

Take hot water and cold water in two test tubes. Add one drop of phenolphthalein to both of the test tubes. Then add magnesium ribbon of the same size to this test tubes. a) Which test tubes shows the sudden formation of pink colour? b) What is the reason for the sudden formation of pink colour? c) Which gas is formed? d) Write the equation for the chemical reaction.

A horizontal metal wire is fixed on a state of tension between two vertical supports when plucked it gives a fundamental frequency f_0 . What change,if any,will be observed in the fundamental frequency if the wire is now immersed in water and plucked again?

Name two metals which can be refined by van-Arkel Method.

Ferric hydroxide sol can be prepared from freshly perpared ferric hydroxide precipitate. It can also be prepared by adding ferric chloride solution to boilling water. In both cases the sol particles are positively charged. Name the above two methods of preparation of ferric hydroxide sol.