The correct statement is :
Cassiterite is a principal ore of tin containing SnO2.
Pyrolusite-MnO2, Dolomite-CaCO3.MgCO3, Galena-PbS
Which process is used for benefication of ores?
Dressing or benefication of ore involves removal of impurities from ore.
Which of the following statements regarding the metallurgy of magnesium using electrolytic method is not correct?
Molten magnesium is lighter than ore.
On strongly heating AgNO3 we get:
The coordination number of copper in the complex formed by adding excess of NH3 to CuSO4 solution is:
Powdered silver ore is treated with NaCN solution and air is bubbled through the mixture to give:
Which is not correct regarding copper sulphate?
Rest all reactions take place.
Which method of purification is represented by the following equation?
This is Van Arkel method for purification of Ti.
In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are:
The reactions involved in cyanide extraction process are:
What effect is noticed on shaking dilute sulphuric acid with a small quantity of anhydrous copper sulphate?
blue in colour
A blue colouration is not obtained when:
Cuprous chloride is obtained from cupric chloride:
In the purification of copper by electrolysis, which is incorrect?
Cu2+ is discharged at cathode.
In order to refine “blister copper” it is melted in a furnace and is stirred with green logs of wood. The purpose is:
it is a reason for given fact.
When excess of sodium thiosulphate is added to dil. AgNO3 solution, a soluble compound X is formed. However, when dil. Na2S2O3 solution is added to conc. AgNO3 solution a white ppt., turning yellow and finally black ppt. of Y is obtained. Which is correct pair?
Which oxide is least stable at room temperature?
Which one of the following pairs of substances or reaction will not evolve H2 gas?
Cu is placed below H in electrochemical series.
Before introducing FeO in blast furnace, it is converted to Fe2O3 by roasting so that:
FeO can forms slag with SiO2.
Which of the following statements about the advantage of roasting of sulphide ore before reduction is not true?
and H2S and thus, C and H2 cannot reduce metal sulphide.
In the commerical electrochemical process for aluminium extraction, electrolyte used is:
it is a fact
Match the extraction process listed in column I with metals listed in column II.
Column I Coumn II
A. Self-reduction (P) Lead
B. Carbon reduction (Q) Silver
C. Complex formation and (R) Copper
displacement by metal
D. Decomposition of iodide (S) Boron
In context with the transition elements, which of the following statements is incorrect?
In the highest oxidation state transition metals say Mn2O7, CrO3 shows acidic nature. However, the cationic complexes are formed in higher as well as lower oxidation states.
Which statement about corrosive sublimate is incorrect?
Which is not true?
Which statement is correct?
All are facts
Iodide of Millon’s base is:
It is called iodide of Million’s base
A yellow ppt. is formed when H2S is passed through an acidified solution of :
CdS is yellow soild
Potassium manganate (K2MnO4) is formed when:
The inner transition elements are the elements in which the added electrons go to:
This is characteristic of inner transition elements
Which of the following statements is not correct?
La(OH)3 is more basic than Lu(OH)3 beacuse La3+ ion is larger than Lu3+ ion
The correct statements(s) among the following is/are:
(i) All the d and f-block elements are metals (ii) All d and f-block elements form coloured ions
(iii) All d and f- block elements are paramagnetic
it is a fact
Which of the following statements is wrong?
In acidic solution, changes to
Which statement is not correct?
Polymetallic carbonyls are also known for transition metals.
The number of ions formed on dissolving one molecule of FeSO4(NH4)2SO4.6H2O is:
Blue colour/precipitate will be obtained when K4[Fe(CN)6] react with:
The formula of sodium nitroprusside is:
Which one of the following ionic species will impart colour to an aqueous solution?
Only Cr3+ has unpaired electrons.
Acidified potassium dicharomate is treated with hydrogen sulphide. In the reaction the oxidation number of chromium:
In niroprusside ion, the iron and NO exist as FeII and NO+ rather than FeIII and NO . These forms can be differentiated by:
will show different magnetic moment.
Anhydrous ferric chloride is prepared by:
In (c) and (d) hydrated ferric chloride (FeCI3.6H2O) is formed.