NEET Practice Questions (MCQs) with Answers & Solutions

Assertion Reason type Statement 1) Ultra pure silicon is manufactured by vapour phase refining Statement 2) Vapour phase refining gives ultrapure metals

Assertion Reason type Statement 1) Ni is converted to $ Ni(CO)_4 $ in Mond process Statement 2) $ Ni(CO)_4 $ is volatiles & the compound can be easily disposable

True / false questions The metals which can be extracted using carbon/coke

1. Magnesium
2. Iron
3. Potassium
4. Zinc

True / false questions `1) $ \triangle G^ \circ = -nFE ^\circ $ 2) The above equation is the principle used in electrolytic reduction for manufacture of metals 3) 2Cu_2S_{(s)} + 3O_{2(g)} \rightarrow 2Cu_2 O_{(s)} + 2SO_{2(g)} \triangle S $ is positive in this reaction 4) $ \triangle G = \triangle H – T \triangle S $ if free energy change is negative the reaction is spontaneous

True / false questions

1. Ore is heated strongly during calcinations to remove all volatile impurities
2. Ore is heated with oxygen during roasting to convert sulphide to oxide
3. Cryolite is added to bauxite in Hall Heroult’s process to increase solubility of bauxite in __
4. After leaching of bauxite, it is directly used as an electrolyte

True / false questions

1. The reduction reaction by accepting electrons is known as electro nation
2. In extraction of Gold and silver by process of leaching $ K \gt 1 $
3. If $ \triangle H = -1369 KJ/ mol^{-1} , \triangle S= +26 J/mol^{-1} T = 400K for the reaction $ A + B \rightarrow C $ the reaction is non spontaneous

True / false questions

1. Chewing of cathode occurs in Hall Heroult’s process
2. When water is added after digesting boxide, $CO_2$ is bobbled to nutrelise the solution
3. HCl can not be replaced in (2) because $AlCl_3$ is formed which is highly soluble

True / false questions

1. Al is used in preparation of parts of airplane and manufacture of alloy alnico.
2. Copper is used in preparation of tubes of boilers, delta metal and muntz metal.
3. Copper and aluminum are used in alloys – Duralumin, Aluminum bronze.
4. Cu &Zn are used in manufacture of German Silver.

True / false questions

1. Wet metallurgical process is used for pyrites ores of lower grade.
2. $ 2Cl^- +2H_2O \rightarrow 2OH^- +H_2 +Cl_2 $ The cell potential is -2.186V.This reaction will take place in forward direction.
3. Pure Zn metal is called spleter.
4. The abundance of Al is highest .Its place is third & is about 8.3% by weight.

Chloroethane reacts with Na in Presence of dry ether. The Product is