Multiple choice question

In the froth floating process particles stick to froth because–
(a) Easily surface of particles cannot be wet
(b) Particles are insoluble (c) Particle are lighter
(d) These particles are charged
12 og inkFkZ tks fi?kys v;Ldks ls v'kqf);k¡ nwj djus gsrq feyk;k tkrk gS] dgk
tkrk gS&
(a) /kkrqey (b) xSUx (c) xkyd (d) mRizsjd
The substance which is mixed in melted ores for removing impurities, is
called–
(a) Slag (b) Gangue (c) Flux (d) Catalyst
13 izxyu esa fi?kys v;Ld ds lkFk xkyd feykus dk mn~ns'; gksrk gS&
(a) /kkrq dk xyukad de djuk (b) vinzO; vyx djuk
(c) xykukad de djuk rFkk vinzO; i`Fkd djuk (d) /kkrq dks lja/kz cukuk
In smelting purpose of mixing flux is–
(a) Reducing M.P. of Metal (b) Seperate impurities
(c) Reduce melting point and seperate impurities (d) Making metal porous
14 dkusZykbV [kfut fuEu esa ls fdldk gksrk gS&
(a) Ca (b) Na (c) Mg (d) Zn
Carnalite is the ore of–
(a) Ca (b) Na (c) Mg (d) Zn
15 FkekZbV cSfYMax esa iz;qDr inkFkZ gS&
(a) Al pw.kZ (b) Al pw.kZ rFkk Fe 2 O 3
(c) dkcZu rFkk Al pw.kZ (d) Al pw.kZ Fe 2 O 3 rFkk dkcZu feJ.k
In thermite belding process mixture used is–
(a) Al Powder (b) Al Powder and iron oxide (Fe 2 O 3 )
(c) Carbon and Al Powder (d) Al Powder, Fe 2 O 3 and Carbon mixture
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