Diamond is used I glass cutting due to its
Options
(a) high metallic bonding (b) extreme hardness (c) low metallic bonding (d) high refractive index
Correct Answer:
extreme hardness
Explanation:
No explanation available. […]
Glass is soluble in
Options
(a) HClO₄ (b) Hf (c) aqua regia (d) H₂SO₄
Correct Answer:
Hf
Explanation:
Unlike other halogen acids, HF acid attacks silica and glass. Glass being a mixture of […]
CO₂ is obtained by heating
Options
(a) NaHCO₃ (b) Na₂CO₃ (c) MgCO₃ (d) K₂CO₃
Correct Answer:
NaHCO₃
Explanation:
No explanation available. Be the first to write the explanation for this question by […]
Melting point is the higher for
Options
(a) Ga (b) B (c) In (d) Al
Correct Answer:
B
Explanation:
In the boron family the melting point decreases on moving down the group upto […]
Li occupies higher position in the electrochemical series of metals as compared to Cu since
Options
(a) the standard reduction potential Li⁺/Li is lower than that of Cu²⁺/Cu (b) the standard reduction potential […]
Alum in dyeing of clothes is used as
Options
(a) bleaching agent (b) fire proof material (c) mordant of colour (d) diluent
Correct Answer:
mordant of colour
Explanation:
Alums are the double salts […]
The constituents of porland cement are
Options
(a) CaCO₃+clay+sand (b) CaCO₃+aluminium silicate (c) CaCO₃+clay+SiO₂ (d) CaCO₃+gypsum+clay
Correct Answer:
CaCO₃+gypsum+clay
Explanation:
The essential constituents of portland cement are CaO, silica, alumina, magnesium oxide, and […]
First ionization potential of Mg is
Options
(a) less than Al (b) equal to Al (c) more than Al (d) zero
Correct Answer:
more than Al
Explanation:
No explanation available. Be the first […]
In the manufacture of cement which of the following is used
Options
(a) clay and silica (b) limestone and clay (c) limestone and silica (d) limestone and gypsum
Correct Answer:
limestone and clay
Aluminium reacts with caustic soda to form
Options
(a) aluminium hydroxide (b) aluminium oxide (c) sodium metaaluminate (d) sodium tetraaluminate
Correct Answer:
sodium metaaluminate
Explanation:
No explanation available. Be the first to write […]
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