S and Some P Block Elements

Aluminium oxide is not reduced by chemical reaction since

Options

(a) reducing agent contaminate (b) the process pollute the environment (c) aluminium oxide is highly stable (d) aluminium oxide is reactive

Correct Answer: […]

Pb + Conc.HNO₃ gives

Options

(a) Pb(NO₃)₂ + NO₂ (b) PbNO₃ + NO (c) Pb(NO₃)₄ + NO₃ (d) Pb(NO₃)₃ + N₂O

Correct Answer:

Pb(NO₃)₂ + NO₂

Explanation:

No explanation available. Be the first […]

The lusture of a metal is due to

Options

(a) its chemical inertness (b) its high polishing (c) its high density (d) presence of free electrons

Correct Answer:

presence of free electrons

Explanation: […]

Which of the following is true for diamond

Options

(a) diamond is a bad conductor of heat (b) diamond is a good conductor of electricity (c) diamond is made up of C,H and […]

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 […]