When CO is heated with NaOH under pressure, we get,

(a) Sodium benzoate (b) Sodium acetate

(c) Sodium formate (d) Sodium oxalate

Solution: (c)

Ammonium salts are oxidised in the oil to nitrites by

(a) Denitrifying bacteria (b) Nitrifying bacteria

(c) Ammonifying bacteria (d) Nitrosifying bacteria

Solution: (b)

Carbon dioxide is used for extinguishing fire because

(a) it has a relatively high critical temperature

(b) in solid state, it is called dry ice

(c) it is neither combustible nor a supporter of combustion

(d) it is a colourless gas

Solution: (c)

Non combustible hydride is

(a) NH3 (b) PH3

(c) AsH3 (d) SbH3

Acid rain may cause

(a) rusting easier (b) stone cancer in Taj Mahal

(c) non – fertility of soil (d) all are correct

Solution: (d)

Decomposition of H2O2 is slowed down by addition of

(a) Alcohol (b) MnO2

(c) Alkali (d) Pt.

Solution: (a)

Which of the following on heating give O2 gas?

(a) Lead nitrate (b) Potassium chlorate

(c) Manganese dioxide (d) All the above

A kettle which becomes furred – up in use has a deposit inside it which is composed

mainly of

(a) Calcium carbonate (b) Magnesium bicarbonate

(c) Magnesium sulphate (d) Sodium sulphate

A mixture of hydrazine and H2O2 is

(a) antiseptic (b) rocket fuel

(c) germicide (d) insecticide

Hydrolysis of one mole of peroxy disulphuric acid produces

(a) two moles of sulphuric acid

(b) two moles of peroxy monosulphuric acid

(c) one mole of sulphuric acid and one mole of peroxy mono sulphuric acid

(d) one mole of sulphuric acid, one mole of peroxy mono sulphuric acid and one mole of

H O . 2 2

The blue colour mineral lapis lazull which is used as a semi precious stone is a mineral of

the following class

(a) Sodium alumino silicate (b) Zinc cobaltate

(c) Basic copper carbonate (d) Prussian blue.

The material used in the solar cells contains.

(a) Cs (b) Si

(c) Sn (d) Ti

When iodine reacts with NaF, NaBr and NaCl:

(a) It gives mixture of F2, Cl2 and Br2 (b) It gives chlorine

(c) It gives bromine (d) None of the above

The metal that is extracted from sea water is:

(a) Mg (b) Be

(c) Ca (d) Sr

Ordinary blackboard chalk is made of :

(a) limestone (b) gypsum

(c) fluorspar (d) calcium phosphate

The most electropositive amongst the alkaline earth metals is:

(a) Be (b) Mg

(c) Ca (d) Ba

Which of the following is most acidic ?

(a) Na2O (b) MgO

(c) Al2O3 (d) CaO

Al2O3 formation from aluminium and oxygen involves evoluation of a large quantity of

heat, which makes aluminium use in:

(a) deoxidiser (b) confectionary

(c) indoor photography (d) thermite welding

In the electrolysis of alumina, cryolite is added to:

(a) lower the melting point of a alumina (b) increase the electrical conductivity

(c) minimize the anode effect (d) remove impurities from alumina

Nitrogen (I) oxide is produced by :

(a) thermal decomposition of ammonium nitrate

(b) disproportionation of N2O4

(c) thermal decomposition of ammonium nitrite

(d) interaction of hydroxylamine and nitrous acid.

The major role of fluorspar (CaF2), which is added in small quantities in the electrolytic

reduction of alumina dissolved in fused cryolite (Na3AlF6), is

(a) as a catalyst

(b) to make the fused mixture very conducting

(c) to lower the temperature of the melt

(d) to decrease the rate of oxidation of carbon at the anode.

When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water,

the sodium ions are exchanged with

White phosphorus (P4) has

(a) six P-P single bonds (b) four P-P single bonds

(c) four lone pairs of electrons (d) PPP angle of 600

Ammonia, on reaction with hypochlorite anion, can form

(a) NO (b) NH4Cl

(c) N2H4 (d) HNO2

The pairs of compound which cannot exist together in aqueous solution are

(a) NaH2PO4 and Na2HPO4 (b) Na2CO3 and NaHCO3

(c) NaOH and NaH2PO4 (d) NaHCO3 and NaOH

Highly pure dilute solution of sodium in liquid ammonia :

(a) shows blue colour (b) exhibits electrical conductivity

(c) produces sodium amide (d) produces hydrogen gas

Alkali metals are characterized by:

(a) good conductor of heat and electricity (b) high oxidation potentials

(c) high melting points (d) solubility in liquid ammonia

Li has following abnormal behaviour in its group:

(a) Lithium carbonate decomposes into its oxide on heating, unlike other elements

(b) LiCl is covalent in nature

(c) Li3N is stable compound

(d) LiCl is poor conductor of electricity in molten state

Select wrong statements about alkali metals :

(a) all form (M NH2) amide (b) all form super oxides (M O2)

(c) all form ionic hydrides (M H) (d) all form nitrides

Which among the following compounds are paramagnetic

(a) KO2 (b) K2O2

(c) K2O (d) NO2

Nitrate of which of the following elements are converted to their oxides on heating ?

(a) Li (b) Na

(c) K (d) Mg