The metal oxide which cannot be reduced to metal by carbon is ________.

(a)

PbO

(b)

Al₂O₃

(c)

ZnO

(d)

FeO

Which one of the following ores is best concentrated by froth – floatation method?

(a)

Magnetite

(b)

Haematite

(c)

Galena

(d)

Cassiterite

Among the following, one does not belong to calcination, Pick the odd one out.

(a)

\({ PBCO }_{ 3 }\overset { \Delta }{ \longrightarrow } PBO+{ CO }_{ 2 }\uparrow \)

(b)

\({ CaCo }_{ 3 }\overset { \Delta }{ \longrightarrow } Cao+{ CO }_{ 2 }\uparrow \)

(c)

\(PbS{ O }_{ 3 }\overset { \Delta }{ \rightarrow } PbO+{ 2SO }_{ 2 }\uparrow \)

(d)

\({ ZnCO }_{ 3 }\overset { \Delta }{ \rightarrow } ZnO+{ CO }_{ 2 }\uparrow \)

Carbon atoms in fullerene with formula C₆₀ have _______hybridisation.

(a)

sp³ hybridised

(b)

sp hybridised

(c)

sp² hybridised

(d)

partially sp² and partially sp³ hybridised

An element belongs to group 15 and 3^rd period of the periodic table, its electronic configuration would be_______.

(a)

1s² 2s² 2p⁴

(b)

1s² 2s² 2p³

(c)

1s² 2s² 2p⁶ 3s² 3p²

(d)

1s² 2s² 2p⁶ 3s² 3p³

Strong reducing behaviour of H₃PO₂ is due to______.

(a)

High oxidation state of phosphorus

(b)

High electro gain enthalpy of phosphorus

(c)

Presence of two-OH groups and one P-H bond

(d)

Presence of one-OH groups and two P-H bonds

Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

(a)

Cr

(b)

Pd

(c)

Pt

(d)

none of these

The alloy of copper that contain Zinc is________.

(a)

Monel metal

(b)

Bronze

(c)

bell metal

(d)

brass

Sometimes vessels made of copper or bronze show traces of green colour. This is due to the formation of _________.

(a)

Cu(OH)₂

(b)

CuCO₃

(c)

Cu(OH)₂CuCO₃

(d)

Cu(OH)₂CuSO₄

IUPAC name of the complex K₃[Al(C₂O₄)₃] is _______.

(a)

potassiumtrioxalatoaluminium(III)

(b)

possiumtrioxalatoaluminate(II)

(c)

potassiumtrisoxalatoaluminate(III)

(d)

potassiumtrioxalatoaluminate(III)

The name of complex ion, [Fe(CN)₆]^3- is _______.

(a)

Trieyanoferrate (III) ion

(b)

Hexacyano iron (III) ion

(c)

Hexacyanitoferrate (III) ion

(d)

Hexacyanido ferrate (III) ion

The chemical formula for diammine silver (I) chloride is _______.

(a)

[Ag(NH₃)₂] Cl

(b)

[Ag(NH₃)]Cl

(c)

[Ag(NH₂)₂]Cl

(d)

[Ag(NH₄)₂]Cl

The fraction of total volume occupied by the atoms in a simple cubic is ________.

(a)

\(\left( \frac { \pi }{ 4\sqrt { 2 } } \right) \)

(b)

\(\left( \frac { \pi }{ 6 } \right) \)

(c)

\(\left( \frac { \pi }{ 4 } \right) \)

(d)

\(\left( \frac { \pi }{ 3\sqrt { 2 } } \right) \)

After 2 hours, a radioactive substance becomes \(\left( \frac { 1 }{ 16 } \right) ^{ th }\) of original amount Then the half life (in min) is _______.

(a)

60 minutes

(b)

120 minutes

(c)

30 minutes

(d)

15 minutes

What would be the activation energy of a reaction when the temperature is increased from 27^oC to 37^oC?

(a)

534 kJ mol^-1

(b)

53.4 kJ mol^-1

(c)

5.34 kJ mol^-1

(d)

None of these

For a reaction: aA ⟶ bB, the rate of reaction is doubled when the concentration of A is increased by four times. The rate of reaction is equal to _____.

(a)

k[A]^a

(b)

\(k{ \left[ A \right] }^{ \frac { 1 }{ 2 } }\)

(c)

\(k{ \left[ A \right] }^{ \frac { 1 }{ a } }\)

(d)

K[A]

MY and NY₃, are insoluble salts and have the same K_sp values of 6.2 × 10^-13 at room temperature. Which statement would be true with regard to MY and NY₃?

(a)

The salts MY and NY₃ are more soluble in 0.5M KY than in pure water

(b)

The addition of the salt of KY to the suspension of MY and NY₃ will have no effect on their solubility’s

(c)

The molar solubilities of MY and NY₃ in water are identical

(d)

The molar solubility of MY in water is less than that of NY₃

Which among the following has the highest pH?

(a)

1M NH₄ OH

(b)

1M HCI

(c)

1M NaOH

(d)

0.1 M NaOH

Using the data given below fmd out the strongest reducing agent ______.
\({ E }_{ { Cr }_{ 2 }{ O }_{ 7 }^{ 2- } }^{ o }{ Cr }^{ 3+ }=1.33V{ ,E }_{ { Cl }_{ 2 }{ / }{ Cl }^{ - } }^{ o }=1.36V\)
\({ E }_{ { Mn }O_{ 4 }^{ - } }^{ 0 }/{ Mn }^{ 2+ }=1.51V,{ E }_{ { Cr }^{ 3+ }/Cr }^{ o }=-0.74V\)

(a)

Cr

(b)

Cr³⁺

(c)

Cl^-

(d)

Mn²⁺

The standard conditions for determination of standard emf of the cell are ______.

(a)

1M solution of the reactant

(b)

temperature of 25°C

(c)

both 1M solution of the reactant and temperature of 25°C

(d)

none of these

In the reaction Ethanol \(\overset { { PCl }_{ 5 } }{ \longrightarrow } X\overset { alc.KOH }{ \longrightarrow } Y\overset { { H }_{ 2 }{ SO }_{ 4 }/{ H }_{ 2 }O }{ \underset { 298k }{ \longrightarrow } } Z.\) The ‘Z’ is ______.

(a)

ethane

(b)

ethoxyethane

(c)

ethylbisulphite

(d)

ethanol

CH₃Br \(\overset { KCN }{ \longrightarrow } (A)\overset { { H }_{ 2 }{ O }^{ + } }{ \longrightarrow } (B)\overset { { PCl }_{ 5 } }{ \longrightarrow } \) (C) product (c) is ______.

(a)

acetylchloride

(b)

chloro acetic acid

(c)

\(\alpha\)- chlorocyano ethanoic acid

(d)

none of these

The correct corresponding order of names of four aldoses with configuration given below Respectively is ______.

(a)

L-Erythrose, L-Threose, L-Erythrose, D-Threose

(b)

D-Threose, D-Erythrose, L-Threose, L-Erythrose,

(c)

L-Erythrose, L-Threose, D-Erythrose, D-Threose

(d)

D-Erythrose, D-Threose, L-Erythrose, L-Threose

Saccharin, an artificial sweetener is manufactured from ____________.

(a)

cellulose

(b)

toluene

(c)

cyclohexene

(d)

starch