Question # 1

The decreasing order of the second ionization energies of K, Ca and Ba is

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K > Ca > Ba

Ca > Ba > K

Ba > K > Ca

K > Ba > Ca

Setting of cement is improved by

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Lime stone

Clay

Gypsum

Water

LiAIH4 is most useful reducing agent It reduce to alcohol

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Aldehydes

Ketone

Carboxylic acid

Any of above

The strongest acid is.

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HNO2

HNO3

H2N2O2

HNOS

Ca2+ is isolelectronic with.

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Mg2+

Kr

Ar

Na+

Which of the following contains both covalent and ionic bond.

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CCl4

NH4Cl

CaCl2

H2O

Among the elements A, B,C and D having atomic numbers 7,8,9 AND 12 Respectively, the element with smallest size and highest IE is.

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A

B

C

D

The hybridization of S in SO2 is.

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sp

sp2

sp3

dsp2

"Acids are substance whose aqueous solutions turned blue litmus red and tasted sour" stated by

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Davy

Liebig

Boyle

Rouelle

Considering the elements F, Cl ,O and N, the correct order of their chemical reactivity in terms of oxidizing property is.

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F > Cl > N

F > O > Cl > N

Cl > F > O > N

O > F > N > Cl

Helium oxygen mixture is used by deep sea divers in preference to nitrogen oxygen mixture, because.

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Helium is much less soluble in blood than nitrogen

Nitrogen is much less soluble in blood than helium

Due to high pressure deep under the sea, nitrogen and oxygen react to give poisonous nitric oxide.

Nitrogen is highly soluble in wateer

Which of the following would decompose at lowest temperature.

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MgCO3

SrCO3

BaCO3

CaCO3

Which of the following species have undistributed octahedral structure.

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SF6

PF6

Si F₆^2-

XeF6

Inert pair effect is best shown by

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Si

Z

Sn

Pb

The types of coordinate compounds.

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Labila

Inert

Both A and B

None of above

Which of the following statement is not true regarding Open Hearth process.

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No iron is lost

The process is economical and simple

Steel obtained is of high quality

Scrap iron cannot be used in this process.

Which of the following is most soluble in water

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CaSO4

Sr SO4

MgSO4

BaSO4

Which of the following is not an alkali metal.

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Potassium

Francium

Sodium

Strontium

The high oxidizing power of halogens is favored by.

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Low heat od dissociation of X2

A high electron affinity of the atom

A higher hydration energy of the ion

All of above

Which element are non metals.

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N & P

Sb & Bi

As & Sb

N & Bi

The nature of bonds in compounds of carbon and silicon is mostly

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Covalent

Electrovalent

Metallic

Both A and B

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