Question # 1

Whcih subshells are present in L - shell?

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S and P

Only s -sub shell

Only p - sub shell

Sub shell

The reaction in which the products can recombine to formreactants are called.

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Reversible Reaction

Irreversible reactions

Decomposition reactions

Addition reactions

The horizontal lines present in the priodic table are called.

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Groups

Periods

Both a and b

None of these

Which of the following does not happpen, when a system is at equilibrium state.

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Reaction continues to occur in both the directions

Concentration of reactants and products stop changig

Forward and reverse reactions stop

Forward and reverse rates become equal

All the noble gases have their valence electrons.

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Incomplete

Partialy filled

Completely filled

None of the above

17th group elements ae known as

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Alkaki metals

Alkaline earth metals

Noble gases

Halogens

How many elements are prsent in each 2nd and 3rd period.

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2

32

18

8

d- subshell can accommodate maximum electrons.

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2

6

10

14

All metals bear

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Positive charge

Negative charge

Both a and b

None of these

How many blocks are presnt in modern periodic table

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2

3

4

5

When a reaction will be come a reversible one?

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If the actvation eneryg of the forward reaction is comparrble to that of backward reaction

If the activation energy of the forward reaction is higher than that of backward reaction

If the activationenergy of the forward reaction is lower than that of backward reaction

If the enthalpy change of both the reactions is zero.

How trace amount of acetylene present in the coat gas.

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0.06%

0.07%

0.08%

0.09%

The major constituents of troposphere are:

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carbon dioxide and argon

nitrogen and oxygen

argon and oxygen

carbon dioxide and oxygen

Which gas is used to prepare ammonia?

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N₂

O₂

Cl₂

S

Acids have taste

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Bitter

Seetish

Sour

Saltish

Water dissolves non-ionic compound by

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Ion-ion forces

Ion-dipole forces

Dipole -dipole forces

Hydrogen bonding.

Dehydrohalogenation takes place in the presence of .

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NaOH aqueous

Alcoholic KOH

Aqeous KOH

Alcoholic NaOH

When CaCO_3,.is heated in an open flask, it decomposes to form calcium oxides and .

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O₂

CO

CO₂

CO₃

Which one of the following cannot by hydrolyzed?

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Polysacchrides

Monosacchrides

Oligosacchrides

All of these

Monosaccharides are crystalline solids

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Grey

Crimson

Silver

White

When the number of moles of both sides are equal in a reaction then the unit of Kc will be:

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no unit

mol-2 dm6

mol dm3

mo-2 dn

Such reactions which continue in both directions are called.

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Irreversible

Reversible

Nonreactive

Dynamic

In BeCl2, the covalent bond is formed due to overlap of

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sp -s

sp -p

sp2 -p

sp3 -p

X- rays have same nature as

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Alpha rays

Beta rays

Gamma rays

Cathods rays

The substance which decrease the activity of a catalyst is called.

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Promoter

Activator

Inhibitor

Positive catalyst

Which statement is correct about solubility product constant.

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It is applicable at highly soluble substances.

Value of Kap is independent of temperature

It is used for homogeneous aquarium system

It can be used to predict that precipitation will take place or not by combining two ions

The number of moles of CO₂which contain 8.0 g of oxygen

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0.25

0.50

1.0

1.50

Which pair of compound are isomorphic in nature.

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NaCl and KNO3

KNO3 and MgO

MgO and NaF

CaF and CaCO3

the volume occupied by 1.4 of N2 at S.T.P is

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2.24 dm3

22.4 dm3

1.12 dm3

112 cm3

Which one of the following gases cannot be liquefied by Line's method.

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Water vapours

NH3

Nitrogen

H2

The highest temperature above which a gas cannot be liquified, no matter how much the pressure is applied is known as

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Boiling temperature

Consulate temperature

Absolute zero

Critical temperature

A limiting reactant is that one which

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Gives greatest number of moles of products

Gives least number of moles of products

Is left behind after the completion of reaction

Is mostly a cheaper substance as compared to other reactants

Diamond is a bad conductor of electricity because

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It has a tight structure

It has a high density

There are no free electrons present in the crystal of diamond to conduct electronics

None of these

How much fresh water is used for domestic purpose

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8%

23%

69%

100%

Select from the following the one which is Alcohol

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CH₃CH₂OH

CH₃OCH₃

CH₃COOH

CH₃.CH₂.Br

Group VI B of transition elements contains.

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Zn, Cd, Hg

Fe, Ru,Os

Cr, Mo, W

Mn, Te, Re

Which one of the following species is not an electrophile.

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HN3

Br

H+

BF3

The thickness of ozone layer is.

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25 to 50 km

25 to 28 km

3 km only

1 km only

Which one is cyclic amino acid

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Glycine

Alanine

Proline

Aspartic acid

The composition mixture of clay and lime stone in the raw material.

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75% lime stone and 25% clay

25% lime stone and 75% clay

15% lime stone and 55% clay

55% lime stone and 15% clay

Which hydride is intermediate in nature.

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NaH

BeH2

NH3

HCl

Which of the following specie has the maximum number of unpaired electrons.

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O2

O2+

O2-

O2^-2

Which one of the following pairs of metal reactive directly with nitrogen

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Na and Mg

Li and Mg

Mg and Ca

Li and Be

Methyl alcohol can be represented by all of the following words or symbols except.

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CH3OH

Wood spirit

Methanol

Grain alcohol