Question # 1

The simplest formula of a compound containing 50% of element X

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XY2

XY

X2Y

None of the abvoe

Length of semiconductor nanorods are in the range of.

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1.50 nm

1-50 micro meter

100-500 nm

50-100 nm

An example of nitro dyes is.

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Martius yellow

Auramine O

Malachite green

Methyl red

Berllium has diagonal relationship with

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Li

Al

B

Na

Which of the following salt is not used in salt bridge to minimize liquids junction potential.

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KCl

NH4Cl

KNO3

CaCl2

All halogens exist as covalent molecules.

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Monoatomic

Daitomic

Triatonic

Tetra atomic

The point at which the reaction is observed to be complete is called.

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The equivalence point

The end point

The triplet point

The equilibrium point

The overall energy change during the Cannot cycle to.

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Equal to zero

Equal to Q

Equal to W

Maximum

Which of the following is a natural polymer

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Nylon

Leucite

Cellulose

Polystyrene

The action of all the relations of all the organism to their environment is called

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Biology

Botany

Ecology

Archiology

If there are only two components in a solution with mole fraction X_Aand X_Bthen which of the following relation is correct.

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X_A + X _B = 0

X _A + X _B > 1

XA = XB < 1

XA = 1 - XB

Which of the following has the highest melting poing.

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NaCl

Li Cl

KCl

Rb Cl

When a drop of detergent solution is added onto a clean towel. It spreads instead of existing as a droplet Which of the following statements explains this phenomenon.

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Detergent acts as an emulsifying agent

Detergent reduce surface tension of water

Detergent reduces surface tension of water

All of above

Which of the following species is very poor oxidizing agent

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H+

Zn²⁺

Fe³⁺

MnO₄

Which of the following statements is not correct with respect to applications of Hammett equations.

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It develops a quantitative relationship between structure and reactivity

This equation on can be used to calculate the value of pK_a

This equation does not help to calculate the rate of some reactions

This equation has mechanistic implications

Which of the following is not alloy of aluminium.

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Aluminium bronze

Magnalum

Duralumin

Stellite

Ionic bond are also forces called as.

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Polar bond

Electrovalent bond

None polar bond

Both A and B

The percentage of nitrogen in ammonium sulphate is__________%

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27

21

23

19

Domestic waste mostly constitutes

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Non biodegradable pollution

Biodegradable pollution

Effluents

Air pollution

Which of the following will be most effective int he coagulntion of

Fe (OH)3 sol.

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NaCl

MgSO4

AlCl3

Mg3 (PO4)2

As it passes into food chain, the concentration of DDT

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Remains same

Decreases

Increases

Unpredictable

Is an instate able colourles gas with a sticky sweet odor and is extremely toxic.

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B2 H6

B4 H10

B3 H9

B6 H10

Which of the following has the highest lattice energy

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LiCl

NaCl

KCl

CaCl

The most reactive alkali metal among the following is

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Li

Na

Cs

Rb

Which of the following statement is not correct regarding galvanic cells.

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Oxidation occurs at the anode

Ions carry current inside the cell

Electrons flow around the external circuit. form cathode to anode

When the e.m.f. of the cell is positive cell reactionis spontaneous

Which of the following statement is not related with high quantum yield reasons.

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Formation of reactive intermediates which may act as catalyst

The active molecules may collide with other molecules and activates these molecules.

The reaction may be exothermic and heat evolve may activate other molecule

The primary photo chemical process may be reversed

Which of the following statements are correct for Linear polymers.

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Linear polymers may be condensation as well as addition polymers

Structure is well packed in nature

Linear polymers have higher density higher melting point and higher tensile strength

All are correct

The unit of specific conductance will be

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S cm-1

Ohm cm

Ohm cm-1

Mho cm

Which metal can produce dihydrogen gas by reaction with dil H2SO4

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Ag

Fe

Cu

Pt

Which of the following will have the largest pH?

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O.1 N HCl

0.1 N CH3COOH

0.1 N NaOH

0.01 N NaOH

The particle would be stationary in a lattice only at.

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273 K

0 K

298 K

373 K

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