Question # 1

When we mvoe top to bottom in group, ionization energy.

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Increases

No effet

Decreases

None of these

A good example of homogeneious mixture is.

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Soil

Ice-Creem

Rock

Wood

Whcih of the following atoms willnot form cation or anion.

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Atomic no. 16

Atomic no. 18

Atomic no. 17

Atomic No. 19

The elements of group 3 to 12 are clled.

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Normal elements

Halogens

Noble gases

Transition elements

The word energy is used in physics ofr the firt time.

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1902

1858

1805

1802

Atomic number of actinium is

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57

60

89

80

Following are state of matter.

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Liquid

Solid

Gas

All of these

Any thing that has mass and occupies space is called.

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Liquid

Gas

Solid

Matter

The colour of hydrated cobalt(II) chloride solid is

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White

Black

Blue

Pink

A bond formed by the mutual sharing an electron pair is called.

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Ionic bond

Metallic bond

Covalent bond

Coordinate covalent bond

All transition elements belong to

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s and p block

d- block

f-block

d and f block

Malic acid founds in:

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Apple

Fats

Rancid Butter

Oranges

Hydrogenation of alkenes and alkynes takes place at room temperature in the presence of.

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Ni

Pt

Pd

Both a and b

The percentage by volume of nitrogen in dry gas is.

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78.09%

20.94%

0.93%

0.03%

Temporary hardness in water can he removed by.

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Boiling Method

Using washing soda

Using sodium zeolite

All of them

Which one of the following is used as jet fuel.

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Kerosene oil

Lubricating oil

Fuel oil

Diesel oil

Acute lead poisoning causes dysfunction of.

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Kidney

Liver

CNS

All of them

Acids have taste

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Bitter

Seetish

Sour

Saltish

Hydrogenation of alkenes and alkynes may be carried out at room temperature in the presence of catalyst:

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Pt or Pd

Ni

Zn

Fe2O3

What percentage of nitrogen and oxygen is in the atmosphere.

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69%

79%

9%

89%

Which one gas is liberated when alkalies react with ammonium salts?

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O₂

CO₂

H₂

NH3

Which colour of HI is ?

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Orange

Purple

Red

Colourless

Repeated extraction using small portions of solvent are more.

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Accurate

efficient

Slow

Rapid

Which of the following has highest percentage ionic character.

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HCl

HF

HBr

HI

A type of meals are usually used as catalyst.

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Coinage metal

Alkali metals

Transition metals

alkaline earth metals

When concentration of one product is removed at equilibrium stage, in which direction it moves to reestablish equilibrium.

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Forward

Reverse

Neither forward nor reverse

Equally move in both direction

Oxidation number of Cr in a C₂CrO₄ is

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+2

+4

+6

+8

Solvent extraction method is a particularly useful technique for separation when the product to be separated is.

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Non volatile or thermally unstable

Volatile or thermally stable

Non volatile or thermally stable

Volatile or thermally unstable

The nature of copper crystals is

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Metallic

Ionic

Covalent

Molecular

Which statements not correct about Galvanic cell.

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Anode in negatively charge

Reduction occur at anode

Cathode is positively charged

Reduction occur at cathode

What amount of NaOH is required to prepare 500 g of 0.5 molal solution.

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10 g

20 g

30 g

40 g

Which of the following compound has the highest % o f oxygen by weight

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CH₃- OH

C₂H₅OH

HCOOH

H₂O

The unit of rate constant is the same as that of the rate of reaction is.

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

Isopropyl alcohol on oxidation gives

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Acetaldehyde

Acetone

Ether

Propene

The element of 2nd period, which has highest ionization energy from the following is

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Be

C

N

O

Which of the following gas will turn lime water milky

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Cl₂

NO₂

CO

CO₂

Across a period from left to right in the periodic table, the melting and boiling point.

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Decrease

Increase

Remain constant

First increase upto the middle of period and then decrease

Which one of the following elements has no variable valency.

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Zinc

Iron

cobalt

Manganese

The general formula for Alkanes is

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C_nH_2n+1

C_nH_2n

C_nH_2n-2

C_nH_2n+2

In group V-A elements the most electronegative elements is

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Sb

N

P

As

Stainless steel is

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Compound

An element

Mixture

100% pure iron

In which ore carbon is present

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Magnesite

Epsom salt

Barite

Sylvite

Which of the following gives acidic oxide

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N

As

Sb

Bi

Paraldehyde is polymer of.

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HCHO

CH3CHO

CH3COCH3

CH3CH2-CH2OH