Question # 1

All metals are solid except

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AI

Mg

Na

Hg

When temperature of water drops to ____________ °C it convert onto ice.

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0

-2

-1

1

Which one of the following solution contains more water?

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2M

IM

0.5M

0.25M

Which one is moderate reactive metal?

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Pb

Na

Ca

Mg

The isotopes of an element have different number of

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Electrons

Protons

Neutrons

Protons & Neutrons

In metal hydrides, the oxidation number of hydrogen is

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+1

-1

+2

-2

Br2 + H2S __ 2HBr + S, which one is oxidizing agent:

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H2S

Br2

S

2HBr

Which of the following can be separated by physical means?

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Mixture

Element

Compound

Radical

____________ cell is made of two half of cells.

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Zinc cell

Galvanic

Both

All

At ____________ °C water converts to ice.

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101°

100°

99°C

100.2°C

A _________ is a pure substance is made up of two or more elements.

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Mixture

Elements

Solution

Compound

Which acid is found in sour milk?

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`Formic acid

Lacitc acid

Citric acid

Butric acid

Methyl butanoate smell like.

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Apple

Mange

Lemon

Grapes

The lives of aquatic plants and animals are indirectly related to concentration of dissolved gas in water.

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Nitrogen

Hydrogen

Oxygen

Carbon

Deficiency of Vitamin E causes.

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rickets

Scurvy

Anemia in babies

Night blindness.

The general formula of alkynes is

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C_nH_2n

C_nH_2n+2

C_nH_2n-2

C_n H_2n+1

In dry cleaning, which chemical is used.

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Chloroform

Carbon tetachloride

Ecetaldehyde

Ethanol

Which one of the following statements is not correct about active mass?

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Rate of reaction is directly proportional to activ emass.

Active mass is taken in molar concentration

Active mass is represented by square brackets

Active mass means total mass of substances.

Which of the following is the hardest coal?

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Pear

Lignite

Bituminous

Anthracite

The chemical used in Clark's method is:

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CaO

slaked lime(Ca(OH)s)

washing soda

sodium zeolite

What is the POH of a 0.02 M Ca(OH)₂?

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1.698

1.397

12.31

12.61

Chloroform is used for

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Anesthesia

Fever

Link

Toys

The polarizabilities of elements mostly increase down the group due to the reason that

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The atomic numbers increase

Number of protons increase

Number of shells increase along, with increase of shielding effect

The behavior of the elements remain the same

How many moles of AgCI are produced by combination of 1.0 mole of AgNO₃and 2.0 mole of NaCI

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1.0

2.0

3.0

4.0

Which substance is nto a dehydrating agent.

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CaCl3

CdCl2

Silica gel

P2O5

In Al2O3, the ratio between the ions is

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1 :2

2:1

2:3

3:2

Tin has isotopes.

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9

10

11

12

Quantum number values for 3p orbitals are.

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n = 0, l = 3

n = 3 , l = 1

n = 2, l = 1

n = 2 , l = 3

An aqueous solution of ethanol is water has vaporu pressure.

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Equal to the of water

Equal to that of ethanol

More than that of H2O

Less than that of water

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ions in the filtrate

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How many sigma and pi bonds are present in C2H2.

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one sigma and two pi

two pi and one sigma

Two pi and three sigma

Three pi and two sigma

Which one of the following gases diffuse more rapidly.

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Cl2

CO2

CH4

N2

The wave number of the light emitted by a certain source is 2 x 10⁶ m-1 . The wavelength of this light will be.

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500 nm

5000 nm

200 nm

5 x10⁷ m

Formula of marsh gas is

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CH₄

C₂H₆

C₃H₆

C₄H₁₀

Which is more basic

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RbOH

NaOH

KOH

Li OH

Which one of the following is an amide

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(NH₂)₂CO

NH₂.CH₃

C₆H₅NH₂

N(CH₃)₃

The percentage of clay and liem stone in cement is in the ratio of.

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1 : 1

1 :2

1:3

3:1

Which one of the following compounds is the isomer of ethyl alcohol.

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CH3OH

CH4OCH3

CH5-CH(OH)CH3

CH3OC2H5

Which three elements are needed for the healthy growth of plants.

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N,S,P

N, Ca, P

N,P,K

N,K,C

Which one of the following elements exhibits s-inert pair effect.

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B

Al

Pb

Sc

The carbon atom of a carbonyl group is

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sp hybridized

sp²hybridized

sp³hybridized

none of these

The length of the polymer chain is specified by the number of repeating units which is called.

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Condensation

Co-polymerization

Iodine number

Degree of polymerization

Out of all the elements of Group V-A the highest ionization energy is possessed by

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N

P

Sb

Bi

Ester are formed the reaction of carboxylic acid with.

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Alcohol

Ethers

Aldehydes

Alkyl halides