Question # 1

d-block elements are also called :

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alkali metal

Alkaline earth metals

Transition elements

Electron deficient elements

Quality of fuel is judged from its octane number. The best fuels are

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Straight chain hydrocarbons

Branched chain hydrocarbons

Cyclic compounds

Compounds containing benzene ring

With amino acids ninhydrin solution gives

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Blue

Violet

Bluish violet

White

The substance having highest conductivity at room temperature among the following is

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0.1 N HCl

0.1 N NaCl

Graphite

Glass

Acetamides are formed by the reaction of carboxylic acids with

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Acids

Bases

Salts

NH₃

Which of the following has more unpaired d-electrons?

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Zn⁺

Fe²⁺

Ni³⁺

Cu⁺

Mass of simple electron is:

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9.1 x 10^-31 kg

9.1 x 10^-30 kg

1.66 x 10^-31 kg

9.1 x 10^-31 kg

Which of the following pairs are chemically dissimilar?

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Na and K

Ba and Sr

Zr and Hf

Ca and Zn

The chemist who synthesized urea form ammonia cyanate was:

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Berzelius

Kolbe

Wohler

Lavoiser

The number of elements in the first, second and third period are

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2, 8, 18

8, 2, 18

2, 18, 8

2, 8, 8

Depletion of ozone layer is due to

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Oxides of nitrogen

Oxides of carbon

Oxides of sulphur

None of the above

Burning of fossil fuels is the main source of pollution

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Nitrogen oxide

Nitric oxide

Nitrous oxide

Sulphur dioxide

Grignard reagent is prepared by the reaction of magnesium metal with alkyl halide in the presence of

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Alcohol

Water

Suephuric acid

Dry ether

Most transition elements show

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Diamagnetic behavior

Ferromagnetic behavior

Paramagnetic behavior

None of these

K,Ca and Li metals may be arranged in decreasing order of their reduction potential as :

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Li, k, Ca

Ca, K, Li

Li, Ca, K

K, Ca, Li

What is formed when propanone is refluxed with an anhydrous solution of NaBH₄

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Propanal

Propan-1-ol

Propan-2-ol

Propane

The chemical formula of Epson salt is

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MgSO₄

MgCl₂

MgSO₄. 7H₂O

MgCl₂. 7H₂O

Coordination sphere may be:

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Cationic

Anionic

Neutral

All above

Polycyolic aromatic hydrocarbons are taught to be

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Disinfectant

Carcinogenic

Helpful

Reactive

In Millikan method for determination of charge on electron the air in the chamber is ionized by

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Protons

Electric field

X-rays

a - particles

0.5 mole of CH4and 0.5 mole of SO2gases have equal

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Volume

Mass in grams

Total number of atoms

Number of molecules

Mass spectrometer measures the

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Exact mass of an element

Average mass of an element

The number of elements present in a molecule

m/e value of a positive ion

Acetylene is used in the manufacture of

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Rubber

Plastic

Ethyle alcohol

All of these

Which of the following yield both hydrogen and chlorine on electrolysis:

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Electrolysis of acidified water.

Electrolysis of molten NaCl

Electrolysis of aqueous NaCl

Electrolysis of saline water

If a large number of amino acids (hundreds to thousands) are joined by peptide bonds, the resulting product is called

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Dipeptide

Tripeptide

Polypeptide

None of these

The shape of CIO^-₃according to valence shell electron pair repulsion theory will be

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Planar triangle

Pyramidal

Tetrahedral

Square planar

A six membered ring containing one double bond called

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Cyclohexene

Cyclohexane

Cyclohexadiene

None

The compound prepared by a substitution reaction of benzene is

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Acetophenone

Glyoxal

Cyclohexame

Hexabromo cyclohexane

The electron releasing effect of methyl group is significant and it makes ring a good

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Electrophilic

Nucleophilic

Nucleophobic

Hydrophobic

The free spaces between the metal atoms and its crystal lattice are called

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Valance spaces

Empty spaces

Interstices

None

In a Galvanic cell, the electrons flow from

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A node to cathode through the solution

Cathode to anode through the external circuit

Anode to cathode through the external circuit

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