Question # 1

Which substance is used to lower the melting point of NaCl in Down's cell

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CaCO3

CaCl2

MgSO4

AlCl3

Which of the following is a typical transition metal

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Sc

Y

Ra

Co

Magnesium metal does not burn in the jar of

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N2

O2

Ne

N2 and O2

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

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O2

O2+

O2-

O2^-2

During the manufacturing process of cement the temperature of the decomposition zone goes up to

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600°C

800°C

1000°C

1200°C

Which of the following element is not present in all proteins

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Carbon

hydrogen

Nitrogen

Sulphur

SN1 reaction usually occurs in

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

All of these

The colour of transition metal complexes

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d-d transitions of electrons

paramagnetic nature of transition elements

ionization

loss of s-electron

Which substance is used to convert ethanol to ethyl chloride

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SOCl2

PCl3

PCl5

All of these

What type of reaction occurs between ethene and hydrogen.

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Addition

Substitution

Oxidation

Dehydration

Isopropyl alcohol on oxidation gives

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Acetaldehyde

Acetone

Ether

Propene

The most reactive alcohol when O-H bond breaks is

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Tertiary alcohol

Secondary alcohol

Primary alcohol

Methyl alcohol

Laughing gas is chemically

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NO

NO₂

N₂O

N₄O₄

Out of the elements of group VIA the highest melting and boiling points is shown by the element.

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Te

Se

S

Po

When carbon di oxide is bubbled through lime water, white precipitate is formed This precipitate is.

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COCl2

H2CO3

CaO

CaCO3

Which element is present in chlorophyll

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Ca

Mg

K

Be

Vegetable oils are

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Polyesters

Glycerides of unsaturated fatty acids

Essential oils

Fatty acids

Formic acid is present in.

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Butter

Vinegar

Ant

Sunflower

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