Question # 1

Cyclone collector is used for minimizing

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Radioactive pollution

Air pollution

Noise pollution

Water pollution

Inter molecular forces in solid hydrogen are

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Covalent forces

Van der Waal forces or London dispersion force

Hydrogen bonds

All of these

Which species represents the electrophile in aromatic nitrotaion?

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NO^-₂

+

NO₂

NO2

NO^-₃

The total number of protons in 10 g of calcium carbonate is (N_o = 6.023 x 10²³)

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1.5057 x 10²⁴

2.0478 x 10²⁴

3.0115 x 10²⁴

4.0956 x 10²⁴

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

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HCI + anhyd. ZnCI₂

NaCI

PCI₅

SOCI₂

Among the alkaline earth metals the element forming predominantly covalent compounds is

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Be

Mg

Sr

Calcium

The structure of XeF₆

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Distorted octahedral

Pyramidal

Tetrahedral

None of the above

Which has largest first ionization energy?

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Li

Na

K

Rb

Which of the following fluorides does not exist?

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NF₅

PF₅

AsF₅

SbF₅

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