Question # 1

The mass of the neutron is of the order of

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10^-23 kg

10^-24 kg

10^-26 kg

10^-27 kg

Which one of the halogen acid is a liquid?

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HF

HCI

HBr

HI

Vital force theory was rejected by

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Berzelius

Kolbe

Wholer

Lavoiser

Bell metal is an alloy of

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Cu,Zn,and Sn

Cu,Zn and Ni

Cu and Zn

Cu and Sn

Octane number is zero for

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n-Heptane

Isooctane

n-Hexane

Isoheptane

BiCI₃ on hydrolysis forms a white precipitate of

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Bismuthio is acid

Bismuth oxychloride

Bismuth pentachloride

Bismuth hydroxide

Most common reactions of benzene and its derivatives are

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Electrophilic addition reactions

Electrophilic substitution reactions.

Nucleophilic addition reactions

Nucleophilic substitution reactions

Which has the largest radius?

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CO³⁺

Mn³⁺

Fe³⁺

Cr³⁺

Bromine is obtained on a commercial scale from

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Caliche

Carnallite

Common satl

Cryolite

The movement of solvent molecules through a semipermeable membrane is called

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Electrolysis

Electrophoresis

Osmosis

Cataphoresis

Red lead is

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PbO

Pb₃O₄

PbO₂

Pb₄O₃

The total number of protons in 10 g of calcium carbonate is (N₀= 6.023 x 10²³)

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1.5057 x 10²⁴

2.0478 x 10²⁴

3.0115 x 10²⁴

4.0956 x 10²⁴

1 mole of CH₄contains

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6.02 x 10²³atoms of H

4 g-atom of hydrogen

1.81 x 10²³molecules of CH₄

3.0 g of carbon

The movement of solvent molecules through a semipermeable membrane is called

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Electrolysis

Electrophoresis

Osmosis

Cataphoresis

Which one of the following has the lowest boiling point?

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B

Al

Ga

Ti

Which one of the halogen acid is a liquid?

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HF

HCl

HBr

Hl

Portland cement is manufactured by using

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Limestone, clay and sand

Limestone, gypsum and sand

Limestone, gypsum and alumina

Limestone, clay and gypsum

Which is the most amphoteric?

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Na₂O

MgO

Al₂O₃

CaO

Which of the following units represents largest amount of energy?

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Calorie

Joule

Erg

Electron vol.

A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution?

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12.7 gm

15.9 gm

31.8 gm

63.5 gm

Cyclone collector is used for minimizing

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Radioactive pollution

Air pollution

Noise pollution

Water pollution

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

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Be

Mg

Sr

Calcium

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