Question # 1

Cement is mixture of so many compounds roasted in rotary kiln.Which substance has greater percentage:

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Lime

Alumina

Silica

Magnesia

Which set of elements is good loser of electrons

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F2. Cl2, Br2

N, P. As

O. S, Se

Li, Na, K

Cotton is an example of

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animal fibre

mineral fibre

vegetable fibre

synthetic fibre

What will be the pH of 1.0 mol dm -3 of H2X, which is only 50% dissociated

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1

0

2

Less than 0

The range of UV-B is:

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320 to 400 nm

200 to 280 nm

280 to 320 nm

50 to 400 nm

Baever's reagent is misture of

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HCI& ZnCl

Ageous bromine

Alkaline KMn4

Mix of Br2&KMnO4

An example of simple protein is

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lipoprotein

Cholesterol

lecithin

globulin

Per hydro cyclopentano phenathrene is the basic structure of all the:

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Proteins

vitamins

waxes

amines

A transition element X has a configuration [Ar) 4s3dd in its +3 oxidation state. Its atomic number is

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25

26

22

19

Volcanoes produce SO₂:

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47%

57%

67%

77%

In incinerating the waste is burnt at

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1000°C

100°C

2000°C

1500°C

In the ground state, an element has 13 electrons in its M shell. The element is

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Copper

Chromium

Nickel

Iron

The Mn³⁺has ______ color

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Violet

Green

Red/brown

No color

Activity of the enzyme is reduced by

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Temperature

Concentration

pH

Inhibitors

Which one of the following equations represent the reaction that occurs when calcium nitrate is heated strongly

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Oceans cove ______ percent of the surface of the earth

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60

70

80

97

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Hear of reaction

Heat of formation

Heat of neutralization

Heat of combustion

First atomic theory was put forward by an English school teacher:

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Maxewell

Newton

Sanger

John Dalton

Baukelite is a polymer obtained from two monomers

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Phenol and ethanol

Phenol and methanol

Phenol and methanal

Phenol and acetone

The electrode through which the electrons enter the electrolytic solution is electrolytic solution is

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Anode

Cathode

May be anode or cathode

None of these

Isotopes differ in

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properties which depend upon mass

arrangement of electrons in orbitals

chemical properties

the extent to which they may be affected in electric fields

The lanthanides contraction is responsible for the fact that

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Zr and Y have about the same radius

Zr and Nb have similar oxidsation state

Zr and Hf have about the same radius

Zr and Zn have the same oxidation satete

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