Question # 1

The percentage of nitrogen in urea is

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46

60

70

80

The following has zero valency

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Na

Be

AI

Kr

The ratio of the ionization energy of H and Be³⁺ is

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1 : 1

1 : 3

1 : 9

1 : 16

Which of the following has greatest reducing power?

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HI

Hbr

HCI

HI

Hess's law deals with

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Changes in heat or reaction

Rate of reaction

Equilibrium constant

Influence of pressure on volume of a gas

Which is true for an element R present in group 13 of the periodic table?

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It is a gas at room temperature

It has oxidation state of +4

It forms R₂O₃

It forms RX₂

At room temperature formaldehyde is

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Gas

Liquid

Solid

None of the above

Dilute hydrochloric acid solution cannot be concentrated by boiling beyond

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11%

33%

44%

22%

Which is not a colligative property?

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Osmotic pressure

Lowering of vapour pressure

Depression of freezing point

Elevation of boiling point

Formic acid is obtained when

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Calcium acetate is heated with conc.H₂SO₄

Calcium formate is heated with calcium acetate

Glycerol is heated with oxalic acid

Acetaldehyde is oxidized with K₂CrO₇and H₂SO₄

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fluorine

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