Question # 1

Which of the following species is ortho and para director.

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CHO

SO3H

NO2

Cl

Across a period from left to right in the periodic table, the melting and boiling point.

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Decrease

Increase

Remain constant

First increase upto the middle of period and then decrease

In group VA elements the most electronegative elements is.

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Sb

N

P

As

Laughing gas is chemically

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NO

NO₂

N₂O

N₄O₄

Sodalime is

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NaOH

Mixture of Na and Ca(OH)2

KOH

Mixture of CaO and NaOH

All of the following tests are used to identify aldehydes except.

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Tollen's test

Fehling test

Baeyer's test

Benedict test

In which ore carbon is present

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Magnesite

Epsom salt

Barite

Sylvite

Which field produces significant amount of methane in the atmosphere

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paddy field

Cotton field

Can sugar field

Wheat field

Galvanized iron is protected by a thin layer of

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Cr

Zn

Sn

Pb

Bleaching powder may be produced by passing chlorine over

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calcium carbonate

hydrated calcium sulphate

calcium hydroxide

magnesium hydroxide

Which nitrogen fertilizer make the soil acdic.

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Calcium nitrate

sodium nitrate

Potassium nitrate

Ammonium nitrate

Stability of halogen molecules decreases from

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F2 to I1

Cl2 to I2

I2 to F2

I2 to Cl2

Iodine deficiency in diet is known to cause.

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Beri Beri

Goiter

Rickets

Night blindness

S_N2 mechanism involves

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1st order kinetics

2nd order kinetics

3rd kinetics

zero order kinetics

Bleaching powder contains available chlorine approximately

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100%

70-80%

35-40%

10-20%

Setting of Plaster of Paris is accompanied with

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Hydrogen bonding

Hydration

Dehydration

None of these

Aluminum reacts with nitrogen to form

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AIN

Al₂N

Al₂N₃

Al₄N₆

In which compound, the oxidation state of boron in not +3

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H2BO3

Ca2B2O11

Na2B4O7

Mg3B2

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