Question # 1

Al is more reactive than Fe but Al is less easily corroded than Fe because

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It is a noble metal

oxygen forms a protective reaction easily with water

Iron undergoes reaction easily with water

Fe form mono and divalent ions.

Which of the following has no tin in its composition?

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Solder

Bronze

Brass

Tin stone

Gooch crucible is used for the filtration of precipitates having

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High Solubility

High concentration

High ignition temperature

Low Temperature

In public urinals, we observe some nascent smell. This smell is due to

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Hydrolysis of urea of urine by urease of atmosphere into NH₃and CO₂

Formation of sulphonic acid by urea of urine

Reaction of CO₂of atmosphere with urea mononitrate in urine

Hydregen present in air reacts with nitrogen forming NH₃

The number of oxygen atoms in 4.4 g of CO₂is approximately

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1.2 x 10²³

6 x 10²²

6 x 10²³

12 x 10²³

Which one is primary alcohol?

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Buten-2-ol

Propan-2-ol

Butaon-1-ol

2, 3-Dimethylhexane-4-ol

The maximum number of electrons in a subshell for whichι = 3 is

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14

10

8

4

Octane number can be changed by

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Isomerisation

alkylation

Cyclisation

All of these

Alum is not used

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As a mordant in dyeing

As an insecticide

In purification of water

In tanning of leather

Which of the following halogens does not form its oxyacids?

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F

Cl

Br

I

Hypo is used to photography for

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Developing picture

Picture printed

The colour of picture

The fixation of picture

Gooch Crucible used to filter the solution of

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H₂SO₄

HCI

KMnO₄

Both B & C

When KClO₃is heated, it decomposes into KCl and O_{2. If some MnO2 is added, the reaction goes much faster because}

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MnO₂decomposes to give O₂

MnO₂provide heat by reacting

Better contact is provided by MnO₂

MnO₂acts as a catalyst.

Which of the following statements is correct with respect to the property of elements with increase in atomic number in the carbon family (group 14)?

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Their metallic character decreases

The stability of +2 oxidation state increases

Their ionization energy increases

Their atomic size decreases

Tollen's reagent is

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Ammonical cuprous chloride

Ammonical cuprous oxide

Ammonical silver bromide

Ammonical silver nitrate

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