Question # 1

Which reagent is responsible for the conversion of ketone to secondar alcohul

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NaAlH

NaBH4

Al

Red P

Silk is an example of:

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animal fiber

vegetable fiber

mineral fiber

none of all

A molecule of polysaccharide hydrolysis produces __________ molecules of:

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2

3

2-10

100

How magnesium reacts with water?

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In frozen ice water

With cold water

In with steam

In hot state

The temperature of a gas is directly proportional to its

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average translational kinetic energy

enthalpy

internal energy

hydration energy

Which is not considered as pollutant

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O₃

CO₂

NO₂

SO₂

Large molecule formed by combination of smaller units these smaller units are called:

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Polymers

Macromolecule

Micromolecule

a & b

The starting substance for the preparation of iodoform is any of the following, except

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СН3СН(ОН)CН3

CH3CH2ОН

HCH2OH

CH3COCH3

On adding NH3 to water

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lonic product will increase

[H3O+] will inerease

lonic product will decrease

[H3O+] will decrease

The reagent for alkaline hydrolysis of ethyl bromide to form ethyl alcohol is

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water at room T

Alcoholic KOH+heat

Ethanol + heat

dil. NaOH+ heat

A polymeric substance that is formed in the liquid state and then hardened to a liquid solid us called as:

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Fibre

Plastic

Varnish

Polyamide resin

The organic compounds containing Ph--OH group are called:

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Phenol

Aldehyde

Ketones

Carboxylic acids

Atmosphere thickness is (in km) around the earth:

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10 km

100 km

1000 km

1500 km

I-Phenylethanol can be prepared by reaction of benzaldehyde with

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Methyl iodide an Magnesium

Methyl bromide

Methyl bromide and AIBr₃

C₂H₅l and Mg

Identify the incorrect statement with respect to ozone

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Ozone is formed in the upper atmosphere by a photochemical reaction involving dioxygen

Ozone is more reactive than diaoxygen

Ozone is diamagnetic whereas dioxygen is paramagnetic

Ozone protects the earth's inhabitants by absorbing gamma-radiations

In the modern long form of the periodic table elements are arranged in the increasing order of

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Atomic mass

Atomic number

Mass number

Isotopic number

A molecule in which sp²hybrid orbitals are used by the central atom in forming covalent bonds in

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He₂

SO₂

PCl₅

N₂

How many cm³of 1 M H₂SO₄required to neutralize 10 cm³of 1 M NaOH

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2 cm³

2.5 cm³

5 cm³

10 cm³

Equal volumes of ethylene glycol (molar mass = 62) and water (molar mass = 18) are mixed. The depression in freezing point of water is (given K_rof water = 1.86 K mol^-1kg and specific gravity of ethylene glycol is 1.11)

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0.003

3.33

0.333

33.3

Which three elements are needed for the healthy growth of plants

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N, S, P

N, Ca, P

N, P, K

N, K, C

Photochemical smog is caused by

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CO

CO₂

O₃

NO₂

A solution has pH = 0, its H⁺ion concentration is

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1 x 10^-14

1 x 10¹⁴

1 x 10¹

1

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