Question # 1

A molecule which contains two lone pairs and two bond pairs of electrons in valence shell of central atom, geometrical shape of molecules will be

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Tetrahedral

Trigonal pyramidal

Angular

Linear

Three elements needed for the healthy growth of plants are

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N P K

N K C

N S P

N Ca P

For an endothermic reaction, enthalpy of reactants

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Is smaller than that of the products

Is greater than that of the products

Must be greater or smaller than that of the products

Is equal to that of the products

Enzymes are chemically

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carbohydrates

proteins

fatty acids

phospholipids

The protein component of enzyme ls called

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apoenzyme

proenzyme

holoenyme

co-enzyme

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

Which of the following metal does not liberate hydrogen on reaction with acid?

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Mg

Pt

Zn

Ca

Boiling point of water is higher (100°C) than that of ethanol (78.5°C) although both have hydrogen bonding. This is because

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water molecules are closely packed

water is more acidic than ethanol

ethanol is an organic liquid

number of hydrogen bonds are more in H₂O

Type of polymer formed by the polymerization of two monomers is:

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homopolymer

copolymer

ter polymer

All of these

All the following have crystals except:

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potassium bromide

diamond

cadmium sulphide

sodium chloride

One mole of a gas refers to

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The number of molecules in one litre of gas

The number of molecules in one gram of gas

The number of molecules contained in 12 grams of ¹²C isotope

The number of molecules in 22.4 liters of a gas at S.T.P.

Carboxylic acids are more acidic than pehnol and alcohol because of

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Intermolecular hydrogen bonding

Formation of dimmers

Highly acidic hydrogen

Resonance stabilization of their conjugate base

The digestion of fats in the intestines is aided by

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Diffusion

Protection

Peptization

Emulsification

ΔH for an endothermic reaction carries

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Positive sign

Negative sign

Both sign

None of these

Which compound was recognized the parent member of aromatic compounds

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Aniline

Phenol

Benzene

Toluene

Smallest charge of electricity that has been measured so far is

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Charge on a-rays

Charge on electron (1.602 x 10^-19C)

Charge on x-rays

Charge on gamma rays

Organic acid without a carboxylic acid group is

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Ascorbic acid

Vinegar

Oxalic acid

Picric acid

Formula of acetone is:

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HCHO

CH₃CHO

CH₃OCH₃

CH₃OC₂H₅

The high molecular weight materials which yield on hydrolysis the amino acids is called:

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Carbohydrates

Lipids

Fatty acids

Proteins

If the standard electrode potential of CU²⁺/Cu electrode is 0.34 V, what is the electrode potential of 0.01 M concentration of Cu²⁺? (T=298)

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0.399 V

0.281 V

0.222 V

0.176 V

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450°C

250°C

850°C

1000°C

Hemoglobin is 68000 times heavier than:

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Oxygen atom

Nitrogen atom

Carbon atom

Hydrogen atom

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