Question # 1

Which types of attractive forces are presentin ionic compounds.

Choose an answer

Covalent bonds

Electrostatic forces of attraction

Mtallic bonds

Coordinate covalent bonds

Identify the compound whcihis not soluble in water

Choose an answer

KBr

MgCl2

C6H6

NaCl

Activation energy of a chemical reaction must be....... the everage kinetic energy of reacting molecules.

Choose an answer

Equal to

Grether than

Lower than

None of these

Whcih Isotopes is used for diagonosis of goiter?

Choose an answer

Iodine-131

Cobalt -60

P-32

Sr-90

The colour of anhydrous cobalt(II) cholride solid

Choose an answer

White

Black

Pink

Blue

Platinum alloyed with which metal is used as catalyst in automobiles as atalytic covertor.

Choose an answer

Gold

Rhodium

Palladium

Both a and b

Mixture can be separated by means of

Choose an answer

Nuclear method

Phyical medhod

Chemical Method

All of these

40 g of H₃PO₄ contains numebr of moles

Choose an answer

0.58 g

4.8 g

5.8 g

0.408 g

How many electron are there in the valence shell of sodium atom.

Choose an answer

One

Two

Three

Four

Which of the following is an exampel of polar covalent compound.

Choose an answer

Cl2

H2

O2

HCl

Whcih law is obeyed in chemicla calculations?

Choose an answer

Law of mass action

Law of conservationof mass

Law of definite proportion

Both a and b

High concentration of which metal clogs the fish gills.

Choose an answer

Zinc

Aluminium

Sodium

Copper

Which of following is not amphoteric?

Choose an answer

H₂O

NH₃

HCO₃

SO₄

Phenolphthalein produces red colour in

Choose an answer

Acid

Base

Both a and b

None of these

Hypoglycemia result due to:

Choose an answer

high cholesterol level

low cholesterol level

low sugar level in body

high sugar level in body

Percentage of nitrogen in atmosphere is:

Choose an answer

20.94%

78.09%

0.93%

0.03%

Aromatic compounds are given this name because of;

Choose an answer

smell they have

slippery touch they have

bitter taste they have

sour taste they have

Which part of digestive system glucose absorb.

Choose an answer

Stomach

Liver

Small intestine

Large intestine.

The 1st organic compound prepared in laboratory.

Choose an answer

Urea

NaCl

Thiourea

Pyridine

Some organic compound are soluble in water due to the presence of .

Choose an answer

-OH

H⁺

Botha a and b

Covalent bond

Coal tar contains compounds

Choose an answer

Benzene

Phenol

Toluene

All

General formula of alkyl radical is

Choose an answer

C_nH_2n+2

C_nH_2n-2

C_nH_2n+1

C_nH_2n

Which statement is correct about solubility product constant.

Choose an answer

It is applicable at highly soluble substances.

Value of Kap is independent of temperature

It is used for homogeneous aquarium system

It can be used to predict that precipitation will take place or not by combining two ions

Which of the following species has unpaired electrons in antibonding molecular orbitals.

Choose an answer

O2⁺²

N2^-2

B2

F2

A solution of sucrose is 34.2% The volume of solution containing one mole of solute.

Choose an answer

500 cm3

1000 cm3

342 cm3

3420 cm3

If we want to change O₂to O₂^-1The electron is to be placed in

Choose an answer

Ice float over water because.

Choose an answer

Its structure is diamond like

Its density is maximum at 4 ^oC

It is less dense than water

It has no regular arrangement of molecules.

The number of moles of CO₂which contain 8.0 g of oxygen

Choose an answer

0.25

0.50

1.0

1.50

Chromatographic technique is very useful for

Choose an answer

Isolation

Purification

separation

All of them

One molecule of hemoglobin in heavier than one atom of hydrogen.

Choose an answer

680 times

6800 times

68000 times

680000 times

If we plot a graph between I/V at x-axis and pressure at Y -axis

Choose an answer

a parabolic graph is obtained

By increasing temperature straight line move toward x axis

By increases temperature straight line move toward y axis.

No. change in line by increasing temperature.

Molarity of pure water is

Choose an answer

1

18

55.5

6

In Daniel cell, if salt bridge is removed between the two half cells, the voltage.

Choose an answer

Drops to zero

Does not changes

Increases gradually

Increases rapidly

Which of the following is an addition polymer

Choose an answer

Polyester

Polystyrene

Nylon 6,6

Terylene

Which substance is used for denaturing of ethanol

Choose an answer

Methanol

Acetone

Pyridine

All

Most likely product formed when formic acid is dehydrated in the presence of conc. H2SO4 is.

Choose an answer

CO2 and H2O

CO, CO2 and H2O

CO2 and H2

CO and H2O

Which one of the following compounds is most abundant is nature.

Choose an answer

glucose

Starch

Cellulose

Fructose

Lactose has same molecular formula as

Choose an answer

Glucose

Fructose

Ribose

Maltose

Which of the following has highest boiling point

Choose an answer

Methanal

Ethanal

Propanal

2-hexanone

According to Lewis concept, ethers behave as

Choose an answer

Acid

Base

Nucleophile

Solvent

Which elements are deposited at the cathode during the electrolysis of brine in diaphragm cell

Choose an answer

H₂

Ba

Ra

Rn

Which class of compounds can not show positional isomerism.

Choose an answer

Alkanes

Alkene

Alkynes

Alcohol

Aluminium oxide is.

Choose an answer

Acidic oxide

Basic oxide

Amphoteric oxide

None of these

The element which is present in earth crust about 50% is

Choose an answer

Oxygen

sulphur

Carbon

Nitrogen