Question # 1

Which one of the following is heterogeneous mixture?

Choose an answer

milk

ink

milk of magnesia

sugar solution

Which one of the following pair has the same mass?

Choose an answer

1 mole of CO and 1 mole of N₂

1 mole of CO and 1 mole of CO₂

1 mole of O₂ and 1 mole of N₂

1 mole of O₂ and 1 mole of CO₂

________________ elements were discovered in year 1800.

Choose an answer

34

35

36

37

The escape of gaseous molecules one by one is called ____________.

Choose an answer

Diffusion

Effusion

A & b

Nil

Identify when pair has polar covalent bonds:

Choose an answer

O₂ and Cl₂

H₂O and N₂

H₂O and C₂H₂

H₂O and HCI

The mathematical formula of Charle's law is:

Choose an answer

PV = k

V/T = k

P = VT

T/V = k

Reduction means

Choose an answer

Removal of H2

Removal of electrons

Gain of electrons

Gain of O2

Transfer of electrons between atoms results in:

Choose an answer

metallic bonding

ionic bonding

covalent bonding

coordinate covalent bonding

1 atm = ?

Choose an answer

1 pascal

760 mm of Hg

1 atm

1 Nm^-2

Which one is not a property of electrolytic cell?

Choose an answer

It consists of one complete cell

Anode has +ve charge

It converts electrical energy into chemical one

Anode has -ve charge

The isotopes of an element have different number of

Choose an answer

Electrons

Protons

Neutrons

Protons & Neutrons

Which one of these is a saturated hydrocarbon?

Choose an answer

C₂H₄

C₃H₆

C₄H₈

C₅H₁₂

In the troposphere (lowest layer), the temperature decreases form 17°C to;

Choose an answer

-58°C

-93°C

-61°C

-49°C

Thermosphere lies beyond.

Choose an answer

Stratosphere

Troposphere

Mesosphere

Biosphere

At which temperature o water shows mxamimum density.

Choose an answer

0 ^oC

100^oC

4^oC

-4^oC

Which gas is used to prepare ammonia?

Choose an answer

N₂

O₂

Cl₂

S

Which is not a part of flue gas?

Choose an answer

Furans

Dioxins

HCl

H₂SO₄

When HCl and KOH is reacted the salt formed is.

Choose an answer

Acidic

Basic

Normal

Complex

Which is disaccharide?

Choose an answer

Glucose

Fructose

Sucrose

Starch

Which carbohydrate is used directly by muscles for energy?

Choose an answer

Galactose

Lactos

Glucose

Fructose

The reaction in which the products do not recombine to form reactants are called.

Choose an answer

Inversible reactions

Reversible reaction

Decomposition

Addition

Which one of the following is gas at room temperature:

Choose an answer

C2H6

C6H14

C6H6

C8H18

If an endothermic reaction is allowed to take place very rapidly in the air, the temperature of the surrounding air

Choose an answer

Remains constant

Increase

Decrease

Increase a bit

Weak intermolecular forces are present in.

Choose an answer

Only gases

Only liquid

Only solids

gases, liquids and solids

When concentration of one product is removed at equilibrium stage, in which direction it moves to reestablish equilibrium.

Choose an answer

Forward

Reverse

Neither forward nor reverse

Equally move in both direction

Chlorine atom and chloride Cl- ions

Choose an answer

Have same chemical and physical properties

Are allotropes of chlorine

Have same number of electrons

Have same number of proton

The Avogadro constant is the number of.

Choose an answer

Atoms in 1 g of helium ga

Molecules in 35.5 g of chlorine gas

Atoms in 6 h graphite

Atoms in 24 g of magnesium

Which one of the following methods will be used to separate the mixture of NaCl and sand.

Choose an answer

Chromatography

Solvent extraction

Sublimation

Filtration

If the salt bridge is not used between two half cells, then the voltage.

Choose an answer

Decrease rapidly

Decrease slowly

Drops to zero

Does not change

The spreading of fragrance of a rose or scent in air is due to.

Choose an answer

Effusion

Diffusion

Osmosis

Evaporation

Which one of the following gases diffuse more rapidly.

Choose an answer

Cl2

CO2

CH4

N2

If the number of gas molecules are doubled in a certain volume of a gas, the pressure is.

Choose an answer

Decreased to half

Doubled

Increased to four time

Remains unchanged

Which of the following is true for ionic compounds

Choose an answer

They are non-electrolytes in the molten state

They have bonds which are directional

They conduct electricity in solid state

They are generally more soluble in polar solvents than in non-polar solvents

Prilling is a process in which

Choose an answer

Concentration of urea is increased

Water is removed from urea

Molten urea is converted to solid drop

Some other ingredients are added to urea

Which one of the following alcohols will be formed when ethyl magnesium bromide reacts with acetone.

Choose an answer

Primary alcohol

Secondary alcohol

Tertiary alcohol

Dehydrin alcohol

Which of the following is not directly prepared from CH₃COOH

Choose an answer

Ethyl acetate

Acetyl chloride

Acetic anhydride

Acetamide

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

Choose an answer

Oxygen

sulphur

Carbon

Nitrogen

When carbon di oxide is bubbled through lime water, white precipitate is formed This precipitate is.

Choose an answer

COCl2

H2CO3

CaO

CaCO3

Geometrical shape of [CO(NH3)6Cl3

Choose an answer

linear

square planar

Octahedral

Trigonal hypyramid

Which of the following is an ester.

Choose an answer

Soap

Starch

PVC

Dacron

Which of the following compounds is used to make spray, which has fungicidal action.

Choose an answer

BaSO4

Na2CO3

CaO

CaSO4.2H2O

The strength of binding energy of transition elements depends upon

Choose an answer

number of electron pairs

number of unpaired electron pairs

number of neutrons

number of protons

Which substance reacts with sodium nitroprusside.

Choose an answer

Ethanol

Acetaldehyde

Dimethyl ketone

Methanol

The general formula for Alkanes is

Choose an answer

C_nH_2n+1

C_nH_2n

C_nH_2n-2

C_nH_2n+2