Question # 1

1 atm = ?

Choose an answer

1 pascal

760 mm of Hg

1 atm

1 Nm^-2

In diamonds, carbon are ____________ bonded.

Choose an answer

Tetrahedrally

Single

Double

None

Which is used for industrial manufacture of NaCI?

Choose an answer

Daniel cell

Down's cell

Nelson's cell

None of these

Bucky molecules have ________________ c-atoms.

Choose an answer

20-60

20-90

40-60

40-100

................. can be decomposed into simpler substanmce.

Choose an answer

Compound

Element

Solution

Mixture

Mark the incorrect statement about ionization energy:

Choose an answer

it is measured in Kjmol^-1

it is absorption of energy

it decreases in period

it decreases in a group

The periodic table consist of ________________ columns.

Choose an answer

Periods

Rows

Column

Nil

_________ shells of noble gases is complete.

Choose an answer

Outer most

2

1

Nil

All metals are solid except

Choose an answer

AI

Mg

Na

Hg

the homogeneous mixture of two or more substances is ____________.

Choose an answer

Solution

Stronger

Suspension

None

Atoms reacts with each other because:

Choose an answer

They are attracted to each other

they are short of electrons

they want to attain stability

they want to disperse

Water has a maximum density at .

Choose an answer

10^oC

0^oC

4^oC

100^oC

Methyl butanoate smell like.

Choose an answer

Apple

Mange

Lemon

Grapes

Which one of the following vitamins is water soluble?

Choose an answer

Vitamin A

Vitamin C

Vitamin D

Vitamin E

Clark's method is used to remove the hardness of water, in this method which is used.

Choose an answer

Ca(HCO₃)₂

Na-Zeolite

Ca-Zeolite

Ca(OH)₂

Which of one of the following is used as as fumigant:

Choose an answer

Ethyl alcohol

ethylene oxide

ethylene glycol

diethyl ether

Which is Pentahydroxy aldehydes of the following?

Choose an answer

Starch

Glucose

Fructose

Sucrose

A base is a substance which neutralizes an acid which of these substances is not a base?

Choose an answer

Aqueous ammonia

Sodium chloride

Sodium Hydroxide

Calcium Hydroxide

Rapid growth of algae in water bodies in because of detergent having.

Choose an answer

Carbonat salt

Sulphonic acid

Sulphat salt

Phosphate salt

Which one of the ore of copper?

Choose an answer

Copper glance

Chalcopyrite

Both a and b

None of these

Number of discovered element till today are.

Choose an answer

140

118

90

16

Formula of acetaldehyde is:

Choose an answer

The sum of pH and pOH is

Choose an answer

0

7

14

10

If strip of Cu metal is placed in the solution of FeSO4

Choose an answer

Cu will be precipitated out

Fe is precipitated out

Cu and Fe both dissolves

No reaction takes place

Which of the following will have the same number of molecules at STP

Choose an answer

280 cm³of CO₂and 280 cm³of N₂O

11.2 dm³of O₂and 32 g of O₂

44 g of CO₂and 11.2 dm³of CO

28 g of N₂and 5.6 dm³of oxygen

A molecule has two ions pairs and two bond pairs around the central atom. The shape of molecule is.

Choose an answer

Linear

Pyramidal

Angular

Tetrahedral

The Number of moles of CO2 which contain 8.0 of oxygen.

Choose an answer

0.25

0.15

0.35

1.45

Almost forward reaction is complete when value of Kc is

Choose an answer

very high

Very small

Neither large nor very small

No correlation

In silver oxide battery, the cathode is mad up of.

Choose an answer

AgO

Ag2O

Ag2O3

Ag

In methanol, bond between carbon and oxygen.

Choose an answer

Ionic

Non polar

Polar

Co - ordinate

The net heat change in a chemical reaction is same whether it is brought about in two or more different ways in one or several steps. It is knnown as

Choose an answer

Henry's law

Hess's law

Joule's principle

Law of combustion

The voltage Nickel Cadmium cell is

Choose an answer

1 V

1.2 V

1.4 V

1.6 V

Which of the following elements in its crystalline form will have the lowest enthalpy change of vaporization

Choose an answer

Chlorine

Argon

Phosphorus

Silicon

Which is more basic

Choose an answer

RbOH

NaOH

KOH

Li OH

Which one is primary pollutant.

Choose an answer

Peroxyacetyl nitrate

Sulphuric acid

Carbonic acid

Carbon monoxide

Thickness of the atmosphere is

Choose an answer

100 km

500 km

1000 km

1500 km

Linear shape is associated with set of hybrid orbitals

Choose an answer

SP

sp²

dsp²

sp³

Conversion of ammonium carbamate into urea is

Choose an answer

Hydrolysis

Hydrogenation

Hydration

Dehydration

Lactose has same molecular formula as

Choose an answer

Glucose

Fructose

Ribose

Maltose

Micronutrients are required in quantity ranging from

Choose an answer

4g-40g

6g-200g

6kg-200kg

4kg-40kg

Which one of the following substances have garlic odour and a colourless gas.

Choose an answer

CH3OH

HCOOH

CH2=CH2

HC= CH

Which hydride is intermediate in nature.

Choose an answer

NaH

BeH2

NH3

HCl

An ester can be prepared by the reaction of.

Choose an answer

Two alcohols

Alcohol and an aldehyde

An alcohol and an organic acid

an acid and a ketone

What are the total numbers of periods in the modern periodic table.

Choose an answer

3

5

7

8