Chemistry-Chemistry MCQ Questions Se/9 Sample Test,Sample questions

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Question: 
An atom that loses or gains electrons is called

1.Proton

2.Ion

3.Isotope

4.Neutron

Question: 
An electron loses potential energy when it

1.shifts to a more electronegative atom.

2.increases its kinetic energy.

3.shifts to a less electronegative atom.

4. increases its activity as an oxidizing agent.

Question: 
An element with an atomic number of ___ will form a basic oxide.

1.20

2.7

3.6

4.17

Question: 
Arrange the following compounds in order of increasing acidity?

1.o-cresol < phenol < o-nitrophtenol

2. phenol < o-nitrophtenol < o-cresol

3.o-nitrophtenol < o-cresol < phenol

4.None of the above

Question: 
Atoms have no electric charge because they

1.have same number of electrons and neutrons

2.have same number of electrons and protons

3.have same number of protons and neutrons

4.have same number of protons, electrons and neutrons

Question: 
Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water

1.Magnesium

2.Calcium

3.Manganese

4.Chromium

Question: 
Brownish film formed on iron when left in open is called?

1.Dust

2.Shovel

3.Spade

4.Rust

Question: 
Constantan is an alloy of copper and _______.

1.aluminium

2.tin

3.nickel

4.iron

Question: 
German Silver contains

1.100% pure silver

2.10% silver

3.1% silver

4.0% silver

Question: 
Infiltration is the process by which rainwater becomes

1.river water

2.ground water

3. salt water

4.ocean water

Question: 
Isotopes are atoms of the same element that have different

1. mass numbers

2. atomic numbers

3.protons

4. All of the above

Question: 
Liquid sodium is being considered as

1.engine coolant

2. bleaching agent

3.antiseptic

4.None of the above

Question: 
Metals that are liquid at room temperature?

1.Caesium

2.Gallium

3.Rubidium

4.Mercury

Question: 
Name the densest stable element known on earth.

1.Osmium

2.Rhodium

3.Aluminium

4.Tungsten

Question: 
Process of gaining electrons is known as _____.

1.oxidation

2.reduction

3.radiation

4.both oxidation and reduction

Question: 
Stoichiometry is based on

1.Law of conservation of energy

2. Law of conservation of mass

3. Newton's 1st law

4.Kepler's law

Question: 
Tertiary sewage treatment is designed to remove

1.Calcium and Phosphorous

2.Nitrogen and Calcium

3.Phosphorous and Nitrogen

4. Calcium and Nitrogen

Question: 
The chemical name of common salt is

1.Calcium Chloride

2. Potassium Chloride

3.Sodium Chloride

4.Magnesium Chloride

Question: 
The chemical name of common salt is

1.Sodium Chloride

2.Potassium Nitrate

3.Sodium Nitrate

4.Potassium Chloride

Question: 
The element present in all organic molecules is

1.Hydrogen

2.Oxygen

3.Carbon

4.None of the above

Question: 
The mass of a mole of NaCl is the

1.58.44 gm/mol

2.57.25 gm/mol

3. 56.31 gm/mol

4. 59.14 gm/mol

Question: 
The number of electron levels in a magnesium atom is

1.3

2.2

3.1

4.0

Question: 
The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its ___________.

1.Crystallisation

2.Crystallisation

3.Evaporation

4.Evaporation

Question: 
Uranium found in Ladakh is an example of which type of resource?

1.unnatural resources

2. Actual resources

3.Potential resources

4. Biotic resources

Question: 
What element is used to disinfect swimming pools?

1.Fluorine

2.Chlorine

3.Bromine

4.Sulphur

Question: 
What types of atoms form covalent bonds?

1.metal and metal

2.metal and non metal

3.non metal and non metal

4.All of the above

Question: 
When a chemical bond is broken energy is

1.transferred

2.released

3.used

4.None of the above

Question: 
Which  one  of  the  following  statements  is not correct?

1.The cathode rays originate from cathode and proceed towards the anode in a cathode-ray discharge tube.

2.The television picture tubes are nothing but cathode ray tubes.

3.The cathode rays themselves are not visible.

4. The characteristics of cathode rays depend upon the nature of the gas present in the cathode-ray tube.

Question: 
Which among the following is false about alpha particles?

1.They have high ionizing power

2.They have high penetrating power

3.They have high kinetic energy

4.They are positively charged helium nuclei

Question: 
Which are two chemicals used to purify water?

1.Chlorine & Fluorine

2.Fluorine & Iodine

3.Chlorine & Hydrogen peroxide

4. Fluorine & Iodine

Question: 
Which base is present in soap?

1.Sodium hydroxide

2.Silicon dioxide

3.Calcium hydroxide

4.Ammonium hydroxide

Question: 
Which compound is an electrolyte?

1.HCl

2.NaCl

3.HBr

4.All of the above

Question: 
Which equation is an example of a synthesis reaction?

1.2H2 + O2 ? 2H2O

2.Na + Cl ? NaCl

3.HA + BOH ? H2O + BA

4.NaCl + AgNO3 ? NaNO3 + AgCl

Question: 
Which has the lowest freezing point?

1.Mercury

2.Helium

3.Cesium

4.Aluminium

Question: 
Which is not a green house gas in the following?

1.Ozone

2.Nitrous oxide

3.Water vapour

4.Hydrogen

Question: 
Which molecule is nonpolar and has a symmetrical shape?

1.NH3

2.HCl

3.H2O

4.CH4

Question: 
Which of the following is NOT a nucleon?

1.Proton

2.Electron

3.Neutron

4.No option is correct

Question: 
Which of the following is NOT a waste material removed from blood in the kidney?

1.Ammonia

2.Carbon dioxide

3.Urea

4. Uric acid

Question: 
Which of the statement(s) about the reaction given below is/are INCORRECT?

 

2PbO (s) + C (s) ? 2Pb (s) + CO2 (g)

 

I. Lead is getting reduced.

II. Carbon is getting reduced.

III. Lead oxide is getting reduced.

1. Only I and II

2.Only I and III

3. Only II and III

4. All I, II and III

Question: 
Which one of the following elements is essential for the formation of chlorophyll in green plants?

1.Calcium

2.Iron

3.Magnesium

4.Potassium

Question: 
Which one of the following elements is used as a timekeeper in atomic clocks?

1.Potassium

2.Caesium

3.Calcium

4.Magnesium

Question: 
Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?

1.Element with 18 neutrons and 20 protons

2.Element with 19 neutrons and 18 protons

3. Element with 19 neutrons and 20 protons

4. Element with 18 neutrons and 22 neutrons

Question: 
Which one of the following is a physical change?

1.Burning of coal

2.Burning of wood

3.Heating of a platinum crucible

4. Heating of potassium chlorate

Question: 
Which properties are characteristic of the group 1 metals?

1.Low melting points

2.Produce hydrogen when react with water

3.Soft in nature

4.All of the above

Question: 
Which scientist established the Law of Octaves?

1.John Newlands

2.Antoine Lavoisier

3.Alfred Nobel

4.Marie Curie

Question: 
Which type of bond is found in sodium bromide?

1.Ionic

2.Covalent

3.Polar covalent

4.None of the above

Question: 
Why is argon gas used along with tungsten wire in an electric bulb?

1.To increase the life of the bulb

2.To reduce the consumption of electricity

3.To make the emitted light colored

4.To reduce the cost of the bulb

Question: 
______ gets converted to phosgene, when exposed to sunlight.

1.Chloroform

2.Acetone

3.Benzene

4.Propylene

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