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Chemistry 9 icse > Revision > Flashcards

Revision Flashcards

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1
Q

The universal solvent

A

water

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2
Q

A homogeneous mixture of solute in a solvent

A

solution

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3
Q

A solution in which the amount of solute is relatively large

A

concentrated solution

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4
Q

what is the nature of true solution?

A

it is clear, transparent and homogeneous

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5
Q

The 3 metals which can react with cold water to produce HYDROGEN

A

K, Na, Ca

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6
Q

The metal which reacts reversibly with steam to produce HYDROGEN

A

IRON

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7
Q

Which of the foloowing does not give hydrogen on reacting with dilute HCl?
Cu, Zn, Fe, Mg

A

Copper

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8
Q

Potassium is kept in kerosene oil because

A

It reacts with the moisture in air and catches fire

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9
Q

1 atm is qual to ______ torr

A

760 torr

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10
Q

At high altitude atmospheric pressure is _____

A

low

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11
Q

Pressure -temperature relationship is given by

A

Charles law

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12
Q

If pressure is doubled for a fixed mass of a gas, volume will become

A

half times

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13
Q

What is the physical state of bromine?

A

liquid

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14
Q

how many electrons are present in the outermost orbit of alkaline earth metals?

A

two

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15
Q

Which element of group 17 is solid in nature?

A

iodine

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16
Q

down the group metallic character :

A

increases

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17
Q

Respiration is an example of which type of reaction? exothermic or endothermic?

A

exothermic

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18
Q

Name the acid that is released when a bee stung our body

A

formic acid

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19
Q

Name the least reactive element among halogens

A

iodine

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20
Q

The products obtained by thermal decomposition of Calcium carbonate

A

Calcium oxide and carbon dioxide

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21
Q

How many physical states of water exist?

A

3

22
Q

chemical formula of Glauber’s salt

A

Na2SO4.10H2O

23
Q

The acid used in drying of gases

A

conc H2SO4

24
Q

with the rise in temperature the solubility of sodium chloride in water:

A

increases only a little

25
Q

The mass ratio of Hydrogen to oxygen in water

A

1:8

26
Q

The catalyst and the promotor used for the formation of ammonia gas is:

A

Fe and Mo respectively

27
Q

When crystals of lead nitrate are heated strongly in a dry test tube, a ______colour residue is left

A

yellow

28
Q

The salt that undergoes photchemical decomposition is

A

silver nitrate

29
Q

A subsatnce that does not contain water of crystallization is
salts: blue vitriol, washing soda crystals, common salt and Glauber’s salt

A

common salt

30
Q

Ferric chloride is ______ salt

A

deliquescent

31
Q

How many electrons do the outermost shell of an atom accommodate?

A

8

32
Q

Which of the following is a covalent compound?

sodium chloride, carbon tetrachloride, magnesium chloride, calcium chloride

A

carbon tetrachloride

33
Q

The bond formed between nitrogen atoms in a molecule is :

A

Triple covalent bond

34
Q

Calcium is not used in laboratory preparation of hydrogen because:

A

It is very expensive

35
Q

Which metal is given hydrogen on reacting with water, acid and alkali?
Fe,Mg, Zn, Pb

A

Zinc

36
Q

Nitric acid is not used in the preparation of hydrogen from metals. Why?

A

It is a powerful oxidising agent and oxidizes the the hydrogen formed to water

37
Q

Two metals which can react with very dilute HNO3 at low tempeartures

A

Mg and Mn

38
Q

What willl be the minimum pressure required to compress 2L of gas at 1 bar to 1L at 25°C

A

2 bar

39
Q

The absolute temperature that corresponds to 26°C

A

299K

40
Q

On adding water to sodium the solution formed is

A

alkaline

41
Q

The gas which has rotten egg smell

A

H2S

42
Q

Hydrogen is collected through ____________________ method

A

Water displacement method

43
Q

Name : The substance that can remove combined elements of water in the ratio of 2:1 ( H and O) from a compound.

A

Dehydrating agent

44
Q

Elements of group IIIB ( gp no. 3) of the seventh period.

A

Actinides

45
Q

Elements that have two outermost shells incomplete

A

Transition elements

46
Q

The process in which an atom or ion loses electron

A

oxidation

47
Q

A substance that transfers hydrogen to another substance, or removes oxygen from that substance

A

Reducing agent

48
Q

The force that a gas exerts in unit cross-sectional area on the walls of its container

A

Pressure

49
Q

The process of gradual mixing of two substances kept in contact by molecular motion

A

diffusion

50
Q

The elements of lanthanides and actinides collectively known as

A

Inner transition elements

Chemistry 9 icse (7 decks)

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