A compound having molecular formula CgHi40, and empirical formula C3H,O3, value of n is ______________
1.1
2.2
3.3
4.4
Posted Date:-2022-01-12 09:12:30
A solid has properties like high boiling point, high melting point, hard, soluble in polar solvents. Which type of solid is this ?
1. Ionic solid
2.Covalent solid
3.Coordinate bond
4.All
Posted Date:-2022-01-12 09:07:39
An example of salt formed by a base and an acid is...........
1.Sodium chloride
2.Calciurn sulphat
3.Lithium chloride
4.Sodium chloride
Posted Date:-2022-01-12 09:29:39
An example of salt formed by a metal and an acid is ________________.
1.Sodium chloride
2.Calcium sulphate
3.Lithium chloride
4.Sodium chlorate
Posted Date:-2022-01-12 10:20:24
How many electrons are gained or lost by calcium to attain nearest noble gas configuration?
1.2 electrons gain
2.2 electrons lost
3.3 electrons gain
4.3 electrons lost
Posted Date:-2022-01-12 09:17:45
How pH of a neutral solution be increased ?
1.By adding acid
2.By adding alkali
3.Both 1 and 2
4.None of these
Posted Date:-2022-01-12 09:27:40
Hydrogen chloride molecule contains:
1.polar covlent bond
2.Double bond
3.Coordinate bond
4.Electrovalent bond
Posted Date:-2022-01-12 10:24:19
Hydroxide of this metal is soluble in sodium hydroxide solution :
1.Magnesium
2.Lead
3.Silver
4.Copper
Posted Date:-2022-01-12 10:51:59
Identify the following "A yellow monoxide that dissolves in hot and concentrated caustic alkali".
1.CuO
2.ZnO
3.PbO
4.None of these
Posted Date:-2022-01-12 09:26:48
If a solution liberates carbon dioxidide on reaction with sodium carbonate its pH is_______________.
1.Lower than 7
2.More than 7
3. Equal to 7
4.Zero
Posted Date:-2022-01-12 09:16:52
If the colour of litmus changes from red to blue, the pH of solution will be ?
1.Lower than 7
2.More than 7
3.Equal to 7
4.Zero
Posted Date:-2022-01-12 09:01:46
In which period of the periodic table, an element with atomic number 14 is placed
1.4
2.3
3.2
4.1
Posted Date:-2022-01-12 09:21:25
In which period of the periodic table, an element with atomic number 14 is placed?
1.4
2.3
3.2
4.1
Posted Date:-2022-01-12 10:12:28
The cathode production of the electrolysis of zinc iodide is:
1.lodine
2.Zinc
3.Zinc oxide
4.Chloride
Posted Date:-2022-01-12 10:56:57
The electrode at which reduction occurs is:
1.Anode
2.Cathode
3.Both 1 and 2
4.None of these
Posted Date:-2022-01-12 09:09:59
The electrolysis to acidified water is an example of:
1.reduction
2.Oxidation
3.redox reaction
4.catalytic reaction
Posted Date:-2022-01-12 14:16:23
The gas liberated when sodiunm sulphite reacts with dilute sulphuric acid:
1. Carbon dioxide
2.Hydrogen
3.Hydrogen sulphide
4.Sulphur dioxide
Posted Date:-2022-01-12 10:26:33
The ratio of certain mass of a gas or vapour to the mass of same volume of hydrogen is it's
1.Vapour density
2.Empirical formula
3.Molecular formula
4.Percentage composition
Posted Date:-2022-01-12 14:40:38
The value of second ionisation energy is _________________ than first ionisation energy.
1.more
2.less
3.same
4.none of these
Posted Date:-2022-01-12 08:57:32
The vapour density of an element is 14. Calculate is molecular mass.
1.14
2.7
3.28
4.Infinite
Posted Date:-2022-01-12 08:59:07
Vapour density of a gas is 22. What is its molecular mass ?
1.23
2.22
3.44
4.11
Posted Date:-2022-01-12 10:52:54
What happens to pale blue ppt. obtained when ammonia solution is added to copper sulphate solution on addition of excess of alkali?
1.Ppt. is soluble
2.Ppt. is insoluble
3.No effect on ppt.
4.Sparingly soluble
Posted Date:-2022-01-12 10:14:49
What is the colour of aluminium salts?
1.Red
2.Green
3.White
4.Colourless
Posted Date:-2022-01-12 09:00:04
What is the colour of NaOH in Phenolphthalein
1.Red
2.Blue
3.Green
4.Pink
Posted Date:-2022-01-12 09:08:39
What is the valency of Z ?
1.1
2.2
3.3
4.4
Posted Date:-2022-01-12 14:54:13
What will be the colour of precipitate obtained when NaOH solution is added to iron (ll) sulphate solution ?
1.Red
2.Green
3.White
4..Colourless
Posted Date:-2022-01-12 09:15:25
What will be the empirical formula of a compound if the percentage of elements present is A= 39.56%, B = 7.74%, C = 52.72% ? ( Atomic mass of A= 12, B= 1, C= 16)
1.ABC
2.AgBC
3.A6B7C3
4.A3B3C6
Posted Date:-2022-01-12 09:25:33
Which element belongs to the second Period ?
1.X
2.Y
3.Z
4.None of these
Posted Date:-2022-01-12 14:42:46
Which is a metal ?
1.X
2.Y
3.Z
4.all of the these
Posted Date:-2022-01-12 14:55:06
Which of the conditions are necessary for the formation of ionic bond ?
1.Low ionisation energy
2.High electron affinity
3.High lattice energy
4.All the above
Posted Date:-2022-01-12 09:18:53
Which of the following is an example of covalent band ?
1.Calcium oxide
2.Water
3.Ammonia
4.Sodium chloride
Posted Date:-2022-01-12 10:10:25
Which of the following is equal to number of electrons in the valence shell?
1.Atomic mass
2. Group number
3.Period number
4.Atomic volume
Posted Date:-2022-01-12 09:20:00
Which of the following is least reactive:
1.F
2.Br
3.CI
4.I
Posted Date:-2022-01-12 10:13:28
Which of the following is not true for electrolysis of NaCI?
1.Oxidation occurs in Na
2.Reduction occurs at CI
3.Oxidation takes place at cathode
4.It is a redox reaction.
Posted Date:-2022-01-12 09:10:46
Which of the following is present in pure water ?
1.Ions
2.Molecules
3.Atoms
4.None of these
Posted Date:-2022-01-12 08:58:21
Which of the following is true when lead nitrate is treated with sodium hydroxide solution, and Ppt. obtained is dissolved in excess of alkali
1.White ppt. soluble in excess of alkali
2.White ppt. insoluble in excess of alkali
3.Green ppt. soluble in excess of alkali
4.Green ppt. insoluble in excess of alkali
Posted Date:-2022-01-12 10:18:43
Which one of them is a noble gas ?
1.X
2.Y
3.Z
4.None of these
Posted Date:-2022-01-12 14:53:25
Which process occur in electropositive ion ?
1.Oxidation
2.Reduction
3.Both 1 and 2
4.None of these
Posted Date:-2022-01-12 10:11:41
Which process occur in electropositive ion ?
1.Oxidation
2.Reduction
3.Both I and 2
4.None of these
Posted Date:-2022-01-12 10:21:46
_____________the chemical change that occurs at this electrode is called.____________
1.Anode. oxidation
2.Anode, reduction
3.Cathode, oxidation
4.Cathode, reduction
Posted Date:-2022-01-12 10:55:43