Alkaline earth metals include :
1.Group 1 element
2.Group 2 element
3.Group 18 element
4.Group 17 element
Arrange the following as per instruction given in the brackets K, CI, Na, S, Si (increasing order of atomic size)
1. K<Na < Si < S < CI
2.K< Na < Si < CI <S
3.Na < S< Cl < K < Si
Brine is an:
1.aqueous solution of sodium hydroxide
2.aqueous solution of sodium carbonate
3.aqueous solution of sodium chloride
4.aqueous solution of sodium bicarbonate
Covalent bond is formed between :
1.Metal and non-metal
4.Non-metal and an ion
1.Sodium chloride solution
2.Dilute hydrochloric acid
3.Dilute sulphuric acid
4.Aqueous acetic acid
If two compounds have the same empirical formula but different molecular formulae, they must have :
1. different percentage composition.
2.different molecular mass.
4.same vapour density.
In terms of acidic strength, which one of the following is in the correct increasing order?
1.Water< Acetic acid < Hydrochloric acid
2.Water<Hydrochloric acid < Acetic acid
3.Acetic acid < Water < Hydrochloric acid
4.Hydrochloric acid < Water <Acetic acid
1.Water <Hydrochloric acid < Acetic acid
2.Water< Acetic acid < Hydrochloric acid
3.Acetic acid < water < Hydrochloric acid
4.Water< Acetic acid < Hydrochloric acid
Methyi orange is
1.Pink in acidic medium, yellow in basic medium
2.Yellow in acidic medium, pink in basic medium
3.Colourless in acidic medium, pink in basic medium
4.Pink in acidic medium colourless in basic medium
Name the reagent from the following which can be used to distinguish zine nitrate solution from magnesium nitrate
The formula which expresses the actual number of each kind of atom present in the molecule of a compound is called:
2. Molecular Formula
4.None of these
The formula which gives the simple ratio of each kind of atoms present in the molecule of a compound is called :
3. Structural Formula
4.None of these
The metallic electrode which does not take part in an electrolytic reaction? (Inert electrode)
The one which is composed of all the three kinds of bond (ionic; covalent and coordinate bond) is:
3.ions and molecules
The precipitate of which of the following compounds is soluble in excess of ammonia solution?
The type of bonding in HCl molecule is :
1.Polar covalent bond
What happens when a solution of an acid is mixed with a solution of a base in a test tube?
1.Temperature of the solution decreases.
2.Temperature of the solution increases.
3.Temperature of the solution remains the same
4.None of the above
3. Empirical mass
4.Molecular mass 3. Empirical mass
1.Zinc hydroxide and sodium
2.Sodium zincate and hydrogen gas
3.Sodium Zinc oxide and hydrogen gas
4.Sodium zincate and water
4.None of these
When dilute sodium chloride is electrolysed using graphite electrodes, which cation is discharged at the cathode most readily?
When two compounds R and S have same percentage composition. Then the compounds R and S are:
3.either identical or isomer
4.All are correct
Which is the most electronegative?
1.Liquid carbon tetrachloride
3.Sodium hydroxide aqueos solution
4.Potassium chloride aqueous solution
Which one of the following salt solutions on reaction with excess of ammonium hydroxide solution results finally in dissolution of the precipitate first formed ?
Which one of the following salt solutions on reaction with excess sodium hydroxide solution gives a clear solution finally ?
1.To increase their atomic numbers
2. To attain a noble-gas electron configuration
3. To become more polar
4.To become ions and attract each other