Revision 1

  ..............Element Z of the first transition series can be reduced easily from Z³⁺ to Z²⁺ under normal conditions So element Z is           ………

Sc
Mn
Fe
Tc

To prepare a singly substituted ethane from methane, you follow the scheme . 

heating and rapid quenching⟶ halogenation⟶ hydration
heating and rapid quenching⟶ hydration⟶ hydrohalogenation
heating and rapid quenching⟶ hydration⟶ halogenation
heating and rapid quenching⟶ hydrogenation⟶ hydrohalogenation

The compounds……. and………….. can prove that coinage elements Cu and Au, respectively are transition elements.

a) CuO  , AuCl                b) CuO , AuCl₃         c) Cu₂O , AuCl₃           d) Cu₂O , AuCl

a
b
c
d

The common name for the compound is (CH₃)₃CCl

tert-butyl chloride
secondary butyl chloride
2-methyl-2-chloropropane
2-methyl-2-chloropropane

 If concentration of Barium ion in a saturated solution of BaF₂ equals 3.6×10^-3 M what is the k_sp of this salt

a) 1.9×10^-7                             b) 12.76×10^-7                  c) 1.9×10^-6              d) 12.76×10^-6

a
b
c
d

                                                          ) In two separate galvanic cells, aluminium (Al) is used as the anode in one cell and sodium (Na) is used as the anode in the other. Given that Al and Na have nearly the same atomic mass and that an equal amount of mass of the metals is consumed per unit time, accordingly,

it is unpredictable which cell will produce more current
the Na cell will produce more current
the Al cell will produce more current
neither cell will produce more current than the other

Rusting process occurs in a fast form when the water causing rust contain 

ammonia gas
hydrochloric acid
acetic acid
boric acid

The correct order of processes that are needed to obtain iron di sulpide from iron  di sulfate is …………,…………..and………….

Reaction with sulphur, oxidation, thermal decomposition
Thermal decomposition, reduction, reaction with sulfur
Reduction, reaction with acids, thermal decomposition
Reaction with sulfur, reduction, thermal decomposition

A mixture of two white salts was divided into equal amounts in two test tubes A and B. The addition of dilute HCl to test tube A gives effervescence, and the addition 

of concentrated H₂SO₄ to test tube B gives both effervescence and violet fumes, which turn paper wetted with starch into blue. The chemical formulae of the two salts would be…………. and ………………… 

Na2SO3 , NaCl
Na2CO3 , NaBr
Na2CO3 , NaI
Na2SO3 , NaI

If you know that 0.25 L from benzoic acid solutions contains  1.655 ×10²⁰ ions  what is the pH of solution 

2.59
3.69
2.96
3.93

Which of the following salt on heating with concentrated H₂SO₄, coloured vapours do not evolve

NaBr
NaNO3
CaF2
KI

Consider the equilibrium system  : HCN_(aq) + H₂O_(l)                      H₃O ⁺ _(aq) + CN^– _(aq)   ?? = 4.9 × 10⁻¹⁰

On adding few drops of HCl_(aq) to the equilibrium system, the value of ?? would . 

decrease greatly
decrease slightly
remain constant
increase

The number of methylene groups that exist in 2-pentyne is ………….

0
1
2
3

Which of the following is correct about the compound having the molecular formula C₇H₁₆ 

It is an aromatic hydrocarbon
It is a saturated open chain aliphatic hydrocarbon
It is an unsaturated open chain aliphatic hydrocarbon
It is a saturated cyclic aliphatic hydrocarbon.

A reaction occurs between 2 reactants, which are ……….. and ………., and their colours change after the reaction without forming a precipitate or evolving any gas.

iron metal, water
diluted hydrochloric acid, iron metal
diluted hydrochloric acid, iron(II) oxide
iron(III) oxide, carbon monoxide

All the of the following Alkynes are symmetric alkynes except..

C2H5C≡CH
C2H5C≡CCH3
CH3C≡CCH3

If 3 mol of bromine dissolved in carbon tetrachloride reacts with 1.5 mol of a hydrocarbon compound. What is the formula of the produced compound

CnH2nBr6
CnH2n-2Br4
CnH2nBr3
CnH2n-2Br6

The number of methyl groups in the unsaturated hydrocarbon ethyl butene is 

3
4
2
1

The compound which reacts by substitution and don’t react by addition is

C6H6
CH4
C2H2
C2H4

In cold countries ethylene glycol is added to water in car radiators. This helps to

Make water a better lubricant
Lower the freezing point
Reduce the viscosity
Lower the boiling point

Cyclobutane reacts with hydrogen in the presence of nickel catalyst at 200°C to give

a
b
c
d

Which of following statements is false about propane

Each carbon is sp3 hybridized
All bond angles are 109.5°
The compound is combustible
The compound undergoes polymerization to give polypropylene

What is the IUPAC name of : (CH₃)₃CCH₂CH(CH₃)₂

a) 1,1,3,3 – tetramethyl butane                    b) 2,2,24,4 - tetramethyl butane

c) 2,4,4 - trimethyl pentane                       d) 2,2,4 - trimethyl pentane

a
b
c
d

a
b
c
d

In Mercury cell and fuel cell which of the following is correct

Oxidation for oxygen ions takes place in Mercury cell
Reduction for oxygen ions takes place in Fuel cell
Neither oxidation nor reduction takes place for oxygen ions in mercury cell
Oxidation for oxygen ions takes place in Fuel cell

The number of hydrogen moles required to change 1 mol of di phenyl acetylene into saturated compound equals:

4mol
8mol
3mol
2mol

When the sublevel of zinc is 3dⁿ so the alloy of iron with is stronger than steel

a. 3d^n-5                 b. 3d^n-6           c. 3d^n-7                     d. 3d^n-8

a
b
c
d

Sample of sodium chloride contains 50% impurities adding to it solution of silver nitrate and forming 8.5 g of silver precipitate 
3.46g
6.93g
7.5g
3.9g

Its pH is high.
It is a strong acid.
It is a weak acid
Its Kb is high.

 

 

a)      9 h              b) 35.74 h                c) 18.1 h           d) 4.5 h

a
b
c
d