s-Block Elements
227 Questions
1994
JEE Advanced
Numerical
IIT-JEE 1994
Complete and balance the following reactions:
Ca5(PO4)3F + H2SO4 + H2O $\buildrel {Heat} \over \longrightarrow $ ........ + 5CaSO4.2H2O + ........
Ca5(PO4)3F + H2SO4 + H2O $\buildrel {Heat} \over \longrightarrow $ ........ + 5CaSO4.2H2O + ........
Correct Answer: Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>F + 5H<sub>2</sub>SO<sub>4</sub> + 10H<sub>2</sub>O $$\buildrel {Heat} \over
\longrightarrow $$ 3H<sub>3</sub>PO<sub>4</sub> + 5CaSO<sub>4</sub>.2H<sub>2</sub>O + HF
1993
JEE Advanced
Numerical
IIT-JEE 1993
Ca2+ has a small ionic radius than K+ because it has ______.
Correct Answer: higher effective nuclear charge
1992
JEE Advanced
MSQ
IIT-JEE 1992
The species that do not contain peroxide ions are
A.
PbO2
B.
H2O2
C.
SrO2
D.
BaO2
1991
JEE Advanced
Numerical
IIT-JEE 1991
Write down the balanced equation for the reaction when:
Carbon dioxide is passed through a suspension of lime stone in water.
Carbon dioxide is passed through a suspension of lime stone in water.
Correct Answer: Solve by yourself.
1990
JEE Advanced
MSQ
IIT-JEE 1990
When zeolite, which is hydrated sodium aluminium silicate is treated with hard water the sodium ions are exchanged with
A.
H+ ions
B.
Ca++ ions
C.
$SO_4^{--}$ ions
D.
Mg++ ions
1989
JEE Advanced
Numerical
IIT-JEE 1989
Write down the balanced equation for the reaction when:
Potassium ferricyanide reacts with hydrogen peroxide in basic solution
Potassium ferricyanide reacts with hydrogen peroxide in basic solution
Correct Answer: Solve by yourself
1989
JEE Advanced
Numerical
IIT-JEE 1989
The electrolysis of molten sodium hydride liberates ____ gas at the _____
Correct Answer: hydrogen, anode
1988
JEE Advanced
Numerical
IIT-JEE 1988
Write down the balanced equation for the reaction when:
Carbon dioxide is passed through a concentrated aqueous solution of sodium chloride saturated with ammonia.
Carbon dioxide is passed through a concentrated aqueous solution of sodium chloride saturated with ammonia.
Correct Answer: Solve by yourself
1987
JEE Advanced
MCQ
IIT-JEE 1987
The metallic lustre exhibited by sodium is explained by
A.
diffusion of sodium ions
B.
oscillation of loose electrons
C.
excitation of free protons
D.
existence of body centered cubic lattice
1987
JEE Advanced
Numerical
IIT-JEE 1987
Give reasons of the following :
Magnesium oxide is used for the lining of steel making furnace.
Magnesium oxide is used for the lining of steel making furnace.
Correct Answer: Do by yourself
1987
JEE Advanced
MCQ
IIT-JEE 1987
Sodium when burnt in excess of oxygen gives sodium oxide.
A.
TRUE
B.
FALSE
1986
JEE Advanced
MCQ
IIT-JEE 1986
The pair of compound which cannot exist together in solution is:
A.
NaHCO3 and NaOH
B.
Na2CO3 and NaHCO3
C.
Na2CO3 and NaOH
D.
NaHCO3 and NaCl
1986
JEE Advanced
MCQ
IIT-JEE 1986
The softness of group I-A metals increases down the group with increasing atomic number.
A.
TRUE
B.
FALSE
1985
JEE Advanced
MCQ
IIT-JEE 1985
The oxide that gives hydrogen peroxide on treatment with a dilute acid is
A.
PbO2
B.
Na2O2
C.
MnO2
D.
TiO2
1985
JEE Advanced
MCQ
IIT-JEE 1985
Molecular formula of Glauber's salt is:
A.
MgSO4.7H2O
B.
CuSO4.5H2O
C.
FeSO4.7H2O
D.
Na2SO4.10H2O
1985
JEE Advanced
Numerical
IIT-JEE 1985
Write down the balanced equations for the reaction when:
Calcium phosphate is heated with a mixture of sand and carbon;
Calcium phosphate is heated with a mixture of sand and carbon;
Correct Answer: Solve by yourself
1985
JEE Advanced
Numerical
IIT-JEE 1985
Sodium dissolved in liquid ammonia conducts electricity because ________.
Correct Answer: of solvated electrons
1984
JEE Advanced
MCQ
IIT-JEE 1984
The hydration energy of Mg++ is larger than that of:
A.
Al3+
B.
Na+
C.
Be++
D.
Mg3+
1982
JEE Advanced
Numerical
IIT-JEE 1982
How will you prepare bleaching powder from slaked lime.
Correct Answer: Solve by yourself
1982
JEE Advanced
Numerical
IIT-JEE 1982
Write down the balanced equations for the reaction when:
An alkaline solution of potassium ferricyanide is reacted with hydrogen peroxide.
An alkaline solution of potassium ferricyanide is reacted with hydrogen peroxide.
Correct Answer: Solve by yourself
1982
JEE Advanced
MCQ
IIT-JEE 1982
MgCl2.6H2O on heating give anhydrous MgCl2
A.
TRUE
B.
FALSE
1981
JEE Advanced
MCQ
IIT-JEE 1981
A solution of sodium metal in liquid ammonia is strongly reducing due to the presence of
A.
sodium atoms
B.
sodium hydride
C.
sodium amide
D.
solvated electrons
1981
JEE Advanced
Numerical
IIT-JEE 1981
Give reasons of the following:
Sodium carbonate is made by Solvay process but the same process is not extended to the manufacture of potassium carbonate.
Sodium carbonate is made by Solvay process but the same process is not extended to the manufacture of potassium carbonate.
Correct Answer: Do by yourself
1980
JEE Advanced
MCQ
IIT-JEE 1980
Calcium is obtained by
A.
electrolysis of molten CaCl2
B.
electrolysis of solution CaCl2 in water
C.
Reduction of CaCl2 with carbon
D.
roasting of limestone
1980
JEE Advanced
MCQ
IIT-JEE 1980
HCL is added to the following oxides. Which one would give H2O2?
A.
MnO2
B.
PbO2
C.
BaO2.8H2O
D.
NO2
1980
JEE Advanced
Numerical
IIT-JEE 1980
Anhydrous MgCl2 is obtained by hydrated salt with ______.
Correct Answer: Anhydrous HCl
1978
JEE Advanced
MCQ
IIT-JEE 1978
The substance absorbs CO2 and violently reacts with water. The substance is
A.
CaCO3
B.
CaO
C.
H2SO4
D.
ZnO