Extraction of Calcium

Q. On electrolysis of aqueous $NaCl$ solution using platinum $\left(Pt\right)$ electrodes, the product obtained at anode will be

1. Hydrogen gas
2. Oxygen gas
3. Chlorine gas
4. Ozone gas

Q. On electrolysis of dilute copper sulphate solution using platinum electrodes, the products obtained at cathode and anode respectively are:

1. H₂ and O₂
2. Cu and O₂
3. H₂ and SO₂
4. O₂ and H₂

Q. The metal X is prepared by the electrolysis of fused chloride. It reacts with hydrogen to form colourless solid from which hydrogen is released on treatment with water. The metal is :

1. Cu
2. Al
3. Zn
4. Ca

Q. $CaC{O}_3$ is $90$% pure. Volume of $C{O}_2$ collected at STP when $10g$ of $CaC{O}_3$ is decomposed is:

1. $2.016litres$
2. $1.008litres$
3. $10.08litres$
4. $20.16litres$

Q.

Calcium is obtained by

1. Electrolysis of molten $CaC{l}_2$

2. Electrolysis of solution of $CaC{l}_2$ in water

3. Reduction of $CaC{l}_2$ with carbon

4. Roasting of limestone

Q.

$Ca+O\to \underset{–}{A}$

$Ca+N_2\to \underset{–}{B}$. A & B are

1. $CaO,C{a}_3{N}_2$
2. $Ca{O}_2,C{a}_3{N}_2$
3. $CaO,Ca{N}_2$
4. $CaO,Ca{N}_3$

Q. $x$ gm of $CaC{O}_3$ was completely burnt in air. The weight of the solid residue formed is 28 g. What is the value of $x$ in grams?

1. 200
2. 50
3. 44
4. 150

Q.

$Ca+O\to \underset{–}{A}$

$Ca+N_2\to \underset{–}{B}$. A & B are

1. $CaO,C{a}_3{N}_2$
2. $Ca{O}_2,C{a}_3{N}_2$
3. $CaO,Ca{N}_2$
4. $CaO,Ca{N}_3$

Q.

$Ca+O\to \underset{–}{A}$

$Ca+N_2\to \underset{–}{B}$. A & B are

1. CaO, Ca₃ N₂

2. CaO₂, Ca₃N₂

3. CaO, CaN₂

4. CaO, CaN₃

Q.

$Ca+O\to \underset{–}{A}$

$Ca+N_2\to \underset{–}{B}$. A & B are

1. $CaO,C{a}_3{N}_2$
2. $Ca{O}_2,C{a}_3{N}_2$
3. $CaO,Ca{N}_2$
4. $CaO,Ca{N}_3$

Q. A substance ${}^{\prime }{A}^{\prime }$ decomposes by a first order reaction starting initially with $\left[A\right]=2.00M$ and after $200min\left[A\right]=0.15M$. For this reaction what is the value of $k$ ?

1. $3.29\times {10}^{-2}mi{n}^{-1}$
2. $4.40\times {10}^{-2}mi{n}^{-1}$
3. $1.29\times {10}^{-2}mi{n}^{-1}$
4. $2.29\times {10}^{-2}mi{n}^{-1}$

Q. Which statement is true about $n/p$ ratio?

1. It increases by $\beta$-emission
2. None of the above
3. It increases by $\alpha$-emission
4. It increases by $\gamma$-emission

Q.

Calcium is obtained by

1. Electrolysis of molten $CaC{l}_2$

2. Electrolysis of solution of $CaC{l}_2$ in water

3. Reduction of $CaC{l}_2$ with carbon

4. Roasting of limestone

Q.

Calcium is obtained by

1. Electrolysis of molten $CaC{l}_2$

2. Electrolysis of solution of $CaC{l}_2$ in water

3. Reduction of $CaC{l}_2$ with carbon

4. Roasting of limestone

Q.

Calcium is obtained by

1. Electrolysis of molten $CaC{l}_2$

2. Electrolysis of solution of $CaC{l}_2$ in water

3. Reduction of $CaC{l}_2$ with carbon

4. Roasting of limestone