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PRACTICAL CHEMISTRY

37265 Which one of the following metals will give blue ash when its salt is heated with $N a_{2} C O_{3}$ solid and $C o {(N O_{3})}_{2}$ on a charcoal piece

1

C u

2

M g

3

A l

4

Z n

Explanation:

(c) $C o A l O_{2}$ is formed which is blue. Follow cobalt nitrate-charcoal test.

PRACTICAL CHEMISTRY

37266 The metal that does not give the borax bead test is

1

C r

2

N i

3

N a

4

M n

PRACTICAL CHEMISTRY

37267 When concentrated $H_{2} S O_{4}$ is added to dry $K N O_{3}$ , brown fumes evolve. These fumes are

1

S O_{2}

2

S O_{3}

3

N O

4

N O_{2}

Explanation:

(d) $2 K N O_{3} + H_{2} S O_{4} \to 2 K H S O_{4} + \underset{(B r o w n g a s)}{2 N O_{2} ↑}$

PRACTICAL CHEMISTRY

37268 Which one of the following salt give green coloured flame when the salt is tested by $P t$ wire

1 Barium salt

2 Calcium salt

3 Borate

4 Lead salt

PRACTICAL CHEMISTRY

37265 Which one of the following metals will give blue ash when its salt is heated with $N a_{2} C O_{3}$ solid and $C o {(N O_{3})}_{2}$ on a charcoal piece

1

C u

2

M g

3

A l

4

Z n

Explanation:

(c) $C o A l O_{2}$ is formed which is blue. Follow cobalt nitrate-charcoal test.

PRACTICAL CHEMISTRY

37266 The metal that does not give the borax bead test is

1

C r

2

N i

3

N a

4

M n

PRACTICAL CHEMISTRY

37267 When concentrated $H_{2} S O_{4}$ is added to dry $K N O_{3}$ , brown fumes evolve. These fumes are

1

S O_{2}

2

S O_{3}

3

N O

4

N O_{2}

Explanation:

(d) $2 K N O_{3} + H_{2} S O_{4} \to 2 K H S O_{4} + \underset{(B r o w n g a s)}{2 N O_{2} ↑}$

PRACTICAL CHEMISTRY

37268 Which one of the following salt give green coloured flame when the salt is tested by $P t$ wire

1 Barium salt

2 Calcium salt

3 Borate

4 Lead salt

PRACTICAL CHEMISTRY

37265 Which one of the following metals will give blue ash when its salt is heated with $N a_{2} C O_{3}$ solid and $C o {(N O_{3})}_{2}$ on a charcoal piece

1

C u

2

M g

3

A l

4

Z n

Explanation:

(c) $C o A l O_{2}$ is formed which is blue. Follow cobalt nitrate-charcoal test.

PRACTICAL CHEMISTRY

37266 The metal that does not give the borax bead test is

1

C r

2

N i

3

N a

4

M n

PRACTICAL CHEMISTRY

37267 When concentrated $H_{2} S O_{4}$ is added to dry $K N O_{3}$ , brown fumes evolve. These fumes are

1

S O_{2}

2

S O_{3}

3

N O

4

N O_{2}

Explanation:

(d) $2 K N O_{3} + H_{2} S O_{4} \to 2 K H S O_{4} + \underset{(B r o w n g a s)}{2 N O_{2} ↑}$

PRACTICAL CHEMISTRY

37268 Which one of the following salt give green coloured flame when the salt is tested by $P t$ wire

1 Barium salt

2 Calcium salt

3 Borate

4 Lead salt

PRACTICAL CHEMISTRY

37265 Which one of the following metals will give blue ash when its salt is heated with $N a_{2} C O_{3}$ solid and $C o {(N O_{3})}_{2}$ on a charcoal piece

1

C u

2

M g

3

A l

4

Z n

Explanation:

(c) $C o A l O_{2}$ is formed which is blue. Follow cobalt nitrate-charcoal test.

PRACTICAL CHEMISTRY

37266 The metal that does not give the borax bead test is

1

C r

2

N i

3

N a

4

M n

PRACTICAL CHEMISTRY

37267 When concentrated $H_{2} S O_{4}$ is added to dry $K N O_{3}$ , brown fumes evolve. These fumes are

1

S O_{2}

2

S O_{3}

3

N O

4

N O_{2}

Explanation:

(d) $2 K N O_{3} + H_{2} S O_{4} \to 2 K H S O_{4} + \underset{(B r o w n g a s)}{2 N O_{2} ↑}$

PRACTICAL CHEMISTRY

37268 Which one of the following salt give green coloured flame when the salt is tested by $P t$ wire

1 Barium salt

2 Calcium salt

3 Borate

4 Lead salt

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