37275
Which of the following imparts green colour to the burner flame
1 \(B{(OMe)_3}\)
2 \(Na(OMe)\)
3 \(Al{(O\Pr )_3}\)
4 \(Sn{(OH)_2}\)
Explanation:
\(\because\) The vapouss of trialkyl borates \(B(O R)_3\) or \(R_3 BO_3\) burn with green edged flame. This is a qualitative test of borates. \(2 BO _3^{-}+3 H _2 SO _4 \rightarrow 3 SO _4^{2-}+2 H _3 BO _3\) \(H _3 BO _3+3 ROH \rightarrow R _3 BO _3+3 H _2 O\)
PRACTICAL CHEMISTRY
37276
In laboratory burners, we use
1 Producer gas
2 Oil gas
3 Gobar gas
4 Coal gas
Explanation:
(b)In laboratory burners, oil gas is generally used. Oil gas is mixture of \(C{H_4} + CO + C{O_2} + {H_2}\)
PRACTICAL CHEMISTRY
37277
A colourless gas with the smell of rotten fish is
1 \({H_2}S\)
2 \(P{H_3}\)
3 \(S{O_2}\)
4 None of these
Explanation:
(b) \({H_2}S \to \) colourless gas with unpleasant odour of rotten eggs. \(S{O_2} \to \) colourless gas with a pungent suffocating odour \(P{H_3} \to \) colourless gas with unpleasant garlic like odour or rotten fish odour.
37275
Which of the following imparts green colour to the burner flame
1 \(B{(OMe)_3}\)
2 \(Na(OMe)\)
3 \(Al{(O\Pr )_3}\)
4 \(Sn{(OH)_2}\)
Explanation:
\(\because\) The vapouss of trialkyl borates \(B(O R)_3\) or \(R_3 BO_3\) burn with green edged flame. This is a qualitative test of borates. \(2 BO _3^{-}+3 H _2 SO _4 \rightarrow 3 SO _4^{2-}+2 H _3 BO _3\) \(H _3 BO _3+3 ROH \rightarrow R _3 BO _3+3 H _2 O\)
PRACTICAL CHEMISTRY
37276
In laboratory burners, we use
1 Producer gas
2 Oil gas
3 Gobar gas
4 Coal gas
Explanation:
(b)In laboratory burners, oil gas is generally used. Oil gas is mixture of \(C{H_4} + CO + C{O_2} + {H_2}\)
PRACTICAL CHEMISTRY
37277
A colourless gas with the smell of rotten fish is
1 \({H_2}S\)
2 \(P{H_3}\)
3 \(S{O_2}\)
4 None of these
Explanation:
(b) \({H_2}S \to \) colourless gas with unpleasant odour of rotten eggs. \(S{O_2} \to \) colourless gas with a pungent suffocating odour \(P{H_3} \to \) colourless gas with unpleasant garlic like odour or rotten fish odour.
37275
Which of the following imparts green colour to the burner flame
1 \(B{(OMe)_3}\)
2 \(Na(OMe)\)
3 \(Al{(O\Pr )_3}\)
4 \(Sn{(OH)_2}\)
Explanation:
\(\because\) The vapouss of trialkyl borates \(B(O R)_3\) or \(R_3 BO_3\) burn with green edged flame. This is a qualitative test of borates. \(2 BO _3^{-}+3 H _2 SO _4 \rightarrow 3 SO _4^{2-}+2 H _3 BO _3\) \(H _3 BO _3+3 ROH \rightarrow R _3 BO _3+3 H _2 O\)
PRACTICAL CHEMISTRY
37276
In laboratory burners, we use
1 Producer gas
2 Oil gas
3 Gobar gas
4 Coal gas
Explanation:
(b)In laboratory burners, oil gas is generally used. Oil gas is mixture of \(C{H_4} + CO + C{O_2} + {H_2}\)
PRACTICAL CHEMISTRY
37277
A colourless gas with the smell of rotten fish is
1 \({H_2}S\)
2 \(P{H_3}\)
3 \(S{O_2}\)
4 None of these
Explanation:
(b) \({H_2}S \to \) colourless gas with unpleasant odour of rotten eggs. \(S{O_2} \to \) colourless gas with a pungent suffocating odour \(P{H_3} \to \) colourless gas with unpleasant garlic like odour or rotten fish odour.
37275
Which of the following imparts green colour to the burner flame
1 \(B{(OMe)_3}\)
2 \(Na(OMe)\)
3 \(Al{(O\Pr )_3}\)
4 \(Sn{(OH)_2}\)
Explanation:
\(\because\) The vapouss of trialkyl borates \(B(O R)_3\) or \(R_3 BO_3\) burn with green edged flame. This is a qualitative test of borates. \(2 BO _3^{-}+3 H _2 SO _4 \rightarrow 3 SO _4^{2-}+2 H _3 BO _3\) \(H _3 BO _3+3 ROH \rightarrow R _3 BO _3+3 H _2 O\)
PRACTICAL CHEMISTRY
37276
In laboratory burners, we use
1 Producer gas
2 Oil gas
3 Gobar gas
4 Coal gas
Explanation:
(b)In laboratory burners, oil gas is generally used. Oil gas is mixture of \(C{H_4} + CO + C{O_2} + {H_2}\)
PRACTICAL CHEMISTRY
37277
A colourless gas with the smell of rotten fish is
1 \({H_2}S\)
2 \(P{H_3}\)
3 \(S{O_2}\)
4 None of these
Explanation:
(b) \({H_2}S \to \) colourless gas with unpleasant odour of rotten eggs. \(S{O_2} \to \) colourless gas with a pungent suffocating odour \(P{H_3} \to \) colourless gas with unpleasant garlic like odour or rotten fish odour.