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Chemistry-

General

Easy

Question

Hydrogen is not obtained when zinc reacts with

Cold water
Hot $N a O H$ solution
Conc. sulphuric acid
dilute $H C l$

The correct answer is: Conc. sulphuric acid

$Z n plus H subscript 2 end subscript O rightwards arrow Z n O plus H subscript 2 end subscript$
$Z n plus 2 N a O H rightwards arrow N a subscript 2 end subscript Z n O subscript 2 end subscript plus H subscript 2 end subscript$
$Z n plus 2 H C l rightwards arrow Z n C l subscript 2 end subscript plus H subscript 2 end subscript$
$Z n plus 2 H subscript 2 end subscript S O subscript 4 end subscript rightwards arrow Z n S O subscript 4 end subscript plus S O subscript 2 end subscript plus 2 H subscript 2 end subscript O$

Related Questions to study

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parallel

The Gravitational P.E of a body of mas m at the earth's surface is -mg Re. Its gravitational potential energy at a height Re from the earth's surface will be = here (Re is the radius of the earth),

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parallel

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The masses and radius of earth and moon are M₁ ,R₁and M₂ R₂respectively. Their centres are d distance of apart. The minimum velocity with which a particle of mass should be projected from a point mid way between their centres so that it escapes to infinity is……

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If P= $fraction numerator A to the power of 2 end exponent B over denominator C to the power of 3 end exponent end fraction$ where percentage error in $A comma B$ and $C$ are respectively $plus 2 percent sign plus-or-minus 3 percent sign$ and $plus-or-minus 5 percent sign$ then total percentage error in measurement of $p$

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physics-General

The mass of the earth is 6.00 $cross times 10 to the power of 24$ Kg and that of the moon is 7.40 $cross times 10 to the power of 22$ kg. The constant of gravitation G=6.667 $cross times 10 negative 11 to the power of blank$ Nm^-2 kg^--2.The potential energy of the system is -7.79 $cross times 10 to the power of 28$ Joules. the mean distance between the earth and moon is =

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$text If end text a with not stretchy bar on top equals ı with not stretchy bar on top plus 2 ȷ with not stretchy bar on top plus 3 k with not stretchy bar on top comma b with not stretchy bar on top equals negative ı with not stretchy bar on top plus 2 ȷ with not stretchy bar on top plus k with not stretchy bar on top comma c with not stretchy bar on top equals 3 ı with not stretchy bar on top plus ȷ with not stretchy bar on top text and end text a with not stretchy bar on top plus t b with not stretchy bar on top$ is perpendicular to $stack c with ‾ on top$ , then $t equals$

For this question, we should know the rules of dot product.

$text If end text a with not stretchy bar on top equals ı with not stretchy bar on top plus 2 ȷ with not stretchy bar on top plus 3 k with not stretchy bar on top comma b with not stretchy bar on top equals negative ı with not stretchy bar on top plus 2 ȷ with not stretchy bar on top plus k with not stretchy bar on top comma c with not stretchy bar on top equals 3 ı with not stretchy bar on top plus ȷ with not stretchy bar on top text and end text a with not stretchy bar on top plus t b with not stretchy bar on top$ is perpendicular to $stack c with ‾ on top$ , then $t equals$

For this question, we should know the rules of dot product.

parallel

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