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Chemistry-

General

Easy

Question

Which one of the following hydroxide is insoluble in water?

$C a {(O H)}_{2}$
$B a {(O H)}_{2}$
$B {(O H)}_{2}$
$M g {(O H)}_{2}$

The correct answer is: $B open parentheses O H close parentheses subscript 2 end subscript$

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Which is the incorrect statement?

Which is the incorrect statement?

Chemistry-General

Which salt can be used to identify coloured cation?

Which salt can be used to identify coloured cation?

Chemistry-General

Which will give $N subscript 2 end subscript O$ on heating?

Which will give $N subscript 2 end subscript O$ on heating?

Chemistry-General

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Some of alkali metal salts are coloured. $N a subscript 2 end subscript C r O subscript 4 end subscript minus$ yellow, $K M n O subscript 4 end subscript minus$ pink, $K subscript 2 end subscript M n O subscript 4 end subscript minus$ green. It is due to

Some of alkali metal salts are coloured. $N a subscript 2 end subscript C r O subscript 4 end subscript minus$ yellow, $K M n O subscript 4 end subscript minus$ pink, $K subscript 2 end subscript M n O subscript 4 end subscript minus$ green. It is due to

Chemistry-General

The equation of the hyperbola whose foci are (6, 4) and (–4, 4) and eccentricity 2 is given by

The equation of the hyperbola whose foci are (6, 4) and (–4, 4) and eccentricity 2 is given by

Mg and Li are similar in their properties due to

Mg and Li are similar in their properties due to

Chemistry-General

parallel

When an electron makes a transition from $left parenthesis n plus 1 right parenthesis$ state to $n$ state, the frequency of emitted radiations is related to $n$ according to $left parenthesis n much greater-than 1 right parenthesis$

When an electron makes a transition from $left parenthesis n plus 1 right parenthesis$ state to $n$ state, the frequency of emitted radiations is related to $n$ according to $left parenthesis n much greater-than 1 right parenthesis$

Chemistry-General

The binding energy of an element is 64 Mev. If BE/nucleon is 6.4, then the number of nucleons are

The binding energy of an element is 64 Mev. If BE/nucleon is 6.4, then the number of nucleons are

Chemistry-General

The ionization potential hydrogen atom is $13.6 blank e V$ . The energy required to remove an electron in the $n equals 2$ state of the hydrogen atom is

The ionization potential hydrogen atom is $13.6 blank e V$ . The energy required to remove an electron in the $n equals 2$ state of the hydrogen atom is

Chemistry-General

parallel

In nuclear reaction, $blank subscript 3 end subscript superscript 7 end superscript L i plus blank subscript 1 end subscript superscript 1 end superscript H rightwards arrow 2 blank subscript 2 end subscript superscript 4 end superscript H e$ The mass loss is nearly 0.02 amu. Hence, the energy released (in units of million kcal/mol) in the process is approximately

In nuclear reaction, $blank subscript 3 end subscript superscript 7 end superscript L i plus blank subscript 1 end subscript superscript 1 end superscript H rightwards arrow 2 blank subscript 2 end subscript superscript 4 end superscript H e$ The mass loss is nearly 0.02 amu. Hence, the energy released (in units of million kcal/mol) in the process is approximately

Chemistry-General

There are $0.618 blank mu g blank$ of $blank to the power of 206 end exponent P b$ and $0.238 blank mu g blank$ of $blank to the power of 238 end exponent U$ in a rock. If $T subscript 50 end subscript$ of $blank to the power of 238 end exponent U$ is $1.5 cross times 10 to the power of 9 end exponent y r comma$ age of the rock is

There are $0.618 blank mu g blank$ of $blank to the power of 206 end exponent P b$ and $0.238 blank mu g blank$ of $blank to the power of 238 end exponent U$ in a rock. If $T subscript 50 end subscript$ of $blank to the power of 238 end exponent U$ is $1.5 cross times 10 to the power of 9 end exponent y r comma$ age of the rock is

Chemistry-General

The latus-rectum of the hyperbola $16 x to the power of 2 end exponent minus 9 y to the power of 2 end exponent equals$ $144$ , is

The latus-rectum of the hyperbola $16 x to the power of 2 end exponent minus 9 y to the power of 2 end exponent equals$ $144$ , is

parallel

Let $stack a with rightwards arrow on top equals 2 stack i with hat on top plus stack j with hat on top minus 2 stack k with hat on top$ and $stack b with rightwards arrow on top equals stack i with hat on top plus stack j with hat on top$ . If $stack c with rightwards arrow on top$ is a vector such that $stack a with rightwards arrow on top. stack c with rightwards arrow on top equals open vertical bar stack c with rightwards arrow on top close vertical bar comma open vertical bar stack c with rightwards arrow on top minus stack a with rightwards arrow on top close vertical bar$ = $2 square root of 2$ and the angle between $open parentheses stack a with rightwards arrow on top cross times stack b with rightwards arrow on top close parentheses$ and $stack c with rightwards arrow on top$ is 30⁰, then find the value of $open vertical bar open parentheses stack a with rightwards arrow on top cross times stack b with rightwards arrow on top close parentheses cross times stack c with rightwards arrow on top close vertical bar$ .

Let $stack a with rightwards arrow on top equals 2 stack i with hat on top plus stack j with hat on top minus 2 stack k with hat on top$ and $stack b with rightwards arrow on top equals stack i with hat on top plus stack j with hat on top$ . If $stack c with rightwards arrow on top$ is a vector such that $stack a with rightwards arrow on top. stack c with rightwards arrow on top equals open vertical bar stack c with rightwards arrow on top close vertical bar comma open vertical bar stack c with rightwards arrow on top minus stack a with rightwards arrow on top close vertical bar$ = $2 square root of 2$ and the angle between $open parentheses stack a with rightwards arrow on top cross times stack b with rightwards arrow on top close parentheses$ and $stack c with rightwards arrow on top$ is 30⁰, then find the value of $open vertical bar open parentheses stack a with rightwards arrow on top cross times stack b with rightwards arrow on top close parentheses cross times stack c with rightwards arrow on top close vertical bar$ .

The equation of the line passing through the point (1, -2, 3) and parallel to the line x – y + 2z = 5 and 3x + y + z = 6 is

The equation of the line passing through the point (1, -2, 3) and parallel to the line x – y + 2z = 5 and 3x + y + z = 6 is

If (1 + x + x²)ⁿ = a₀ + a₁x + a₂x² + ………+a_2nx²ⁿ, then the value of the determinant $open vertical bar table row cell a subscript n minus 3 end subscript end cell cell a subscript n minus 1 end subscript end cell cell a subscript n plus 1 end subscript end cell row cell a subscript n minus 6 end subscript end cell cell a subscript n minus 3 end subscript end cell cell a subscript n plus 3 end subscript end cell row cell a subscript n minus 14 end subscript end cell cell a subscript n minus 7 end subscript end cell cell a subscript n plus 7 end subscript end cell end table close vertical bar$ is always

If (1 + x + x²)ⁿ = a₀ + a₁x + a₂x² + ………+a_2nx²ⁿ, then the value of the determinant $open vertical bar table row cell a subscript n minus 3 end subscript end cell cell a subscript n minus 1 end subscript end cell cell a subscript n plus 1 end subscript end cell row cell a subscript n minus 6 end subscript end cell cell a subscript n minus 3 end subscript end cell cell a subscript n plus 3 end subscript end cell row cell a subscript n minus 14 end subscript end cell cell a subscript n minus 7 end subscript end cell cell a subscript n plus 7 end subscript end cell end table close vertical bar$ is always

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