class 12

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Which of the following exists as covalent crystals in the solid state?

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A ray of light along $x+3 y=3 $gets reflected upon reaching x-axis, the equation of the reflected rays is

Two stones are thrown up simultaneously from the edge of the cliff 240 m high with initial speed of 10 m/s and 40 m/s respectively. Which of the following graph best represents the time variation of relative position of the second stone with respect to the first ? (Assume stones do not rebound after hitting the ground and neglect air resistance, take $g=10m/s_{2}$) (The figure are schematic and not drawn to scale)

The vapour pressure of acetone at $20_{∘}C$ is 185 torr. When 1.2 g of a non - volatile substance was dissolved in 100 g of acetone at $20_{∘}C$, its vapour pressure was 183 torr. The molar mass $(gmol_{−1})$ of the substance is :

The sum of first 20 terms of the sequence 0.7, 0.77, 0.777, .. , is

Match List - I (Fundamental Experiment) with List - II (its conclusion) and select the correct option from the choice given below the list :

If $A=⎣⎡ 12a 212 2−2b ⎦⎤ $ is a matrix satisfying the equation $AA_{T}=9I$, where $I$ is $3×3$ identity matrix, then the ordered pair $(a,b)$ is equal to :(A) $(2,−1)$ (B) $(−2,1)$ (C) $(2,1)$ (D) $(−2,−1)$

The amplitude of a damped oscillator decreases to 0.9 times its original magnitude is 5s. In another 10s it will decrease to $α$ times its original magnitude, where $α$ equals.

Which compound would give 5 - keto - 2- methyl hexanal upon ozonolysis ?