HSC Science (General) 11th Standard - Maharashtra State Board Question Bank Solutions

What is the difference between physisorption and chemisorption?

Choose the correct option.

Which of the following is Lewis acid?

What happens when crystalline Na₂CO₃ is heated?

A sample of pure water, whatever the source always contains ______ by mass of oxygen and 11.1% by mass of hydrogen.

Solve problem:

Convert the following degree Celsius temperature to degree Fahrenheit.

40 °C

Convert the following degree Celsius temperature to degree Fahrenheit.

30°C

Choose the correct option:

The number of significant figures in 1.50 × 10⁴ g is __________

Choose the correct option:

In Avogadro’s constant 6.022 × 10²³ mol^-1, the number of significant figures is ________

What do you mean by significant figures?

State the rules for deciding significant figures.

Distinguish between accuracy and precision.

Why there is a need of rounding off figures during calculation?

Why is accurate measurement crucial in science?

Solve the following question:

Round off the following quantity to two significant figures:

25.55 mL

Solve the following question:

Round off the following quantity to two significant figures:

0.00254 m

Solve the following question:

Round off the following quantity to two significant figures:

1.491 × 10⁵ mg

Solve the following question:

Round off the following quantity to two significant figures:

199 g

Solve the following question:

Round off the following quantity to three significant figures:

1.43 cm³

Solve the following question:

Round off the following quantity to three significant figures:

458 × 10² cm

Solve the following question:

Round off the following quantity to three significant figures:

643 cm²